---
_id: '11711'
abstract:
- lang: eng
text: Codes and data for reproducing the results of N. B. Budanur and B. Hof "An
autonomous compartmental model for accelerating epidemics"
article_processing_charge: No
author:
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
citation:
ama: Budanur NB. burakbudanur/autoacc-public. 2022. doi:10.5281/ZENODO.6802720
apa: Budanur, N. B. (2022). burakbudanur/autoacc-public. Zenodo. https://doi.org/10.5281/ZENODO.6802720
chicago: Budanur, Nazmi B. “Burakbudanur/Autoacc-Public.” Zenodo, 2022. https://doi.org/10.5281/ZENODO.6802720.
ieee: N. B. Budanur, “burakbudanur/autoacc-public.” Zenodo, 2022.
ista: Budanur NB. 2022. burakbudanur/autoacc-public, Zenodo, 10.5281/ZENODO.6802720.
mla: Budanur, Nazmi B. Burakbudanur/Autoacc-Public. Zenodo, 2022, doi:10.5281/ZENODO.6802720.
short: N.B. Budanur, (2022).
date_created: 2022-08-01T08:06:33Z
date_published: 2022-07-06T00:00:00Z
date_updated: 2023-08-03T12:24:21Z
day: '06'
ddc:
- '000'
department:
- _id: BjHo
doi: 10.5281/ZENODO.6802720
has_accepted_license: '1'
main_file_link:
- open_access: '1'
url: https://doi.org/10.5281/ZENODO.6802720
month: '07'
oa: 1
oa_version: Published Version
publisher: Zenodo
related_material:
record:
- id: '11704'
relation: used_in_publication
status: public
status: public
title: burakbudanur/autoacc-public
tmp:
image: /images/cc_0.png
legal_code_url: https://creativecommons.org/publicdomain/zero/1.0/legalcode
name: Creative Commons Public Domain Dedication (CC0 1.0)
short: CC0 (1.0)
type: research_data_reference
user_id: 6785fbc1-c503-11eb-8a32-93094b40e1cf
year: '2022'
...
---
_id: '10820'
abstract:
- lang: eng
text: Streaky structures in the boundary layers are often generated by surface roughness
elements and/or free-stream turbulence, and are known to have significant effects
on boundary-layer instability. In this paper, we investigate the impact of two
forms of streaks on the instability of supersonic boundary layers. The first concerns
the streaks generated by an array of spanwise periodic and streamwise elongated
surface roughness elements, and our interest is how these streaks influence the
lower-branch viscous first modes, whose characteristic wavelength and frequency
are on the classical triple-deck scales. By adapting the triple-deck theory in
the incompressible regime to the supersonic one, we first derived a simplified
system which allows for efficient calculation of the streaks. The asymptotic analysis
simplifies a bi-global eigenvalue problem to a one-dimensional problem in the
spanwise direction, showing that the instability is controlled at leading order
solely by the spanwise-dependent wall shear. In the fundamental configuration,
the streaks stabilize first modes at low frequencies but destabilize the high-frequency
ones. In the subharmonic configuration, the streaks generally destabilize the
first mode across the entire frequency band. Importantly, the spanwise even modes
are of radiating nature, i.e. they emit acoustic waves spontaneously to the far
field. Streaks of the second form are generated by low-frequency vortical disturbances
representing free-stream turbulence. They alter the flow in the entire layer and
their effects on instability are investigated by solving the inviscid bi-global
eigenvalue problem. Different from the incompressible case, a multitude of compressible
instability modes exists, of which the dominant mode is an inviscid instability
associated with the spanwise shear. In addition, there exists a separate branch
of instability modes that have smaller growth rates but are spontaneously radiating.
acknowledgement: The work is supported by the National Key Research and Development
Program of China (No. 2016YFA0401200), the National Natural Science Foundation of
China (Grant Nos. 91952202 and 11402167).
article_processing_charge: No
author:
- first_name: Jianxin
full_name: Liu, Jianxin
last_name: Liu
- first_name: Elena
full_name: Marensi, Elena
id: 0BE7553A-1004-11EA-B805-18983DDC885E
last_name: Marensi
- first_name: Xuesong
full_name: Wu, Xuesong
last_name: Wu
citation:
ama: 'Liu J, Marensi E, Wu X. Effects of streaky structures on the instability of
supersonic boundary layers. In: Sherwin S, Schmid P, Wu X, eds. IUTAM Laminar-Turbulent
Transition. Vol 38. 1st ed. IUTAM Bookseries. Cham: Springer Nature; 2022:587-598.
doi:10.1007/978-3-030-67902-6_51'
apa: 'Liu, J., Marensi, E., & Wu, X. (2022). Effects of streaky structures on
the instability of supersonic boundary layers. In S. Sherwin, P. Schmid, &
X. Wu (Eds.), IUTAM Laminar-Turbulent Transition (1st ed., Vol. 38, pp.
587–598). Cham: Springer Nature. https://doi.org/10.1007/978-3-030-67902-6_51'
chicago: 'Liu, Jianxin, Elena Marensi, and Xuesong Wu. “Effects of Streaky Structures
on the Instability of Supersonic Boundary Layers.” In IUTAM Laminar-Turbulent
Transition, edited by Spencer Sherwin, Peter Schmid, and Xuesong Wu, 1st ed.,
38:587–98. IUTAM Bookseries. Cham: Springer Nature, 2022. https://doi.org/10.1007/978-3-030-67902-6_51.'
ieee: 'J. Liu, E. Marensi, and X. Wu, “Effects of streaky structures on the instability
of supersonic boundary layers,” in IUTAM Laminar-Turbulent Transition,
1st ed., vol. 38, S. Sherwin, P. Schmid, and X. Wu, Eds. Cham: Springer Nature,
2022, pp. 587–598.'
ista: 'Liu J, Marensi E, Wu X. 2022.Effects of streaky structures on the instability
of supersonic boundary layers. In: IUTAM Laminar-Turbulent Transition. vol. 38,
587–598.'
mla: Liu, Jianxin, et al. “Effects of Streaky Structures on the Instability of Supersonic
Boundary Layers.” IUTAM Laminar-Turbulent Transition, edited by Spencer
Sherwin et al., 1st ed., vol. 38, Springer Nature, 2022, pp. 587–98, doi:10.1007/978-3-030-67902-6_51.
short: J. Liu, E. Marensi, X. Wu, in:, S. Sherwin, P. Schmid, X. Wu (Eds.), IUTAM
Laminar-Turbulent Transition, 1st ed., Springer Nature, Cham, 2022, pp. 587–598.
conference:
end_date: 2019-09-06
location: London, United Kingdom
name: IUTAM Symposium
start_date: 2019-09-02
date_created: 2022-03-04T09:14:34Z
date_published: 2022-01-01T00:00:00Z
date_updated: 2023-08-03T12:54:59Z
day: '01'
department:
- _id: BjHo
doi: 10.1007/978-3-030-67902-6_51
edition: '1'
editor:
- first_name: Spencer
full_name: Sherwin, Spencer
last_name: Sherwin
- first_name: Peter
full_name: Schmid, Peter
last_name: Schmid
- first_name: Xuesong
full_name: Wu, Xuesong
last_name: Wu
external_id:
isi:
- '000709087600051'
intvolume: ' 38'
isi: 1
language:
- iso: eng
month: '01'
oa_version: None
page: 587-598
place: Cham
publication: IUTAM Laminar-Turbulent Transition
publication_identifier:
eisbn:
- '9783030679026'
eissn:
- 1875-3493
isbn:
- '9783030679019'
issn:
- 1875-3507
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
series_title: IUTAM Bookseries
status: public
title: Effects of streaky structures on the instability of supersonic boundary layers
type: book_chapter
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 38
year: '2022'
...
---
_id: '12137'
abstract:
- lang: eng
text: We investigate the local self-sustained process underlying spiral turbulence
in counter-rotating Taylor–Couette flow using a periodic annular domain, shaped
as a parallelogram, two of whose sides are aligned with the cylindrical helix
described by the spiral pattern. The primary focus of the study is placed on the
emergence of drifting–rotating waves (DRW) that capture, in a relatively small
domain, the main features of coherent structures typically observed in developed
turbulence. The transitional dynamics of the subcritical region, far below the
first instability of the laminar circular Couette flow, is determined by the upper
and lower branches of DRW solutions originated at saddle-node bifurcations. The
mechanism whereby these solutions self-sustain, and the chaotic dynamics they
induce, are conspicuously reminiscent of other subcritical shear flows. Remarkably,
the flow properties of DRW persist even as the Reynolds number is increased beyond
the linear stability threshold of the base flow. Simulations in a narrow parallelogram
domain stretched in the azimuthal direction to revolve around the apparatus a
full turn confirm that self-sustained vortices eventually concentrate into a localised
pattern. The resulting statistical steady state satisfactorily reproduces qualitatively,
and to a certain degree also quantitatively, the topology and properties of spiral
turbulence as calculated in a large periodic domain of sufficient aspect ratio
that is representative of the real system.
acknowledgement: "K.D.’s research was supported by an Australian Research Council
Discovery Early Career\r\nResearcher Award (DE170100171). B.W., R.A., F.M. and A.M.
research was supported by the Spanish Ministerio de Economía y Competitivdad (grant
numbers FIS2016-77849-R and FIS2017-85794-P) and Ministerio de Ciencia e Innovación
(grant number PID2020-114043GB-I00) and the Generalitat de Catalunya (grant 2017-SGR-785).
B.W.’s research was also supported by the Chinese Scholarship Council (grant CSC
no. 201806440152)."
article_number: A21
article_processing_charge: No
article_type: original
author:
- first_name: B.
full_name: Wang, B.
last_name: Wang
- first_name: Roger
full_name: Ayats López, Roger
id: ab77522d-073b-11ed-8aff-e71b39258362
last_name: Ayats López
orcid: 0000-0001-6572-0621
- first_name: K.
full_name: Deguchi, K.
last_name: Deguchi
- first_name: F.
full_name: Mellibovsky, F.
last_name: Mellibovsky
- first_name: A.
full_name: Meseguer, A.
last_name: Meseguer
citation:
ama: Wang B, Ayats López R, Deguchi K, Mellibovsky F, Meseguer A. Self-sustainment
of coherent structures in counter-rotating Taylor–Couette flow. Journal of
Fluid Mechanics. 2022;951. doi:10.1017/jfm.2022.828
apa: Wang, B., Ayats López, R., Deguchi, K., Mellibovsky, F., & Meseguer, A.
(2022). Self-sustainment of coherent structures in counter-rotating Taylor–Couette
flow. Journal of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2022.828
chicago: Wang, B., Roger Ayats López, K. Deguchi, F. Mellibovsky, and A. Meseguer.
“Self-Sustainment of Coherent Structures in Counter-Rotating Taylor–Couette Flow.”
Journal of Fluid Mechanics. Cambridge University Press, 2022. https://doi.org/10.1017/jfm.2022.828.
ieee: B. Wang, R. Ayats López, K. Deguchi, F. Mellibovsky, and A. Meseguer, “Self-sustainment
of coherent structures in counter-rotating Taylor–Couette flow,” Journal of
Fluid Mechanics, vol. 951. Cambridge University Press, 2022.
ista: Wang B, Ayats López R, Deguchi K, Mellibovsky F, Meseguer A. 2022. Self-sustainment
of coherent structures in counter-rotating Taylor–Couette flow. Journal of Fluid
Mechanics. 951, A21.
mla: Wang, B., et al. “Self-Sustainment of Coherent Structures in Counter-Rotating
Taylor–Couette Flow.” Journal of Fluid Mechanics, vol. 951, A21, Cambridge
University Press, 2022, doi:10.1017/jfm.2022.828.
short: B. Wang, R. Ayats López, K. Deguchi, F. Mellibovsky, A. Meseguer, Journal
of Fluid Mechanics 951 (2022).
date_created: 2023-01-12T12:04:17Z
date_published: 2022-11-07T00:00:00Z
date_updated: 2023-08-04T08:54:16Z
day: '07'
department:
- _id: BjHo
doi: 10.1017/jfm.2022.828
external_id:
arxiv:
- '2207.12990'
isi:
- '000879446900001'
intvolume: ' 951'
isi: 1
keyword:
- Mechanical Engineering
- Mechanics of Materials
- Condensed Matter Physics
- Applied Mathematics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2207.12990'
month: '11'
oa: 1
oa_version: Preprint
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
- 1469-7645
issn:
- 0022-1120
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Self-sustainment of coherent structures in counter-rotating Taylor–Couette
flow
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 951
year: '2022'
...
