[{"article_number":"12","citation":{"mla":"Varshney, Atul, et al. “Classical ‘Spin’ Filtering with Two Degrees of Freedom and Dissipation.” Few-Body Systems, vol. 65, 12, Springer Nature, 2024, doi:10.1007/s00601-024-01880-x.","apa":"Varshney, A., Ghazaryan, A., & Volosniev, A. (2024). Classical ‘spin’ filtering with two degrees of freedom and dissipation. Few-Body Systems. Springer Nature. https://doi.org/10.1007/s00601-024-01880-x","ama":"Varshney A, Ghazaryan A, Volosniev A. Classical ‘spin’ filtering with two degrees of freedom and dissipation. Few-Body Systems. 2024;65. doi:10.1007/s00601-024-01880-x","ieee":"A. Varshney, A. Ghazaryan, and A. Volosniev, “Classical ‘spin’ filtering with two degrees of freedom and dissipation,” Few-Body Systems, vol. 65. Springer Nature, 2024.","short":"A. Varshney, A. Ghazaryan, A. Volosniev, Few-Body Systems 65 (2024).","chicago":"Varshney, Atul, Areg Ghazaryan, and Artem Volosniev. “Classical ‘Spin’ Filtering with Two Degrees of Freedom and Dissipation.” Few-Body Systems. Springer Nature, 2024. https://doi.org/10.1007/s00601-024-01880-x.","ista":"Varshney A, Ghazaryan A, Volosniev A. 2024. Classical ‘spin’ filtering with two degrees of freedom and dissipation. Few-Body Systems. 65, 12."},"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","author":[{"last_name":"Varshney","orcid":"0000-0002-3072-5999","full_name":"Varshney, Atul","first_name":"Atul","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","full_name":"Ghazaryan, Areg","orcid":"0000-0001-9666-3543","last_name":"Ghazaryan"},{"full_name":"Volosniev, Artem","orcid":"0000-0003-0393-5525","last_name":"Volosniev","first_name":"Artem","id":"37D278BC-F248-11E8-B48F-1D18A9856A87"}],"external_id":{"arxiv":["2401.08454"]},"article_processing_charge":"Yes (via OA deal)","title":"Classical ‘spin’ filtering with two degrees of freedom and dissipation","acknowledgement":"We thank Mikhail Lemeshko and members of his group for many inspiring discussions; Alberto Cappellaro for comments on the manuscript.\r\nOpen access funding provided by Institute of Science and Technology (IST Austria).","publisher":"Springer Nature","quality_controlled":"1","oa":1,"has_accepted_license":"1","year":"2024","day":"17","publication":"Few-Body Systems","doi":"10.1007/s00601-024-01880-x","date_published":"2024-02-17T00:00:00Z","date_created":"2024-03-01T11:39:33Z","_id":"15045","type":"journal_article","article_type":"original","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"status":"public","keyword":["Atomic and Molecular Physics","and Optics"],"date_updated":"2024-03-04T07:08:16Z","ddc":["530"],"file_date_updated":"2024-03-04T07:07:10Z","department":[{"_id":"MiLe"}],"abstract":[{"lang":"eng","text":"Coupling of orbital motion to a spin degree of freedom gives rise to various transport phenomena in quantum systems that are beyond the standard paradigms of classical physics. Here, we discuss features of spin-orbit dynamics that can be visualized using a classical model with two coupled angular degrees of freedom. Specifically, we demonstrate classical ‘spin’ filtering through our model and show that the interplay between angular degrees of freedom and dissipation can lead to asymmetric ‘spin’ transport."}],"oa_version":"Published Version","scopus_import":"1","month":"02","intvolume":" 65","publication_identifier":{"issn":["1432-5411"]},"publication_status":"published","file":[{"content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"15049","checksum":"c4e08cc7bc756da69b1b36fda7bb92fb","success":1,"date_updated":"2024-03-04T07:07:10Z","file_size":436712,"creator":"dernst","date_created":"2024-03-04T07:07:10Z","file_name":"2024_FewBodySys_Varshney.pdf"}],"language":[{"iso":"eng"}],"volume":65,"license":"https://creativecommons.org/licenses/by/4.0/"},{"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","citation":{"mla":"Scarselli, Davide, et al. “Turbulence Suppression by Cardiac-Cycle-Inspired Driving of Pipe Flow.” Nature, vol. 621, no. 7977, Springer Nature, 2023, pp. 71–74, doi:10.1038/s41586-023-06399-5.","apa":"Scarselli, D., Lopez Alonso, J. M., Varshney, A., & Hof, B. (2023). Turbulence suppression by cardiac-cycle-inspired driving of pipe flow. Nature. Springer Nature. https://doi.org/10.1038/s41586-023-06399-5","ama":"Scarselli D, Lopez Alonso JM, Varshney A, Hof B. Turbulence suppression by cardiac-cycle-inspired driving of pipe flow. Nature. 2023;621(7977):71-74. doi:10.1038/s41586-023-06399-5","ieee":"D. Scarselli, J. M. Lopez Alonso, A. Varshney, and B. Hof, “Turbulence suppression by cardiac-cycle-inspired driving of pipe flow,” Nature, vol. 621, no. 7977. Springer Nature, pp. 71–74, 2023.","short":"D. Scarselli, J.M. Lopez Alonso, A. Varshney, B. Hof, Nature 621 (2023) 71–74.","chicago":"Scarselli, Davide, Jose M Lopez Alonso, Atul Varshney, and Björn Hof. “Turbulence Suppression by Cardiac-Cycle-Inspired Driving of Pipe Flow.” Nature. Springer Nature, 2023. https://doi.org/10.1038/s41586-023-06399-5.","ista":"Scarselli D, Lopez Alonso JM, Varshney A, Hof B. 2023. Turbulence suppression by cardiac-cycle-inspired driving of pipe flow. Nature. 