---
_id: '12259'
abstract:
- lang: eng
text: 'Theoretical foundations of chaos have been predominantly laid out for finite-dimensional
dynamical systems, such as the three-body problem in classical mechanics and the
Lorenz model in dissipative systems. In contrast, many real-world chaotic phenomena,
e.g., weather, arise in systems with many (formally infinite) degrees of freedom,
which limits direct quantitative analysis of such systems using chaos theory.
In the present work, we demonstrate that the hydrodynamic pilot-wave systems offer
a bridge between low- and high-dimensional chaotic phenomena by allowing for a
systematic study of how the former connects to the latter. Specifically, we present
experimental results, which show the formation of low-dimensional chaotic attractors
upon destabilization of regular dynamics and a final transition to high-dimensional
chaos via the merging of distinct chaotic regions through a crisis bifurcation.
Moreover, we show that the post-crisis dynamics of the system can be rationalized
as consecutive scatterings from the nonattracting chaotic sets with lifetimes
following exponential distributions. '
acknowledgement: 'This work was partially funded by the Institute of Science and Technology
Austria Interdisciplinary Project Committee Grant “Pilot-Wave Hydrodynamics: Chaos
and Quantum Analogies.”'
article_number: '093138'
article_processing_charge: No
article_type: original
author:
- first_name: George H
full_name: Choueiri, George H
id: 448BD5BC-F248-11E8-B48F-1D18A9856A87
last_name: Choueiri
- first_name: Balachandra
full_name: Suri, Balachandra
id: 47A5E706-F248-11E8-B48F-1D18A9856A87
last_name: Suri
- first_name: Jack
full_name: Merrin, Jack
id: 4515C308-F248-11E8-B48F-1D18A9856A87
last_name: Merrin
orcid: 0000-0001-5145-4609
- first_name: Maksym
full_name: Serbyn, Maksym
id: 47809E7E-F248-11E8-B48F-1D18A9856A87
last_name: Serbyn
orcid: 0000-0002-2399-5827
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
citation:
ama: 'Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. Crises and chaotic
scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary
Journal of Nonlinear Science. 2022;32(9). doi:10.1063/5.0102904'
apa: 'Choueiri, G. H., Suri, B., Merrin, J., Serbyn, M., Hof, B., & Budanur,
N. B. (2022). Crises and chaotic scattering in hydrodynamic pilot-wave experiments.
Chaos: An Interdisciplinary Journal of Nonlinear Science. AIP Publishing.
https://doi.org/10.1063/5.0102904'
chicago: 'Choueiri, George H, Balachandra Suri, Jack Merrin, Maksym Serbyn, Björn
Hof, and Nazmi B Budanur. “Crises and Chaotic Scattering in Hydrodynamic Pilot-Wave
Experiments.” Chaos: An Interdisciplinary Journal of Nonlinear Science.
AIP Publishing, 2022. https://doi.org/10.1063/5.0102904.'
ieee: 'G. H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, and N. B. Budanur,
“Crises and chaotic scattering in hydrodynamic pilot-wave experiments,” Chaos:
An Interdisciplinary Journal of Nonlinear Science, vol. 32, no. 9. AIP Publishing,
2022.'
ista: 'Choueiri GH, Suri B, Merrin J, Serbyn M, Hof B, Budanur NB. 2022. Crises
and chaotic scattering in hydrodynamic pilot-wave experiments. Chaos: An Interdisciplinary
Journal of Nonlinear Science. 32(9), 093138.'
mla: 'Choueiri, George H., et al. “Crises and Chaotic Scattering in Hydrodynamic
Pilot-Wave Experiments.” Chaos: An Interdisciplinary Journal of Nonlinear Science,
vol. 32, no. 9, 093138, AIP Publishing, 2022, doi:10.1063/5.0102904.'
short: 'G.H. Choueiri, B. Suri, J. Merrin, M. Serbyn, B. Hof, N.B. Budanur, Chaos:
An Interdisciplinary Journal of Nonlinear Science 32 (2022).'
date_created: 2023-01-16T09:58:16Z
date_published: 2022-09-26T00:00:00Z
date_updated: 2023-08-04T09:51:17Z
day: '26'
ddc:
- '530'
department:
- _id: MaSe
- _id: BjHo
- _id: NanoFab
doi: 10.1063/5.0102904
external_id:
arxiv:
- '2206.01531'
isi:
- '000861009600005'
file:
- access_level: open_access
checksum: 17881eff8b21969359a2dd64620120ba
content_type: application/pdf
creator: dernst
date_created: 2023-01-30T09:41:12Z
date_updated: 2023-01-30T09:41:12Z
file_id: '12445'
file_name: 2022_Chaos_Choueiri.pdf
file_size: 3209644
relation: main_file
success: 1
file_date_updated: 2023-01-30T09:41:12Z
has_accepted_license: '1'
intvolume: ' 32'
isi: 1
issue: '9'
keyword:
- Applied Mathematics
- General Physics and Astronomy
- Mathematical Physics
- Statistical and Nonlinear Physics
language:
- iso: eng
month: '09'
oa: 1
oa_version: Published Version
publication: 'Chaos: An Interdisciplinary Journal of Nonlinear Science'
publication_identifier:
eissn:
- 1089-7682
issn:
- 1054-1500
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Crises and chaotic scattering in hydrodynamic pilot-wave experiments
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 32
year: '2022'
...
---
_id: '12279'
abstract:
- lang: eng
text: We report frictional drag reduction and a complete flow relaminarization of
elastic turbulence (ET) at vanishing inertia in a viscoelastic channel flow past
an obstacle. We show that the intensity of the observed elastic waves and wall-normal
vorticity correlate well with the measured drag above the onset of ET. Moreover,
we find that the elastic wave frequency grows with the Weissenberg number, and
at sufficiently high frequency it causes a decay of the elastic waves, resulting
in ET attenuation and drag reduction. Thus, this allows us to substantiate a physical
mechanism, involving the interaction of elastic waves with wall-normal vorticity
fluctuations, leading to the drag reduction and relaminarization phenomena at
low Reynolds number.
acknowledgement: "We thank G. Falkovich for discussion and Guy Han for technical support.
We are grateful to N. Jha for his help in µPIV measurements. This work is partially
supported by the grants from\r\nIsrael Science Foundation (ISF; grant #882/15 and
grant #784/19) and Binational USA-Israel Foundation (BSF;grant #2016145). "
article_number: L081301
article_processing_charge: No
article_type: original
author:
- first_name: M. Vijay
full_name: Kumar, M. Vijay
last_name: Kumar
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Dongyang
full_name: Li, Dongyang
last_name: Li
- first_name: Victor
full_name: Steinberg, Victor
last_name: Steinberg
citation:
ama: Kumar MV, Varshney A, Li D, Steinberg V. Relaminarization of elastic turbulence.
Physical Review Fluids. 2022;7(8). doi:10.1103/physrevfluids.7.l081301
apa: Kumar, M. V., Varshney, A., Li, D., & Steinberg, V. (2022). Relaminarization
of elastic turbulence. Physical Review Fluids. American Physical Society.
https://doi.org/10.1103/physrevfluids.7.l081301
chicago: Kumar, M. Vijay, Atul Varshney, Dongyang Li, and Victor Steinberg. “Relaminarization
of Elastic Turbulence.” Physical Review Fluids. American Physical Society,
2022. https://doi.org/10.1103/physrevfluids.7.l081301.
ieee: M. V. Kumar, A. Varshney, D. Li, and V. Steinberg, “Relaminarization of elastic
turbulence,” Physical Review Fluids, vol. 7, no. 8. American Physical Society,
2022.
ista: Kumar MV, Varshney A, Li D, Steinberg V. 2022. Relaminarization of elastic
turbulence. Physical Review Fluids. 7(8), L081301.
mla: Kumar, M. Vijay, et al. “Relaminarization of Elastic Turbulence.” Physical
Review Fluids, vol. 7, no. 8, L081301, American Physical Society, 2022, doi:10.1103/physrevfluids.7.l081301.
short: M.V. Kumar, A. Varshney, D. Li, V. Steinberg, Physical Review Fluids 7 (2022).
date_created: 2023-01-16T10:02:40Z
date_published: 2022-08-03T00:00:00Z
date_updated: 2023-08-04T10:26:40Z
day: '03'
department:
- _id: BjHo
doi: 10.1103/physrevfluids.7.l081301
external_id:
arxiv:
- '2205.12871'
isi:
- '000836397000001'
intvolume: ' 7'
isi: 1
issue: '8'
keyword:
- Fluid Flow and Transfer Processes
- Modeling and Simulation
- Computational Mechanics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: ' https://doi.org/10.48550/arXiv.2205.12871'
month: '08'
oa: 1
oa_version: Preprint
publication: Physical Review Fluids
publication_identifier:
issn:
- 2469-990X
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Relaminarization of elastic turbulence
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 7
year: '2022'
...
---
_id: '12146'
abstract:
- lang: eng
text: 'In this paper, we explore the stability and dynamical relevance of a wide
variety of steady, time-periodic, quasiperiodic, and chaotic flows arising between
orthogonally stretching parallel plates. We first explore the stability of all
the steady flow solution families formerly identified by Ayats et al. [“Flows
between orthogonally stretching parallel plates,” Phys. Fluids 33, 024103 (2021)],
concluding that only the one that originates from the Stokesian approximation
is actually stable. When both plates are shrinking at identical or nearly the
same deceleration rates, this Stokesian flow exhibits a Hopf bifurcation that
leads to stable time-periodic regimes. The resulting time-periodic orbits or flows
are tracked for different Reynolds numbers and stretching rates while monitoring
their Floquet exponents to identify secondary instabilities. It is found that
these time-periodic flows also exhibit Neimark–Sacker bifurcations, generating
stable quasiperiodic flows (tori) that may sometimes give rise to chaotic dynamics
through a Ruelle–Takens–Newhouse scenario. However, chaotic dynamics is unusually
observed, as the quasiperiodic flows generally become phase-locked through a resonance
mechanism before a strange attractor may arise, thus restoring the time-periodicity
of the flow. In this work, we have identified and tracked four different resonance
regions, also known as Arnold tongues or horns. In particular, the 1 : 4 strong
resonance region is explored in great detail, where the identified scenarios are
in very good agreement with normal form theory. '
acknowledgement: "This work was supported by the Spanish MINECO under Grant Nos. FIS2017-85794-P
and PRX18/00179, the Spanish MICINN through Grant No. PID2020-114043GB-I00, and
the\r\nGeneralitat de Catalunya under Grant No. 2017-SGR-785. B.W.’s research was
also supported by the Chinese Scholarship Council through Grant CSC No. 201806440152."
article_number: '114111'
article_processing_charge: No
article_type: original
author:
- first_name: B.
full_name: Wang, B.
last_name: Wang
- first_name: Roger
full_name: Ayats López, Roger
id: ab77522d-073b-11ed-8aff-e71b39258362
last_name: Ayats López
orcid: 0000-0001-6572-0621
- first_name: A.
full_name: Meseguer, A.
last_name: Meseguer
- first_name: F.
full_name: Marques, F.
last_name: Marques
citation:
ama: Wang B, Ayats López R, Meseguer A, Marques F. Phase-locking flows between orthogonally
stretching parallel plates. Physics of Fluids. 2022;34(11). doi:10.1063/5.0124152
apa: Wang, B., Ayats López, R., Meseguer, A., & Marques, F. (2022). Phase-locking
flows between orthogonally stretching parallel plates. Physics of Fluids.
AIP Publishing. https://doi.org/10.1063/5.0124152
chicago: Wang, B., Roger Ayats López, A. Meseguer, and F. Marques. “Phase-Locking
Flows between Orthogonally Stretching Parallel Plates.” Physics of Fluids.
AIP Publishing, 2022. https://doi.org/10.1063/5.0124152.
ieee: B. Wang, R. Ayats López, A. Meseguer, and F. Marques, “Phase-locking flows
between orthogonally stretching parallel plates,” Physics of Fluids, vol.
34, no. 11. AIP Publishing, 2022.
ista: Wang B, Ayats López R, Meseguer A, Marques F. 2022. Phase-locking flows between
orthogonally stretching parallel plates. Physics of Fluids. 34(11), 114111.
mla: Wang, B., et al. “Phase-Locking Flows between Orthogonally Stretching Parallel
Plates.” Physics of Fluids, vol. 34, no. 11, 114111, AIP Publishing, 2022,
doi:10.1063/5.0124152.
short: B. Wang, R. Ayats López, A. Meseguer, F. Marques, Physics of Fluids 34 (2022).
date_created: 2023-01-12T12:06:58Z
date_published: 2022-11-04T00:00:00Z
date_updated: 2023-10-03T11:07:58Z
day: '04'
department:
- _id: BjHo
doi: 10.1063/5.0124152
external_id:
isi:
- '000880665300024'
intvolume: ' 34'
isi: 1
issue: '11'
keyword:
- Condensed Matter Physics
- Fluid Flow and Transfer Processes
- Mechanics of Materials
- Computational Mechanics
- Mechanical Engineering
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://upcommons.upc.edu/handle/2117/385635
month: '11'
oa: 1
oa_version: Submitted Version
publication: Physics of Fluids
publication_identifier:
eissn:
- 1089-7666
issn:
- 1070-6631
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Phase-locking flows between orthogonally stretching parallel plates
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 34
year: '2022'
...
---
_id: '10791'
abstract:
- lang: eng
text: The mammalian neocortex is composed of diverse neuronal and glial cell classes
that broadly arrange in six distinct laminae. Cortical layers emerge during development
and defects in the developmental programs that orchestrate cortical lamination
are associated with neurodevelopmental diseases. The developmental principle of
cortical layer formation depends on concerted radial projection neuron migration,
from their birthplace to their final target position. Radial migration occurs
in defined sequential steps, regulated by a large array of signaling pathways.
However, based on genetic loss-of-function experiments, most studies have thus
far focused on the role of cell-autonomous gene function. Yet, cortical neuron
migration in situ is a complex process and migrating neurons traverse along diverse
cellular compartments and environments. The role of tissue-wide properties and
genetic state in radial neuron migration is however not clear. Here we utilized
mosaic analysis with double markers (MADM) technology to either sparsely or globally
delete gene function, followed by quantitative single-cell phenotyping. The MADM-based
gene ablation paradigms in combination with computational modeling demonstrated
that global tissue-wide effects predominate cell-autonomous gene function albeit
in a gene-specific manner. Our results thus suggest that the genetic landscape
in a tissue critically affects the overall migration phenotype of individual cortical
projection neurons. In a broader context, our findings imply that global tissue-wide
effects represent an essential component of the underlying etiology associated
with focal malformations of cortical development in particular, and neurological
diseases in general.
acknowledged_ssus:
- _id: LifeSc
- _id: PreCl
- _id: Bio
acknowledgement: "A.H.H. was a recipient of a DOC Fellowship (24812) of the Austrian
Academy of Sciences. This work also received support from IST Austria institutional
funds; the People Programme (Marie Curie Actions) of the European Union’s Seventh
Framework Programme (FP7/2007–2013) under REA grant agreement No 618444 to S.H.\r\nAPC
funding was obtained by IST Austria institutional funds.\r\nWe thank A. Sommer and
C. Czepe (VBCF GmbH, NGS Unit), L. Andersen, J. Sonntag and J. Renno for technical
support and/or initial experiments; M. Sixt, J. Nimpf and all members of the Hippenmeyer
lab for discussion. This research was supported by the Scientific Service Units
of IST Austria through resources provided by the Imaging and Optics Facility, Lab
Support Facility and Preclinical Facility."
article_number: kvac009
article_processing_charge: No
article_type: original
author:
- first_name: Andi H
full_name: Hansen, Andi H
id: 38853E16-F248-11E8-B48F-1D18A9856A87
last_name: Hansen
- first_name: Florian
full_name: Pauler, Florian
id: 48EA0138-F248-11E8-B48F-1D18A9856A87
last_name: Pauler
orcid: 0000-0002-7462-0048
- first_name: Michael
full_name: Riedl, Michael
id: 3BE60946-F248-11E8-B48F-1D18A9856A87
last_name: Riedl
orcid: 0000-0003-4844-6311
- first_name: Carmen
full_name: Streicher, Carmen
id: 36BCB99C-F248-11E8-B48F-1D18A9856A87
last_name: Streicher
- first_name: Anna-Magdalena
full_name: Heger, Anna-Magdalena
id: 4B76FFD2-F248-11E8-B48F-1D18A9856A87
last_name: Heger
- first_name: Susanne
full_name: Laukoter, Susanne
id: 2D6B7A9A-F248-11E8-B48F-1D18A9856A87
last_name: Laukoter
orcid: 0000-0002-7903-3010
- first_name: Christoph M
full_name: Sommer, Christoph M
id: 4DF26D8C-F248-11E8-B48F-1D18A9856A87
last_name: Sommer
orcid: 0000-0003-1216-9105
- first_name: Armel
full_name: Nicolas, Armel
id: 2A103192-F248-11E8-B48F-1D18A9856A87
last_name: Nicolas
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
- first_name: Li Huei
full_name: Tsai, Li Huei
last_name: Tsai
- first_name: Thomas
full_name: Rülicke, Thomas
last_name: Rülicke
- first_name: Simon
full_name: Hippenmeyer, Simon
id: 37B36620-F248-11E8-B48F-1D18A9856A87
last_name: Hippenmeyer
orcid: 0000-0003-2279-1061
citation:
ama: Hansen AH, Pauler F, Riedl M, et al. Tissue-wide effects override cell-intrinsic
gene function in radial neuron migration. Oxford Open Neuroscience. 2022;1(1).
doi:10.1093/oons/kvac009
apa: Hansen, A. H., Pauler, F., Riedl, M., Streicher, C., Heger, A.-M., Laukoter,
S., … Hippenmeyer, S. (2022). Tissue-wide effects override cell-intrinsic gene
function in radial neuron migration. Oxford Open Neuroscience. Oxford Academic.
https://doi.org/10.1093/oons/kvac009
chicago: Hansen, Andi H, Florian Pauler, Michael Riedl, Carmen Streicher, Anna-Magdalena
Heger, Susanne Laukoter, Christoph M Sommer, et al. “Tissue-Wide Effects Override
Cell-Intrinsic Gene Function in Radial Neuron Migration.” Oxford Open Neuroscience.
Oxford Academic, 2022. https://doi.org/10.1093/oons/kvac009.
ieee: A. H. Hansen et al., “Tissue-wide effects override cell-intrinsic gene
function in radial neuron migration,” Oxford Open Neuroscience, vol. 1,
no. 1. Oxford Academic, 2022.
ista: Hansen AH, Pauler F, Riedl M, Streicher C, Heger A-M, Laukoter S, Sommer CM,
Nicolas A, Hof B, Tsai LH, Rülicke T, Hippenmeyer S. 2022. Tissue-wide effects
override cell-intrinsic gene function in radial neuron migration. Oxford Open
Neuroscience. 1(1), kvac009.
mla: Hansen, Andi H., et al. “Tissue-Wide Effects Override Cell-Intrinsic Gene Function
in Radial Neuron Migration.” Oxford Open Neuroscience, vol. 1, no. 1, kvac009,
Oxford Academic, 2022, doi:10.1093/oons/kvac009.
short: A.H. Hansen, F. Pauler, M. Riedl, C. Streicher, A.-M. Heger, S. Laukoter,
C.M. Sommer, A. Nicolas, B. Hof, L.H. Tsai, T. Rülicke, S. Hippenmeyer, Oxford
Open Neuroscience 1 (2022).
date_created: 2022-02-25T07:52:11Z
date_published: 2022-07-07T00:00:00Z
date_updated: 2023-11-30T10:55:12Z
day: '07'
ddc:
- '570'
department:
- _id: SiHi
- _id: BjHo
- _id: LifeSc
- _id: EM-Fac
doi: 10.1093/oons/kvac009
ec_funded: 1
file:
- access_level: open_access
checksum: 822e76e056c07099d1fb27d1ece5941b
content_type: application/pdf
creator: dernst
date_created: 2023-08-16T08:00:30Z
date_updated: 2023-08-16T08:00:30Z
file_id: '14061'
file_name: 2023_OxfordOpenNeuroscience_Hansen.pdf
file_size: 4846551
relation: main_file
success: 1
file_date_updated: 2023-08-16T08:00:30Z
has_accepted_license: '1'
intvolume: ' 1'
issue: '1'
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
project:
- _id: 25D61E48-B435-11E9-9278-68D0E5697425
call_identifier: FP7
grant_number: '618444'
name: Molecular Mechanisms of Cerebral Cortex Development
- _id: 2625A13E-B435-11E9-9278-68D0E5697425
grant_number: '24812'
name: Molecular Mechanisms of Radial Neuronal Migration
publication: Oxford Open Neuroscience
publication_identifier:
eissn:
- 2753-149X
publication_status: published
publisher: Oxford Academic
quality_controlled: '1'
related_material:
record:
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relation: dissertation_contains
status: public
- id: '14530'
relation: dissertation_contains
status: public
status: public
title: Tissue-wide effects override cell-intrinsic gene function in radial neuron
migration
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 1
year: '2022'
...
---
_id: '10703'
abstract:
- lang: eng
text: 'When crawling through the body, leukocytes often traverse tissues that are
densely packed with extracellular matrix and other cells, and this raises the
question: How do leukocytes overcome compressive mechanical loads? Here, we show
that the actin cortex of leukocytes is mechanoresponsive and that this responsiveness
requires neither force sensing via the nucleus nor adhesive interactions with
a substrate. Upon global compression of the cell body as well as local indentation
of the plasma membrane, Wiskott-Aldrich syndrome protein (WASp) assembles into
dot-like structures, providing activation platforms for Arp2/3 nucleated actin
patches. These patches locally push against the external load, which can be obstructing
collagen fibers or other cells, and thereby create space to facilitate forward
locomotion. We show in vitro and in vivo that this WASp function is rate limiting
for ameboid leukocyte migration in dense but not in loose environments and is
required for trafficking through diverse tissues such as skin and lymph nodes.'
acknowledged_ssus:
- _id: LifeSc
- _id: Bio
- _id: EM-Fac
acknowledgement: We thank N. Darwish-Miranda, F. Leite, F.P. Assen, and A. Eichner
for advice and help with experiments. We thank J. Renkawitz, E. Kiermaier, A. Juanes
Garcia, and M. Avellaneda for critical reading of the manuscript. We thank M. Driscoll
for advice on fluorescent labeling of collagen gels. This research was supported
by the Scientific Service Units (SSUs) of IST Austria through resources provided
by Molecular Biology Services/Lab Support Facility (LSF)/Bioimaging Facility/Electron
Microscopy Facility. This work was funded by grants from the European Research Council
( CoG 724373 ) and the Austrian Science Foundation (FWF) to M.S. F.G. received funding
from the European Union’s Horizon 2020 research and innovation program under the
Marie Skłodowska-Curie grant agreement no. 747687.
article_processing_charge: No
article_type: original
author:
- first_name: Florian
full_name: Gaertner, Florian
last_name: Gaertner
- first_name: Patricia
full_name: Reis-Rodrigues, Patricia
last_name: Reis-Rodrigues
- first_name: Ingrid
full_name: De Vries, Ingrid
id: 4C7D837E-F248-11E8-B48F-1D18A9856A87
last_name: De Vries
- first_name: Miroslav
full_name: Hons, Miroslav
id: 4167FE56-F248-11E8-B48F-1D18A9856A87
last_name: Hons
orcid: 0000-0002-6625-3348
- first_name: Juan
full_name: Aguilera, Juan
last_name: Aguilera
- first_name: Michael
full_name: Riedl, Michael
id: 3BE60946-F248-11E8-B48F-1D18A9856A87
last_name: Riedl
orcid: 0000-0003-4844-6311
- first_name: Alexander F
full_name: Leithner, Alexander F
id: 3B1B77E4-F248-11E8-B48F-1D18A9856A87
last_name: Leithner
orcid: 0000-0002-1073-744X
- first_name: Saren
full_name: Tasciyan, Saren
id: 4323B49C-F248-11E8-B48F-1D18A9856A87
last_name: Tasciyan
orcid: 0000-0003-1671-393X
- first_name: Aglaja
full_name: Kopf, Aglaja
id: 31DAC7B6-F248-11E8-B48F-1D18A9856A87
last_name: Kopf
orcid: 0000-0002-2187-6656
- first_name: Jack
full_name: Merrin, Jack
id: 4515C308-F248-11E8-B48F-1D18A9856A87
last_name: Merrin
orcid: 0000-0001-5145-4609
- first_name: Vanessa
full_name: Zheden, Vanessa
id: 39C5A68A-F248-11E8-B48F-1D18A9856A87
last_name: Zheden
orcid: 0000-0002-9438-4783
- first_name: Walter
full_name: Kaufmann, Walter
id: 3F99E422-F248-11E8-B48F-1D18A9856A87
last_name: Kaufmann
orcid: 0000-0001-9735-5315
- first_name: Robert
full_name: Hauschild, Robert
id: 4E01D6B4-F248-11E8-B48F-1D18A9856A87
last_name: Hauschild
orcid: 0000-0001-9843-3522
- first_name: Michael K
full_name: Sixt, Michael K
id: 41E9FBEA-F248-11E8-B48F-1D18A9856A87
last_name: Sixt
orcid: 0000-0002-6620-9179
citation:
ama: Gaertner F, Reis-Rodrigues P, de Vries I, et al. WASp triggers mechanosensitive
actin patches to facilitate immune cell migration in dense tissues. Developmental
Cell. 2022;57(1):47-62.e9. doi:10.1016/j.devcel.2021.11.024
apa: Gaertner, F., Reis-Rodrigues, P., de Vries, I., Hons, M., Aguilera, J., Riedl,
M., … Sixt, M. K. (2022). WASp triggers mechanosensitive actin patches to facilitate
immune cell migration in dense tissues. Developmental Cell. Cell Press ;
Elsevier. https://doi.org/10.1016/j.devcel.2021.11.024
chicago: Gaertner, Florian, Patricia Reis-Rodrigues, Ingrid de Vries, Miroslav Hons,
Juan Aguilera, Michael Riedl, Alexander F Leithner, et al. “WASp Triggers Mechanosensitive
Actin Patches to Facilitate Immune Cell Migration in Dense Tissues.” Developmental
Cell. Cell Press ; Elsevier, 2022. https://doi.org/10.1016/j.devcel.2021.11.024.
ieee: F. Gaertner et al., “WASp triggers mechanosensitive actin patches to
facilitate immune cell migration in dense tissues,” Developmental Cell,
vol. 57, no. 1. Cell Press ; Elsevier, p. 47–62.e9, 2022.
ista: Gaertner F, Reis-Rodrigues P, de Vries I, Hons M, Aguilera J, Riedl M, Leithner
AF, Tasciyan S, Kopf A, Merrin J, Zheden V, Kaufmann W, Hauschild R, Sixt MK.
2022. WASp triggers mechanosensitive actin patches to facilitate immune cell migration
in dense tissues. Developmental Cell. 57(1), 47–62.e9.
mla: Gaertner, Florian, et al. “WASp Triggers Mechanosensitive Actin Patches to
Facilitate Immune Cell Migration in Dense Tissues.” Developmental Cell,
vol. 57, no. 1, Cell Press ; Elsevier, 2022, p. 47–62.e9, doi:10.1016/j.devcel.2021.11.024.
short: F. Gaertner, P. Reis-Rodrigues, I. de Vries, M. Hons, J. Aguilera, M. Riedl,
A.F. Leithner, S. Tasciyan, A. Kopf, J. Merrin, V. Zheden, W. Kaufmann, R. Hauschild,
M.K. Sixt, Developmental Cell 57 (2022) 47–62.e9.
date_created: 2022-01-30T23:01:33Z
date_published: 2022-01-10T00:00:00Z
date_updated: 2024-03-27T23:30:23Z
day: '10'
ddc:
- '570'
department:
- _id: MiSi
- _id: EM-Fac
- _id: NanoFab
- _id: BjHo
doi: 10.1016/j.devcel.2021.11.024
ec_funded: 1
external_id:
isi:
- '000768933800005'
pmid:
- '34919802'
intvolume: ' 57'
isi: 1
issue: '1'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://www.sciencedirect.com/science/article/pii/S1534580721009497
month: '01'
oa: 1
oa_version: Published Version
page: 47-62.e9
pmid: 1
project:
- _id: 260AA4E2-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '747687'
name: Mechanical Adaptation of Lamellipodial Actin Networks in Migrating Cells
- _id: 25FE9508-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '724373'
name: Cellular navigation along spatial gradients
publication: Developmental Cell
publication_identifier:
eissn:
- 1878-1551
issn:
- 1534-5807
publication_status: published
publisher: Cell Press ; Elsevier
quality_controlled: '1'
related_material:
record:
- id: '12726'
relation: dissertation_contains
status: public
- id: '14530'
relation: dissertation_contains
status: public
- id: '12401'
relation: dissertation_contains
status: public
scopus_import: '1'
status: public
title: WASp triggers mechanosensitive actin patches to facilitate immune cell migration
in dense tissues
tmp:
image: /images/cc_by_nc_nd.png
legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
(CC BY-NC-ND 4.0)
short: CC BY-NC-ND (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 57
year: '2022'
...
---
_id: '8999'
abstract:
- lang: eng
text: "In many basic shear flows, such as pipe, Couette, and channel flow, turbulence
does not\r\narise from an instability of the laminar state, and both dynamical
states co-exist. With decreasing flow speed (i.e., decreasing Reynolds number)
the fraction of fluid in laminar motion increases while turbulence recedes and
eventually the entire flow relaminarizes. The first step towards understanding
the nature of this transition is to determine if the phase change is of either
first or second order. In the former case, the turbulent fraction would drop discontinuously
to zero as the Reynolds number decreases while in the latter the process would
be continuous. For Couette flow, the flow between two parallel plates, earlier
studies suggest a discontinuous scenario. In the present study we realize a Couette
flow between two concentric cylinders which allows studies to be carried out in
large aspect ratios and for extensive observation times. The presented measurements
show that the transition in this circular Couette geometry is continuous suggesting
that former studies were limited by finite size effects. A further characterization
of this transition, in particular its relation to the directed percolation universality
class, requires even larger system sizes than presently available. "
acknowledgement: "This research was funded by the Central Research Development Fund
of the University of\r\nBremen grant number ZF04B /2019/FB04 Avila_Kerstin (“Independent
Project for Postdocs”). Shreyas Jalikop is acknowledged for recording some of the
lifetime measurements\r\n"
article_number: '58'
article_processing_charge: No
article_type: original
author:
- first_name: Kerstin
full_name: Avila, Kerstin
id: fcf74381-53e1-11eb-a6dc-b0e2acf78757
last_name: Avila
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Avila K, Hof B. Second-order phase transition in counter-rotating taylor-couette
flow experiment. Entropy. 2021;23(1). doi:10.3390/e23010058
apa: Avila, K., & Hof, B. (2021). Second-order phase transition in counter-rotating
taylor-couette flow experiment. Entropy. MDPI. https://doi.org/10.3390/e23010058
chicago: Avila, Kerstin, and Björn Hof. “Second-Order Phase Transition in Counter-Rotating
Taylor-Couette Flow Experiment.” Entropy. MDPI, 2021. https://doi.org/10.3390/e23010058.
ieee: K. Avila and B. Hof, “Second-order phase transition in counter-rotating taylor-couette
flow experiment,” Entropy, vol. 23, no. 1. MDPI, 2021.
ista: Avila K, Hof B. 2021. Second-order phase transition in counter-rotating taylor-couette
flow experiment. Entropy. 23(1), 58.
mla: Avila, Kerstin, and Björn Hof. “Second-Order Phase Transition in Counter-Rotating
Taylor-Couette Flow Experiment.” Entropy, vol. 23, no. 1, 58, MDPI, 2021,
doi:10.3390/e23010058.
short: K. Avila, B. Hof, Entropy 23 (2021).
date_created: 2021-01-10T23:01:17Z
date_published: 2021-01-01T00:00:00Z
date_updated: 2023-08-07T13:31:07Z
day: '01'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.3390/e23010058
external_id:
isi:
- '000610135400001'
pmid:
- '33396499'
file:
- access_level: open_access
checksum: 3ba3dd8b7eecff713b72c5e9ba30d626
content_type: application/pdf
creator: dernst
date_created: 2021-01-11T07:50:32Z
date_updated: 2021-01-11T07:50:32Z
file_id: '9003'
file_name: 2021_Entropy_Avila.pdf
file_size: 9456389
relation: main_file
success: 1
file_date_updated: 2021-01-11T07:50:32Z
has_accepted_license: '1'
intvolume: ' 23'
isi: 1
issue: '1'
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
pmid: 1
publication: Entropy
publication_identifier:
eissn:
- 1099-4300
publication_status: published
publisher: MDPI
quality_controlled: '1'
scopus_import: '1'
status: public
title: Second-order phase transition in counter-rotating taylor-couette flow experiment
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 23
year: '2021'
...
---
_id: '9207'
abstract:
- lang: eng
text: "In this paper we experimentally study the transitional range of Reynolds
numbers in\r\nplane Couette–Poiseuille flow, focusing our attention on the localized
turbulent structures\r\ntriggered by a strong impulsive jet and the large-scale
flow generated around these\r\nstructures. We present a detailed investigation
of the large-scale flow and show how\r\nits amplitude depends on Reynolds number
and amplitude perturbation. In addition,\r\nwe characterize the initial dynamics
of the localized turbulent spot, which includes the\r\ncoupling between the small
and large scales, as well as the dependence of the advection\r\nspeed on the large-scale
flow generated around the spot. Finally, we provide the first\r\nexperimental
measurements of the large-scale flow around an oblique turbulent band."
acknowledgement: "We thank Y. Duguet, S. Gomé, G. Lemoult, T. Liu, B. Semin and L.S.
Tuckerman for\r\nfruitful discussions. \r\nThis work was supported by a grant, TRANSFLOW,
provided by the Agence Nationale de\r\nla Recherche (ANR). A.M.P. was partially
supported by the French Embassy in Russia (I.I. Mechnikov scholarship) and by the
Russian Science Foundation (project no. 18-79-00189). L.K. was partially supported
by the European Union’s Horizon 2020 research and innovation programme under the
Marie Skłodowska-Curie grant agreement no. 754411."
article_number: A24
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Lukasz
full_name: Klotz, Lukasz
id: 2C9AF1C2-F248-11E8-B48F-1D18A9856A87
last_name: Klotz
orcid: 0000-0003-1740-7635
- first_name: A. M.
full_name: Pavlenko, A. M.
last_name: Pavlenko
- first_name: J. E.
full_name: Wesfreid, J. E.
last_name: Wesfreid
citation:
ama: 'Klotz L, Pavlenko AM, Wesfreid JE. Experimental measurements in plane Couette-Poiseuille
flow: Dynamics of the large- and small-scale flow. Journal of Fluid Mechanics.
2021;912. doi:10.1017/jfm.2020.1089'
apa: 'Klotz, L., Pavlenko, A. M., & Wesfreid, J. E. (2021). Experimental measurements
in plane Couette-Poiseuille flow: Dynamics of the large- and small-scale flow.
Journal of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2020.1089'
chicago: 'Klotz, Lukasz, A. M. Pavlenko, and J. E. Wesfreid. “Experimental Measurements
in Plane Couette-Poiseuille Flow: Dynamics of the Large- and Small-Scale Flow.”
Journal of Fluid Mechanics. Cambridge University Press, 2021. https://doi.org/10.1017/jfm.2020.1089.'
ieee: 'L. Klotz, A. M. Pavlenko, and J. E. Wesfreid, “Experimental measurements
in plane Couette-Poiseuille flow: Dynamics of the large- and small-scale flow,”
Journal of Fluid Mechanics, vol. 912. Cambridge University Press, 2021.'
ista: 'Klotz L, Pavlenko AM, Wesfreid JE. 2021. Experimental measurements in plane
Couette-Poiseuille flow: Dynamics of the large- and small-scale flow. Journal
of Fluid Mechanics. 912, A24.'
mla: 'Klotz, Lukasz, et al. “Experimental Measurements in Plane Couette-Poiseuille
Flow: Dynamics of the Large- and Small-Scale Flow.” Journal of Fluid Mechanics,
vol. 912, A24, Cambridge University Press, 2021, doi:10.1017/jfm.2020.1089.'
short: L. Klotz, A.M. Pavlenko, J.E. Wesfreid, Journal of Fluid Mechanics 912 (2021).
date_created: 2021-02-28T23:01:25Z
date_published: 2021-02-15T00:00:00Z
date_updated: 2023-08-07T13:55:40Z
day: '15'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1017/jfm.2020.1089
ec_funded: 1
external_id:
isi:
- '000618034400001'
file:
- access_level: open_access
checksum: b8020d6338667673e34fde0608913dd2
content_type: application/pdf
creator: dernst
date_created: 2021-03-03T09:49:34Z
date_updated: 2021-03-03T09:49:34Z
file_id: '9220'
file_name: 2021_JourFluidMechanics_Klotz.pdf
file_size: 4124471
relation: main_file
success: 1
file_date_updated: 2021-03-03T09:49:34Z
has_accepted_license: '1'
intvolume: ' 912'
isi: 1
language:
- iso: eng
month: '02'
oa: 1
oa_version: Published Version
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
call_identifier: H2020
grant_number: '754411'
name: ISTplus - Postdoctoral Fellowships
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
- 1469-7645
issn:
- 0022-1120
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Experimental measurements in plane Couette-Poiseuille flow: Dynamics of the
large- and small-scale flow'
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 912
year: '2021'
...
---
_id: '9297'
abstract:
- lang: eng
text: 'We report the results of an experimental investigation into the decay of
turbulence in plane Couette–Poiseuille flow using ‘quench’ experiments where the
flow laminarises after a sudden reduction in Reynolds number Re. Specifically,
we study the velocity field in the streamwise–spanwise plane. We show that the
spanwise velocity containing rolls decays faster than the streamwise velocity,
which displays elongated regions of higher or lower velocity called streaks. At
final Reynolds numbers above 425, the decay of streaks displays two stages: first
a slow decay when rolls are present and secondly a more rapid decay of streaks
alone. The difference in behaviour results from the regeneration of streaks by
rolls, called the lift-up effect. We define the turbulent fraction as the portion
of the flow containing turbulence and this is estimated by thresholding the spanwise
velocity component. It decreases linearly with time in the whole range of final
Re. The corresponding decay slope increases linearly with final Re. The extrapolated
value at which this decay slope vanishes is Reaz≈656±10, close to Reg≈670 at which
turbulence is self-sustained. The decay of the energy computed from the spanwise
velocity component is found to be exponential. The corresponding decay rate increases
linearly with Re, with an extrapolated vanishing value at ReAz≈688±10. This value
is also close to the value at which the turbulence is self-sustained, showing
that valuable information on the transition can be obtained over a wide range
of Re.'
acknowledgement: "We gratefully acknowledge Joran Rolland, Yohann Duguet, Romain Monchaux,
S´ebastien Gom´e, Laurette Tuckerman, Dwight Barkley, Olivier Dauchot and Sabine
Bottin for fruitful discussions. We thank Xavier Benoit-Gonin, Amaury Fourgeaud,
Thierry Darnige, Olivier Brouard and Justine Laurent for technical help. This work
has benefited from the ANR TransFlow, and by starting grants obtained by B.S. from
CNRS (INSIS) and ESPCI. T.M. was\r\nsupported by a Joliot visiting professorship
grant from ESPCI."
article_number: A65
article_processing_charge: No
article_type: original
author:
- first_name: T.
full_name: Liu, T.
last_name: Liu
- first_name: B.
full_name: Semin, B.
last_name: Semin
- first_name: Lukasz
full_name: Klotz, Lukasz
id: 2C9AF1C2-F248-11E8-B48F-1D18A9856A87
last_name: Klotz
orcid: 0000-0003-1740-7635
- first_name: R.
full_name: Godoy-Diana, R.
last_name: Godoy-Diana
- first_name: J. E.
full_name: Wesfreid, J. E.
last_name: Wesfreid
- first_name: T.
full_name: Mullin, T.
last_name: Mullin
citation:
ama: Liu T, Semin B, Klotz L, Godoy-Diana R, Wesfreid JE, Mullin T. Decay of streaks
and rolls in plane Couette-Poiseuille flow. Journal of Fluid Mechanics.
2021;915. doi:10.1017/jfm.2021.89
apa: Liu, T., Semin, B., Klotz, L., Godoy-Diana, R., Wesfreid, J. E., & Mullin,
T. (2021). Decay of streaks and rolls in plane Couette-Poiseuille flow. Journal
of Fluid Mechanics. Cambridge University Press. https://doi.org/10.1017/jfm.2021.89
chicago: Liu, T., B. Semin, Lukasz Klotz, R. Godoy-Diana, J. E. Wesfreid, and T.
Mullin. “Decay of Streaks and Rolls in Plane Couette-Poiseuille Flow.” Journal
of Fluid Mechanics. Cambridge University Press, 2021. https://doi.org/10.1017/jfm.2021.89.
ieee: T. Liu, B. Semin, L. Klotz, R. Godoy-Diana, J. E. Wesfreid, and T. Mullin,
“Decay of streaks and rolls in plane Couette-Poiseuille flow,” Journal of Fluid
Mechanics, vol. 915. Cambridge University Press, 2021.
ista: Liu T, Semin B, Klotz L, Godoy-Diana R, Wesfreid JE, Mullin T. 2021. Decay
of streaks and rolls in plane Couette-Poiseuille flow. Journal of Fluid Mechanics.
915, A65.
mla: Liu, T., et al. “Decay of Streaks and Rolls in Plane Couette-Poiseuille Flow.”
Journal of Fluid Mechanics, vol. 915, A65, Cambridge University Press,
2021, doi:10.1017/jfm.2021.89.
short: T. Liu, B. Semin, L. Klotz, R. Godoy-Diana, J.E. Wesfreid, T. Mullin, Journal
of Fluid Mechanics 915 (2021).
date_created: 2021-03-28T22:01:42Z
date_published: 2021-03-17T00:00:00Z
date_updated: 2023-08-07T14:30:11Z
day: '17'
department:
- _id: BjHo
doi: 10.1017/jfm.2021.89
external_id:
arxiv:
- '2008.08851'
isi:
- '000629677500001'
intvolume: ' 915'
isi: 1
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2008.08851
month: '03'
oa: 1
oa_version: Preprint
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
- 1469-7645
issn:
- 0022-1120
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Decay of streaks and rolls in plane Couette-Poiseuille flow
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 915
year: '2021'
...
---
_id: '9407'
abstract:
- lang: eng
text: 'High impact epidemics constitute one of the largest threats humanity is facing
in the 21st century. In the absence of pharmaceutical interventions, physical
distancing together with testing, contact tracing and quarantining are crucial
in slowing down epidemic dynamics. Yet, here we show that if testing capacities
are limited, containment may fail dramatically because such combined countermeasures
drastically change the rules of the epidemic transition: Instead of continuous,
the response to countermeasures becomes discontinuous. Rather than following the
conventional exponential growth, the outbreak that is initially strongly suppressed
eventually accelerates and scales faster than exponential during an explosive
growth period. As a consequence, containment measures either suffice to stop the
outbreak at low total case numbers or fail catastrophically if marginally too
weak, thus implying large uncertainties in reliably estimating overall epidemic
dynamics, both during initial phases and during second wave scenarios.'
acknowledgement: The authors thank Malte Schröder for valuable discussions and creating
the scale-free network topologies. B.H. thanks Mukund Vasudevan for helpful discussion.
The research by M.T. was supported by the Deutsche Forschungsgemeinschaft (DFG,
German Research Foundation) under Germany´s Excellence Strategy–EXC-2068–390729961–Cluster
of Excellence Physics of Life of TU Dresden.
article_number: '2586'
article_processing_charge: No
article_type: original
author:
- first_name: Davide
full_name: Scarselli, Davide
id: 40315C30-F248-11E8-B48F-1D18A9856A87
last_name: Scarselli
orcid: 0000-0001-5227-4271
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
- first_name: Marc
full_name: Timme, Marc
last_name: Timme
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Scarselli D, Budanur NB, Timme M, Hof B. Discontinuous epidemic transition
due to limited testing. Nature Communications. 2021;12(1). doi:10.1038/s41467-021-22725-9
apa: Scarselli, D., Budanur, N. B., Timme, M., & Hof, B. (2021). Discontinuous
epidemic transition due to limited testing. Nature Communications. Springer
Nature. https://doi.org/10.1038/s41467-021-22725-9
chicago: Scarselli, Davide, Nazmi B Budanur, Marc Timme, and Björn Hof. “Discontinuous
Epidemic Transition Due to Limited Testing.” Nature Communications. Springer
Nature, 2021. https://doi.org/10.1038/s41467-021-22725-9.
ieee: D. Scarselli, N. B. Budanur, M. Timme, and B. Hof, “Discontinuous epidemic
transition due to limited testing,” Nature Communications, vol. 12, no.
1. Springer Nature, 2021.
ista: Scarselli D, Budanur NB, Timme M, Hof B. 2021. Discontinuous epidemic transition
due to limited testing. Nature Communications. 12(1), 2586.
mla: Scarselli, Davide, et al. “Discontinuous Epidemic Transition Due to Limited
Testing.” Nature Communications, vol. 12, no. 1, 2586, Springer Nature,
2021, doi:10.1038/s41467-021-22725-9.
short: D. Scarselli, N.B. Budanur, M. Timme, B. Hof, Nature Communications 12 (2021).
date_created: 2021-05-23T22:01:42Z
date_published: 2021-05-10T00:00:00Z
date_updated: 2023-08-08T13:45:13Z
day: '10'
ddc:
- '570'
department:
- _id: BjHo
doi: 10.1038/s41467-021-22725-9
external_id:
isi:
- '000687305500044'
file:
- access_level: open_access
checksum: fe26c1b8a7da1ae07a6c03f80ff06ea1
content_type: application/pdf
creator: kschuh
date_created: 2021-05-25T14:18:40Z
date_updated: 2021-05-25T14:18:40Z
file_id: '9426'
file_name: 2021_NatureCommunications_Scarselli.pdf
file_size: 1176573
relation: main_file
success: 1
file_date_updated: 2021-05-25T14:18:40Z
has_accepted_license: '1'
intvolume: ' 12'
isi: 1
issue: '1'
language:
- iso: eng
month: '05'
oa: 1
oa_version: Published Version
publication: Nature Communications
publication_identifier:
eissn:
- '20411723'
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
related_material:
link:
- description: News on IST Homepage
relation: press_release
url: https://ist.ac.at/en/news/smashing-the-covid-curve/
scopus_import: '1'
status: public
title: Discontinuous epidemic transition due to limited testing
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 12
year: '2021'
...
---
_id: '9467'
abstract:
- lang: eng
text: "Turbulence in the flow of fluid through a pipe can be suppressed by buoyancy
forces. As the suppression of turbulence leads to severe heat transfer deterioration,
this is an important and undesirable phenomenon in both heating and cooling applications.
Vertical flow is often considered, as the axial buoyancy force can help drive
the flow. With heating measured by the buoyancy parameter \U0001D436, our direct
numerical simulations show that shear-driven turbulence may either be completely
laminarised or it transitions to a relatively quiescent convection-driven state.
Buoyancy forces cause a flattening of the base flow profile, which in isothermal
pipe flow has recently been linked to complete suppression of turbulence (Kühnen
et al., Nat. Phys., vol. 14, 2018, pp. 386–390), and the flattened laminar base
profile has enhanced nonlinear stability (Marensi et al., J. Fluid Mech., vol.
863, 2019, pp. 50–875). In agreement with these findings, the nonlinear lower-branch
travelling-wave solution analysed here, which is believed to mediate transition
to turbulence in isothermal pipe flow, is shown to be suppressed by buoyancy.
A linear instability of the laminar base flow is responsible for the appearance
of the relatively quiescent convection driven state for \U0001D436≳4 across the
range of Reynolds numbers considered. In the suppression of turbulence, however,
i.e. in the transition from turbulence, we find clearer association with the analysis
of He et al. (J. Fluid Mech., vol. 809, 2016, pp. 31–71) than with the above dynamical
systems approach, which describes better the transition to turbulence. The laminarisation
criterion He et al. propose, based on an apparent Reynolds number of the flow
as measured by its driving pressure gradient, is found to capture the critical
\U0001D436=\U0001D436\U0001D450\U0001D45F(\U0001D445\U0001D452) above which the
flow will be laminarised or switch to the convection-driven type. Our analysis
suggests that it is the weakened rolls, rather than the streaks, which appear
to be critical for laminarisation."
acknowledgement: The anonymous referees are kindly acknowledged for their useful suggestions
andcomments.
article_number: A17
article_processing_charge: Yes (via OA deal)
article_type: original
author:
- first_name: Elena
full_name: Marensi, Elena
id: 0BE7553A-1004-11EA-B805-18983DDC885E
last_name: Marensi
- first_name: Shuisheng
full_name: He, Shuisheng
last_name: He
- first_name: Ashley P.
full_name: Willis, Ashley P.
last_name: Willis
citation:
ama: Marensi E, He S, Willis AP. Suppression of turbulence and travelling waves
in a vertical heated pipe. Journal of Fluid Mechanics. 2021;919. doi:10.1017/jfm.2021.371
apa: Marensi, E., He, S., & Willis, A. P. (2021). Suppression of turbulence
and travelling waves in a vertical heated pipe. Journal of Fluid Mechanics.
Cambridge University Press. https://doi.org/10.1017/jfm.2021.371
chicago: Marensi, Elena, Shuisheng He, and Ashley P. Willis. “Suppression of Turbulence
and Travelling Waves in a Vertical Heated Pipe.” Journal of Fluid Mechanics.
Cambridge University Press, 2021. https://doi.org/10.1017/jfm.2021.371.
ieee: E. Marensi, S. He, and A. P. Willis, “Suppression of turbulence and travelling
waves in a vertical heated pipe,” Journal of Fluid Mechanics, vol. 919.
Cambridge University Press, 2021.
ista: Marensi E, He S, Willis AP. 2021. Suppression of turbulence and travelling
waves in a vertical heated pipe. Journal of Fluid Mechanics. 919, A17.
mla: Marensi, Elena, et al. “Suppression of Turbulence and Travelling Waves in a
Vertical Heated Pipe.” Journal of Fluid Mechanics, vol. 919, A17, Cambridge
University Press, 2021, doi:10.1017/jfm.2021.371.
short: E. Marensi, S. He, A.P. Willis, Journal of Fluid Mechanics 919 (2021).
date_created: 2021-06-06T22:01:30Z
date_published: 2021-07-25T00:00:00Z
date_updated: 2023-08-08T13:58:41Z
day: '25'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1017/jfm.2021.371
external_id:
arxiv:
- '2008.13486'
isi:
- '000653785000001'
file:
- access_level: open_access
checksum: 867ad077e45c181c2c5ec1311ba27c41
content_type: application/pdf
creator: kschuh
date_created: 2021-08-03T09:53:28Z
date_updated: 2021-08-03T09:53:28Z
file_id: '9766'
file_name: 2021_JournalFluidMechanics_Marensi.pdf
file_size: 4087358
relation: main_file
success: 1
file_date_updated: 2021-08-03T09:53:28Z
has_accepted_license: '1'
intvolume: ' 919'
isi: 1
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
publication: Journal of Fluid Mechanics
publication_identifier:
eissn:
- '14697645'
issn:
- '00221120'
publication_status: published
publisher: Cambridge University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: Suppression of turbulence and travelling waves in a vertical heated pipe
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 919
year: '2021'
...
---
_id: '9558'
abstract:
- lang: eng
text: "We show that turbulent dynamics that arise in simulations of the three-dimensional
Navier--Stokes equations in a triply-periodic domain under sinusoidal forcing
can be described as transient visits to the neighborhoods of unstable time-periodic
solutions. Based on this description, we reduce the original system with more
than 10^5 degrees of freedom to a 17-node Markov chain where each node corresponds
to the neighborhood of a periodic orbit. The model accurately reproduces long-term
averages of the system's observables as weighted sums over the periodic orbits.\r\n"
acknowledged_ssus:
- _id: ScienComp
acknowledgement: "We thank the referees for improving this Letter with their comments.
We acknowledge stimulating discussions with\r\nH. Edelsbrunner. This work was supported
by Grant No. 662960 from the Simons Foundation (B. H.). The numerical calculations
were performed at TUBITAK ULAKBIM High Performance and Grid Computing Center (TRUBA
resources) and IST Austria High Performance Computing cluster."
article_number: '244502'
article_processing_charge: No
article_type: letter_note
author:
- first_name: Gökhan
full_name: Yalniz, Gökhan
id: 66E74FA2-D8BF-11E9-8249-8DE2E5697425
last_name: Yalniz
orcid: 0000-0002-8490-9312
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
citation:
ama: Yalniz G, Hof B, Budanur NB. Coarse graining the state space of a turbulent
flow using periodic orbits. Physical Review Letters. 2021;126(24). doi:10.1103/PhysRevLett.126.244502
apa: Yalniz, G., Hof, B., & Budanur, N. B. (2021). Coarse graining the state
space of a turbulent flow using periodic orbits. Physical Review Letters.
American Physical Society. https://doi.org/10.1103/PhysRevLett.126.244502
chicago: Yalniz, Gökhan, Björn Hof, and Nazmi B Budanur. “Coarse Graining the State
Space of a Turbulent Flow Using Periodic Orbits.” Physical Review Letters.
American Physical Society, 2021. https://doi.org/10.1103/PhysRevLett.126.244502.
ieee: G. Yalniz, B. Hof, and N. B. Budanur, “Coarse graining the state space of
a turbulent flow using periodic orbits,” Physical Review Letters, vol.
126, no. 24. American Physical Society, 2021.
ista: Yalniz G, Hof B, Budanur NB. 2021. Coarse graining the state space of a turbulent
flow using periodic orbits. Physical Review Letters. 126(24), 244502.
mla: Yalniz, Gökhan, et al. “Coarse Graining the State Space of a Turbulent Flow
Using Periodic Orbits.” Physical Review Letters, vol. 126, no. 24, 244502,
American Physical Society, 2021, doi:10.1103/PhysRevLett.126.244502.
short: G. Yalniz, B. Hof, N.B. Budanur, Physical Review Letters 126 (2021).
date_created: 2021-06-16T15:45:36Z
date_published: 2021-06-18T00:00:00Z
date_updated: 2023-08-08T14:08:36Z
day: '18'
department:
- _id: GradSch
- _id: BjHo
doi: 10.1103/PhysRevLett.126.244502
external_id:
arxiv:
- '2007.02584'
isi:
- '000663310100008'
intvolume: ' 126'
isi: 1
issue: '24'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2007.02584
month: '06'
oa: 1
oa_version: Preprint
project:
- _id: 238598C6-32DE-11EA-91FC-C7463DDC885E
grant_number: '662960'
name: 'Revisiting the Turbulence Problem Using Statistical Mechanics: Experimental
Studies on Transitional and Turbulent Flows'
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
link:
- description: News on IST Homepage
relation: press_release
url: https://ist.ac.at/en/news/turbulent-flow-simplified/
status: public
title: Coarse graining the state space of a turbulent flow using periodic orbits
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 126
year: '2021'
...
---
_id: '10203'
abstract:
- lang: eng
text: Single photon emitters in atomically-thin semiconductors can be deterministically
positioned using strain induced by underlying nano-structures. Here, we couple
monolayer WSe2 to high-refractive-index gallium phosphide dielectric nano-antennas
providing both optical enhancement and monolayer deformation. For single photon
emitters formed on such nano-antennas, we find very low (femto-Joule) saturation
pulse energies and up to 104 times brighter photoluminescence than in WSe2 placed
on low-refractive-index SiO2 pillars. We show that the key to these observations
is the increase on average by a factor of 5 of the quantum efficiency of the emitters
coupled to the nano-antennas. This further allows us to gain new insights into
their photoluminescence dynamics, revealing the roles of the dark exciton reservoir
and Auger processes. We also find that the coherence time of such emitters is
limited by intrinsic dephasing processes. Our work establishes dielectric nano-antennas
as a platform for high-efficiency quantum light generation in monolayer semiconductors.
acknowledgement: L.S., P.G.Z., and A.I.T. thank the financial support of the European
Graphene Flagship Project under grant agreements 881603 and EPSRC grant EP/S030751/1.
L.S. and A.I.T. thank the European Union’s Horizon 2020 research and innovation
programme under ITN Spin-NANO Marie Sklodowska-Curie grant agreement no. 676108.
P.G.Z. and A.I.T. thank the European Union’s Horizon 2020 research and innovation
programme under ITN 4PHOTON Marie Sklodowska-Curie grant agreement no. 721394. J.C.,
S.A.M., and R.S. acknowledge funding by EPSRC (EP/P033369 and EP/M013812). C.L.P.,
A.J.B., A.I.T., and A.M.F. acknowledge funding by EPSRC Programme Grant EP/N031776/1.
S.A.M. acknowledges the Lee-Lucas Chair in Physics, the Solar Energies go Hybrid
(SolTech) programme, and the Deutsche Forschungsgemeinschaft (DFG, German Research
Foundation) under Germany’s Excellence Strategy - EXC 2089/1 - 390776260.
article_number: '6063'
article_processing_charge: No
article_type: original
author:
- first_name: Luca
full_name: Sortino, Luca
last_name: Sortino
- first_name: Panaiot G.
full_name: Zotev, Panaiot G.
last_name: Zotev
- first_name: Catherine L.
full_name: Phillips, Catherine L.
last_name: Phillips
- first_name: Alistair J.
full_name: Brash, Alistair J.
last_name: Brash
- first_name: Javier
full_name: Cambiasso, Javier
last_name: Cambiasso
- first_name: Elena
full_name: Marensi, Elena
id: 0BE7553A-1004-11EA-B805-18983DDC885E
last_name: Marensi
orcid: 0000-0001-7173-4923
- first_name: A. Mark
full_name: Fox, A. Mark
last_name: Fox
- first_name: Stefan A.
full_name: Maier, Stefan A.
last_name: Maier
- first_name: Riccardo
full_name: Sapienza, Riccardo
last_name: Sapienza
- first_name: Alexander I.
full_name: Tartakovskii, Alexander I.
last_name: Tartakovskii
citation:
ama: Sortino L, Zotev PG, Phillips CL, et al. Bright single photon emitters with
enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric
nano-antennas. Nature Communications. 2021;12. doi:10.1038/s41467-021-26262-3
apa: Sortino, L., Zotev, P. G., Phillips, C. L., Brash, A. J., Cambiasso, J., Marensi,
E., … Tartakovskii, A. I. (2021). Bright single photon emitters with enhanced
quantum efficiency in a two-dimensional semiconductor coupled with dielectric
nano-antennas. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-021-26262-3
chicago: Sortino, Luca, Panaiot G. Zotev, Catherine L. Phillips, Alistair J. Brash,
Javier Cambiasso, Elena Marensi, A. Mark Fox, Stefan A. Maier, Riccardo Sapienza,
and Alexander I. Tartakovskii. “Bright Single Photon Emitters with Enhanced Quantum
Efficiency in a Two-Dimensional Semiconductor Coupled with Dielectric Nano-Antennas.”
Nature Communications. Springer Nature, 2021. https://doi.org/10.1038/s41467-021-26262-3.
ieee: L. Sortino et al., “Bright single photon emitters with enhanced quantum
efficiency in a two-dimensional semiconductor coupled with dielectric nano-antennas,”
Nature Communications, vol. 12. Springer Nature, 2021.
ista: Sortino L, Zotev PG, Phillips CL, Brash AJ, Cambiasso J, Marensi E, Fox AM,
Maier SA, Sapienza R, Tartakovskii AI. 2021. Bright single photon emitters with
enhanced quantum efficiency in a two-dimensional semiconductor coupled with dielectric
nano-antennas. Nature Communications. 12, 6063.
mla: Sortino, Luca, et al. “Bright Single Photon Emitters with Enhanced Quantum
Efficiency in a Two-Dimensional Semiconductor Coupled with Dielectric Nano-Antennas.”
Nature Communications, vol. 12, 6063, Springer Nature, 2021, doi:10.1038/s41467-021-26262-3.
short: L. Sortino, P.G. Zotev, C.L. Phillips, A.J. Brash, J. Cambiasso, E. Marensi,
A.M. Fox, S.A. Maier, R. Sapienza, A.I. Tartakovskii, Nature Communications 12
(2021).
date_created: 2021-10-31T23:01:30Z
date_published: 2021-10-18T00:00:00Z
date_updated: 2023-08-14T08:12:12Z
day: '18'
ddc:
- '530'
department:
- _id: BjHo
doi: 10.1038/s41467-021-26262-3
external_id:
arxiv:
- '2103.16986'
isi:
- '000708601800015'
file:
- access_level: open_access
checksum: 8580d128389860f732028c521cd5949e
content_type: application/pdf
creator: cchlebak
date_created: 2021-11-03T11:31:24Z
date_updated: 2021-11-03T11:31:24Z
file_id: '10212'
file_name: 2021_NatComm_Sortino.pdf
file_size: 1434201
relation: main_file
success: 1
file_date_updated: 2021-11-03T11:31:24Z
has_accepted_license: '1'
intvolume: ' 12'
isi: 1
language:
- iso: eng
month: '10'
oa: 1
oa_version: Published Version
publication: Nature Communications
publication_identifier:
eissn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Bright single photon emitters with enhanced quantum efficiency in a two-dimensional
semiconductor coupled with dielectric nano-antennas
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 12
year: '2021'
...
---
_id: '10299'
abstract:
- lang: eng
text: Turbulence generally arises in shear flows if velocities and hence, inertial
forces are sufficiently large. In striking contrast, viscoelastic fluids can exhibit
disordered motion even at vanishing inertia. Intermediate between these cases,
a state of chaotic motion, “elastoinertial turbulence” (EIT), has been observed
in a narrow Reynolds number interval. We here determine the origin of EIT in experiments
and show that characteristic EIT structures can be detected across an unexpectedly
wide range of parameters. Close to onset, a pattern of chevron-shaped streaks
emerges in qualitative agreement with linear and weakly nonlinear theory. However,
in experiments, the dynamics remain weakly chaotic, and the instability can be
traced to far lower Reynolds numbers than permitted by theory. For increasing
inertia, the flow undergoes a transformation to a wall mode composed of inclined
near-wall streaks and shear layers. This mode persists to what is known as the
“maximum drag reduction limit,” and overall EIT is found to dominate viscoelastic
flows across more than three orders of magnitude in Reynolds number.
acknowledgement: We thank Y. Dubief, R. Kerswell, E. Marensi, V. Shankar, V. Steinberg,
and V. Terrapon for discussions and helpful comments. A.V. and B.H. acknowledge
funding from the Austrian Science Fund, grant I4188-N30, within the Deutsche Forschungsgemeinschaft
research unit FOR 2688.
article_number: e2102350118
article_processing_charge: No
article_type: original
author:
- first_name: George H
full_name: Choueiri, George H
id: 448BD5BC-F248-11E8-B48F-1D18A9856A87
last_name: Choueiri
- first_name: Jose M
full_name: Lopez Alonso, Jose M
id: 40770848-F248-11E8-B48F-1D18A9856A87
last_name: Lopez Alonso
orcid: 0000-0002-0384-2022
- first_name: Atul
full_name: Varshney, Atul
id: 2A2006B2-F248-11E8-B48F-1D18A9856A87
last_name: Varshney
orcid: 0000-0002-3072-5999
- first_name: Sarath
full_name: Sankar, Sarath
last_name: Sankar
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. Experimental observation
of the origin and structure of elastoinertial turbulence. Proceedings of the
National Academy of Sciences. 2021;118(45). doi:10.1073/pnas.2102350118
apa: Choueiri, G. H., Lopez Alonso, J. M., Varshney, A., Sankar, S., & Hof,
B. (2021). Experimental observation of the origin and structure of elastoinertial
turbulence. Proceedings of the National Academy of Sciences. National Academy
of Sciences. https://doi.org/10.1073/pnas.2102350118
chicago: Choueiri, George H, Jose M Lopez Alonso, Atul Varshney, Sarath Sankar,
and Björn Hof. “Experimental Observation of the Origin and Structure of Elastoinertial
Turbulence.” Proceedings of the National Academy of Sciences. National
Academy of Sciences, 2021. https://doi.org/10.1073/pnas.2102350118.
ieee: G. H. Choueiri, J. M. Lopez Alonso, A. Varshney, S. Sankar, and B. Hof, “Experimental
observation of the origin and structure of elastoinertial turbulence,” Proceedings
of the National Academy of Sciences, vol. 118, no. 45. National Academy of
Sciences, 2021.
ista: Choueiri GH, Lopez Alonso JM, Varshney A, Sankar S, Hof B. 2021. Experimental
observation of the origin and structure of elastoinertial turbulence. Proceedings
of the National Academy of Sciences. 118(45), e2102350118.
mla: Choueiri, George H., et al. “Experimental Observation of the Origin and Structure
of Elastoinertial Turbulence.” Proceedings of the National Academy of Sciences,
vol. 118, no. 45, e2102350118, National Academy of Sciences, 2021, doi:10.1073/pnas.2102350118.
short: G.H. Choueiri, J.M. Lopez Alonso, A. Varshney, S. Sankar, B. Hof, Proceedings
of the National Academy of Sciences 118 (2021).
date_created: 2021-11-17T13:24:24Z
date_published: 2021-11-03T00:00:00Z
date_updated: 2023-08-14T11:50:10Z
day: '03'
department:
- _id: BjHo
doi: 10.1073/pnas.2102350118
external_id:
arxiv:
- '2103.00023'
isi:
- '000720926900019'
pmid:
- ' 34732570'
intvolume: ' 118'
isi: 1
issue: '45'
keyword:
- multidisciplinary
- elastoinertial turbulence
- viscoelastic flows
- elastic instability
- drag reduction
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/2103.00023
month: '11'
oa: 1
oa_version: Preprint
pmid: 1
project:
- _id: 238B8092-32DE-11EA-91FC-C7463DDC885E
call_identifier: FWF
grant_number: I04188
name: Instabilities in pulsating pipe flow of Newtonian and complex fluids
publication: Proceedings of the National Academy of Sciences
publication_identifier:
eissn:
- 1091-6490
issn:
- 0027-8424
publication_status: published
publisher: National Academy of Sciences
quality_controlled: '1'
scopus_import: '1'
status: public
title: Experimental observation of the origin and structure of elastoinertial turbulence
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 118
year: '2021'
...
---
_id: '9728'
abstract:
- lang: eng
text: "Most real-world flows are multiphase, yet we know little about them compared
to their single-phase counterparts. Multiphase flows are more difficult to investigate
as their dynamics occur in large parameter space and involve complex phenomena
such as preferential concentration, turbulence modulation, non-Newtonian rheology,
etc. Over the last few decades, experiments in particle-laden flows have taken
a back seat in favour of ever-improving computational resources. However, computers
are still not powerful enough to simulate a real-world fluid with millions of
finite-size particles. Experiments are essential not only because they offer a
reliable way to investigate real-world multiphase flows but also because they
serve to validate numerical studies and steer the research in a relevant direction.
In this work, we have experimentally investigated particle-laden flows in pipes,
and in particular, examined the effect of particles on the laminar-turbulent transition
and the drag scaling in turbulent flows.\r\n\r\nFor particle-laden pipe flows,
an earlier study [Matas et al., 2003] reported how the sub-critical (i.e., hysteretic)
transition that occurs via localised turbulent structures called puffs is affected
by the addition of particles. In this study, in addition to this known transition,
we found a super-critical transition to a globally fluctuating state with increasing
particle concentration. At the same time, the Newtonian-type transition via puffs
is delayed to larger Reynolds numbers. At an even higher concentration, only the
globally fluctuating state is found. The dynamics of particle-laden flows are
hence determined by two competing instabilities that give rise to three flow regimes:
Newtonian-type turbulence at low, a particle-induced globally fluctuating state
at high, and a coexistence state at intermediate concentrations.\r\n\r\nThe effect
of particles on turbulent drag is ambiguous, with studies reporting drag reduction,
no net change, and even drag increase. The ambiguity arises because, in addition
to particle concentration, particle shape, size, and density also affect the net
drag. Even similar particles might affect the flow dissimilarly in different Reynolds
number and concentration ranges. In the present study, we explored a wide range
of both Reynolds number and concentration, using spherical as well as cylindrical
particles. We found that the spherical particles do not reduce drag while the
cylindrical particles are drag-reducing within a specific Reynolds number interval.
The interval strongly depends on the particle concentration and the relative size
of the pipe and particles. Within this interval, the magnitude of drag reduction
reaches a maximum. These drag reduction maxima appear to fall onto a distinct
power-law curve irrespective of the pipe diameter and particle concentration,
and this curve can be considered as the maximum drag reduction asymptote for a
given fibre shape. Such an asymptote is well known for polymeric flows but had
not been identified for particle-laden flows prior to this work."
acknowledged_ssus:
- _id: M-Shop
alternative_title:
- ISTA Thesis
article_processing_charge: No
author:
- first_name: Nishchal
full_name: Agrawal, Nishchal
id: 469E6004-F248-11E8-B48F-1D18A9856A87
last_name: Agrawal
citation:
ama: Agrawal N. Transition to turbulence and drag reduction in particle-laden pipe
flows. 2021. doi:10.15479/at:ista:9728
apa: Agrawal, N. (2021). Transition to turbulence and drag reduction in particle-laden
pipe flows. Institute of Science and Technology Austria. https://doi.org/10.15479/at:ista:9728
chicago: Agrawal, Nishchal. “Transition to Turbulence and Drag Reduction in Particle-Laden
Pipe Flows.” Institute of Science and Technology Austria, 2021. https://doi.org/10.15479/at:ista:9728.
ieee: N. Agrawal, “Transition to turbulence and drag reduction in particle-laden
pipe flows,” Institute of Science and Technology Austria, 2021.
ista: Agrawal N. 2021. Transition to turbulence and drag reduction in particle-laden
pipe flows. Institute of Science and Technology Austria.
mla: Agrawal, Nishchal. Transition to Turbulence and Drag Reduction in Particle-Laden
Pipe Flows. Institute of Science and Technology Austria, 2021, doi:10.15479/at:ista:9728.
short: N. Agrawal, Transition to Turbulence and Drag Reduction in Particle-Laden
Pipe Flows, Institute of Science and Technology Austria, 2021.
date_created: 2021-07-27T13:40:30Z
date_published: 2021-07-29T00:00:00Z
date_updated: 2024-02-28T13:14:39Z
day: '29'
ddc:
- '532'
degree_awarded: PhD
department:
- _id: GradSch
- _id: BjHo
doi: 10.15479/at:ista:9728
file:
- access_level: closed
checksum: 77436be3563a90435024307b1b5ee7e8
content_type: application/x-zip-compressed
creator: nagrawal
date_created: 2021-07-28T13:32:02Z
date_updated: 2022-07-29T22:30:05Z
embargo_to: open_access
file_id: '9744'
file_name: Transition to Turbulence and Drag Reduction in Particle-Laden Pipe Flows.zip
file_size: 22859658
relation: source_file
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checksum: 72a891d7daba85445c29b868c22575ed
content_type: application/pdf
creator: nagrawal
date_created: 2021-07-28T13:32:05Z
date_updated: 2022-07-29T22:30:05Z
embargo: 2022-07-28
file_id: '9745'
file_name: Transition to Turbulence and Drag Reduction in Particle-Laden Pipe Flows.pdf
file_size: 18658048
relation: main_file
file_date_updated: 2022-07-29T22:30:05Z
has_accepted_license: '1'
keyword:
- Drag Reduction
- Transition to Turbulence
- Multiphase Flows
- particle Laden Flows
- Complex Flows
- Experiments
- Fluid Dynamics
language:
- iso: eng
month: '07'
oa: 1
oa_version: Published Version
page: '118'
publication_identifier:
issn:
- 2663-337X
publication_status: published
publisher: Institute of Science and Technology Austria
related_material:
record:
- id: '6189'
relation: part_of_dissertation
status: public
status: public
supervisor:
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
title: Transition to turbulence and drag reduction in particle-laden pipe flows
tmp:
image: /images/cc_by.png
legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
short: CC BY (4.0)
type: dissertation
user_id: c635000d-4b10-11ee-a964-aac5a93f6ac1
year: '2021'
...
---
_id: '7364'
abstract:
- lang: eng
text: We present nsCouette, a highly scalable software tool to solve the Navier–Stokes
equations for incompressible fluid flow between differentially heated and independently
rotating, concentric cylinders. It is based on a pseudospectral spatial discretization
and dynamic time-stepping. It is implemented in modern Fortran with a hybrid MPI-OpenMP
parallelization scheme and thus designed to compute turbulent flows at high Reynolds
and Rayleigh numbers. An additional GPU implementation (C-CUDA) for intermediate
problem sizes and a version for pipe flow (nsPipe) are also provided.
article_number: '100395'
article_processing_charge: No
article_type: original
author:
- first_name: Jose M
full_name: Lopez Alonso, Jose M
id: 40770848-F248-11E8-B48F-1D18A9856A87
last_name: Lopez Alonso
orcid: 0000-0002-0384-2022
- first_name: Daniel
full_name: Feldmann, Daniel
last_name: Feldmann
- first_name: Markus
full_name: Rampp, Markus
last_name: Rampp
- first_name: Alberto
full_name: Vela-Martín, Alberto
last_name: Vela-Martín
- first_name: Liang
full_name: Shi, Liang
id: 374A3F1A-F248-11E8-B48F-1D18A9856A87
last_name: Shi
- first_name: Marc
full_name: Avila, Marc
last_name: Avila
citation:
ama: Lopez Alonso JM, Feldmann D, Rampp M, Vela-Martín A, Shi L, Avila M. nsCouette
– A high-performance code for direct numerical simulations of turbulent Taylor–Couette
flow. SoftwareX. 2020;11. doi:10.1016/j.softx.2019.100395
apa: Lopez Alonso, J. M., Feldmann, D., Rampp, M., Vela-Martín, A., Shi, L., &
Avila, M. (2020). nsCouette – A high-performance code for direct numerical simulations
of turbulent Taylor–Couette flow. SoftwareX. Elsevier. https://doi.org/10.1016/j.softx.2019.100395
chicago: Lopez Alonso, Jose M, Daniel Feldmann, Markus Rampp, Alberto Vela-Martín,
Liang Shi, and Marc Avila. “NsCouette – A High-Performance Code for Direct Numerical
Simulations of Turbulent Taylor–Couette Flow.” SoftwareX. Elsevier, 2020.
https://doi.org/10.1016/j.softx.2019.100395.
ieee: J. M. Lopez Alonso, D. Feldmann, M. Rampp, A. Vela-Martín, L. Shi, and M.
Avila, “nsCouette – A high-performance code for direct numerical simulations of
turbulent Taylor–Couette flow,” SoftwareX, vol. 11. Elsevier, 2020.
ista: Lopez Alonso JM, Feldmann D, Rampp M, Vela-Martín A, Shi L, Avila M. 2020.
nsCouette – A high-performance code for direct numerical simulations of turbulent
Taylor–Couette flow. SoftwareX. 11, 100395.
mla: Lopez Alonso, Jose M., et al. “NsCouette – A High-Performance Code for Direct
Numerical Simulations of Turbulent Taylor–Couette Flow.” SoftwareX, vol.
11, 100395, Elsevier, 2020, doi:10.1016/j.softx.2019.100395.
short: J.M. Lopez Alonso, D. Feldmann, M. Rampp, A. Vela-Martín, L. Shi, M. Avila,
SoftwareX 11 (2020).
date_created: 2020-01-26T23:00:35Z
date_published: 2020-01-17T00:00:00Z
date_updated: 2023-08-17T14:29:59Z
day: '17'
ddc:
- '000'
department:
- _id: BjHo
doi: 10.1016/j.softx.2019.100395
external_id:
arxiv:
- '1908.00587'
isi:
- '000552271200011'
file:
- access_level: open_access
checksum: 2af1a1a3cc33557b345145276f221668
content_type: application/pdf
creator: dernst
date_created: 2020-01-27T07:32:46Z
date_updated: 2020-07-14T12:47:56Z
file_id: '7365'
file_name: 2020_SoftwareX_Lopez.pdf
file_size: 679707
relation: main_file
file_date_updated: 2020-07-14T12:47:56Z
has_accepted_license: '1'
intvolume: ' 11'
isi: 1
language:
- iso: eng
month: '01'
oa: 1
oa_version: Published Version
publication: SoftwareX
publication_identifier:
eissn:
- '23527110'
publication_status: published
publisher: Elsevier
quality_controlled: '1'
scopus_import: '1'
status: public
title: nsCouette – A high-performance code for direct numerical simulations of turbulent
Taylor–Couette flow
tmp:
image: /images/cc_by_nc_nd.png
legal_code_url: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode
name: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
(CC BY-NC-ND 4.0)
short: CC BY-NC-ND (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 11
year: '2020'
...
---
_id: '7534'
abstract:
- lang: eng
text: 'In the past two decades, our understanding of the transition to turbulence
in shear flows with linearly stable laminar solutions has greatly improved. Regarding
the susceptibility of the laminar flow, two concepts have been particularly useful:
the edge states and the minimal seeds. In this nonlinear picture of the transition,
the basin boundary of turbulence is set by the edge state''s stable manifold and
this manifold comes closest in energy to the laminar equilibrium at the minimal
seed. We begin this paper by presenting numerical experiments in which three-dimensional
perturbations are too energetic to trigger turbulence in pipe flow but they do
lead to turbulence when their amplitude is reduced. We show that this seemingly
counterintuitive observation is in fact consistent with the fully nonlinear description
of the transition mediated by the edge state. In order to understand the physical
mechanisms behind this process, we measure the turbulent kinetic energy production
and dissipation rates as a function of the radial coordinate. Our main observation
is that the transition to turbulence relies on the energy amplification away from
the wall, as opposed to the turbulence itself, whose energy is predominantly produced
near the wall. This observation is further supported by the similar analyses on
the minimal seeds and the edge states. Furthermore, we show that the time evolution
of production-over-dissipation curves provides a clear distinction between the
different initial amplification stages of the transition to turbulence from the
minimal seed.'
article_number: '023903'
article_processing_charge: No
article_type: original
author:
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
- first_name: Elena
full_name: Marensi, Elena
last_name: Marensi
- first_name: Ashley P.
full_name: Willis, Ashley P.
last_name: Willis
- first_name: Björn
full_name: Hof, Björn
id: 3A374330-F248-11E8-B48F-1D18A9856A87
last_name: Hof
orcid: 0000-0003-2057-2754
citation:
ama: Budanur NB, Marensi E, Willis AP, Hof B. Upper edge of chaos and the energetics
of transition in pipe flow. Physical Review Fluids. 2020;5(2). doi:10.1103/physrevfluids.5.023903
apa: Budanur, N. B., Marensi, E., Willis, A. P., & Hof, B. (2020). Upper edge
of chaos and the energetics of transition in pipe flow. Physical Review Fluids.
American Physical Society. https://doi.org/10.1103/physrevfluids.5.023903
chicago: Budanur, Nazmi B, Elena Marensi, Ashley P. Willis, and Björn Hof. “Upper
Edge of Chaos and the Energetics of Transition in Pipe Flow.” Physical Review
Fluids. American Physical Society, 2020. https://doi.org/10.1103/physrevfluids.5.023903.
ieee: N. B. Budanur, E. Marensi, A. P. Willis, and B. Hof, “Upper edge of chaos
and the energetics of transition in pipe flow,” Physical Review Fluids,
vol. 5, no. 2. American Physical Society, 2020.
ista: Budanur NB, Marensi E, Willis AP, Hof B. 2020. Upper edge of chaos and the
energetics of transition in pipe flow. Physical Review Fluids. 5(2), 023903.
mla: Budanur, Nazmi B., et al. “Upper Edge of Chaos and the Energetics of Transition
in Pipe Flow.” Physical Review Fluids, vol. 5, no. 2, 023903, American
Physical Society, 2020, doi:10.1103/physrevfluids.5.023903.
short: N.B. Budanur, E. Marensi, A.P. Willis, B. Hof, Physical Review Fluids 5 (2020).
date_created: 2020-02-27T10:26:57Z
date_published: 2020-02-21T00:00:00Z
date_updated: 2023-08-18T06:44:46Z
day: '21'
department:
- _id: BjHo
doi: 10.1103/physrevfluids.5.023903
external_id:
arxiv:
- '1912.09270'
isi:
- '000515065100001'
intvolume: ' 5'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1912.09270
month: '02'
oa: 1
oa_version: Preprint
publication: Physical Review Fluids
publication_identifier:
issn:
- 2469-990X
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Upper edge of chaos and the energetics of transition in pipe flow
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 5
year: '2020'
...
---
_id: '7563'
abstract:
- lang: eng
text: "We introduce “state space persistence analysis” for deducing the symbolic
dynamics of time series data obtained from high-dimensional chaotic attractors.
To this end, we adapt a topological data analysis technique known as persistent
homology for the characterization of state space projections of chaotic trajectories
and periodic orbits. By comparing the shapes along a chaotic trajectory to those
of the periodic orbits, state space persistence analysis quantifies the shape
similarity of chaotic trajectory segments and periodic orbits. We demonstrate
the method by applying it to the three-dimensional Rössler system and a 30-dimensional
discretization of the Kuramoto–Sivashinsky partial differential equation in (1+1)
dimensions.\r\nOne way of studying chaotic attractors systematically is through
their symbolic dynamics, in which one partitions the state space into qualitatively
different regions and assigns a symbol to each such region.1–3 This yields a “coarse-grained”
state space of the system, which can then be reduced to a Markov chain encoding
all possible transitions between the states of the system. While it is possible
to obtain the symbolic dynamics of low-dimensional chaotic systems with standard
tools such as Poincaré maps, when applied to high-dimensional systems such as
turbulent flows, these tools alone are not sufficient to determine symbolic dynamics.4,5
In this paper, we develop “state space persistence analysis” and demonstrate that
it can be utilized to infer the symbolic dynamics in very high-dimensional settings."
article_number: '033109'
article_processing_charge: No
article_type: original
author:
- first_name: Gökhan
full_name: Yalniz, Gökhan
id: 66E74FA2-D8BF-11E9-8249-8DE2E5697425
last_name: Yalniz
orcid: 0000-0002-8490-9312
- first_name: Nazmi B
full_name: Budanur, Nazmi B
id: 3EA1010E-F248-11E8-B48F-1D18A9856A87
last_name: Budanur
orcid: 0000-0003-0423-5010
citation:
ama: Yalniz G, Budanur NB. Inferring symbolic dynamics of chaotic flows from persistence.
Chaos. 2020;30(3). doi:10.1063/1.5122969
apa: Yalniz, G., & Budanur, N. B. (2020). Inferring symbolic dynamics of chaotic
flows from persistence. Chaos. AIP Publishing. https://doi.org/10.1063/1.5122969
chicago: Yalniz, Gökhan, and Nazmi B Budanur. “Inferring Symbolic Dynamics of Chaotic
Flows from Persistence.” Chaos. AIP Publishing, 2020. https://doi.org/10.1063/1.5122969.
ieee: G. Yalniz and N. B. Budanur, “Inferring symbolic dynamics of chaotic flows
from persistence,” Chaos, vol. 30, no. 3. AIP Publishing, 2020.
ista: Yalniz G, Budanur NB. 2020. Inferring symbolic dynamics of chaotic flows from
persistence. Chaos. 30(3), 033109.
mla: Yalniz, Gökhan, and Nazmi B. Budanur. “Inferring Symbolic Dynamics of Chaotic
Flows from Persistence.” Chaos, vol. 30, no. 3, 033109, AIP Publishing,
2020, doi:10.1063/1.5122969.
short: G. Yalniz, N.B. Budanur, Chaos 30 (2020).
date_created: 2020-03-04T08:06:25Z
date_published: 2020-03-03T00:00:00Z
date_updated: 2023-08-18T06:47:16Z
day: '03'
department:
- _id: BjHo
doi: 10.1063/1.5122969
external_id:
arxiv:
- '1910.04584'
isi:
- '000519254800002'
intvolume: ' 30'
isi: 1
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1063/1.5122969
month: '03'
oa: 1
oa_version: Published Version
publication: Chaos
publication_identifier:
eissn:
- 1089-7682
issn:
- 1054-1500
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Inferring symbolic dynamics of chaotic flows from persistence
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 30
year: '2020'
...