621(7977), 71–74."},"title":"Turbulence suppression by cardiac-cycle-inspired driving of pipe flow","author":[{"last_name":"Scarselli","full_name":"Scarselli, Davide","orcid":"0000-0001-5227-4271","first_name":"Davide","id":"40315C30-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Jose M","id":"40770848-F248-11E8-B48F-1D18A9856A87","full_name":"Lopez Alonso, Jose M","orcid":"0000-0002-0384-2022","last_name":"Lopez Alonso"},{"first_name":"Atul","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","last_name":"Varshney","full_name":"Varshney, Atul","orcid":"0000-0002-3072-5999"},{"full_name":"Hof, Björn","orcid":"0000-0003-2057-2754","last_name":"Hof","first_name":"Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87"}],"external_id":{"pmid":["37673988"]},"article_processing_charge":"No","project":[{"_id":"238598C6-32DE-11EA-91FC-C7463DDC885E","name":"Revisiting the Turbulence Problem Using Statistical Mechanics: Experimental Studies on Transitional and Turbulent Flows","grant_number":"662960"},{"grant_number":"I04188","name":"Instabilities in pulsating pipe flow of Newtonian and complex fluids","_id":"238B8092-32DE-11EA-91FC-C7463DDC885E","call_identifier":"FWF"}],"day":"07","publication":"Nature","year":"2023","doi":"10.1038/s41586-023-06399-5","date_published":"2023-09-07T00:00:00Z","date_created":"2023-09-17T22:01:09Z","page":"71-74","acknowledgement":"We acknowledge the assistance of the Miba machine shop and the team of the ISTA-HPC cluster. We thank M. Quadrio for the discussions. The work was supported by the Simons Foundation (grant no. 662960) and by the Austrian Science Fund (grant no. I4188-N30), within Deutsche Forschungsgemeinschaft research unit FOR 2688.","quality_controlled":"1","publisher":"Springer Nature","date_updated":"2023-09-20T12:10:22Z","department":[{"_id":"BjHo"}],"_id":"14341","status":"public","article_type":"original","type":"journal_article","language":[{"iso":"eng"}],"publication_identifier":{"issn":["0028-0836"],"eissn":["1476-4687"]},"publication_status":"published","volume":621,"related_material":{"link":[{"relation":"press_release","url":"https://www.ista.ac.at/en/news/pumping-like-the-heart/","description":"News on ISTA website"}]},"issue":"7977","oa_version":"None","pmid":1,"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"ScienComp"}],"abstract":[{"lang":"eng","text":"Flows through pipes and channels are, in practice, almost always turbulent, and the multiscale eddying motion is responsible for a major part of the encountered friction losses and pumping costs1. Conversely, for pulsatile flows, in particular for aortic blood flow, turbulence levels remain low despite relatively large peak velocities. For aortic blood flow, high turbulence levels are intolerable as they would damage the shear-sensitive endothelial cell layer2,3,4,5. Here we show that turbulence in ordinary pipe flow is diminished if the flow is driven in a pulsatile mode that incorporates all the key features of the cardiac waveform. At Reynolds numbers comparable to those of aortic blood flow, turbulence is largely inhibited, whereas at much higher speeds, the turbulent drag is reduced by more than 25%. This specific operation mode is more efficient when compared with steady driving, which is the present situation for virtually all fluid transport processes ranging from heating circuits to water, gas and oil pipelines."}],"month":"09","intvolume":" 621","scopus_import":"1"},{"day":"03","publication":"Physical Review Fluids","isi":1,"year":"2022","date_published":"2022-08-03T00:00:00Z","doi":"10.1103/physrevfluids.7.l081301","date_created":"2023-01-16T10:02:40Z","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). ","quality_controlled":"1","publisher":"American Physical Society","oa":1,"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","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","short":"M.V. Kumar, A. Varshney, D. Li, V. Steinberg, Physical Review Fluids 7 (2022).","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.","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.","ista":"Kumar MV, Varshney A, Li D, Steinberg V. 2022. Relaminarization of elastic turbulence. Physical Review Fluids. 7(8), 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."},"title":"Relaminarization of elastic turbulence","author":[{"first_name":"M. Vijay","full_name":"Kumar, M. Vijay","last_name":"Kumar"},{"last_name":"Varshney","full_name":"Varshney, Atul","orcid":"0000-0002-3072-5999","first_name":"Atul","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Dongyang","last_name":"Li","full_name":"Li, Dongyang"},{"first_name":"Victor","last_name":"Steinberg","full_name":"Steinberg, Victor"}],"article_processing_charge":"No","external_id":{"arxiv":["2205.12871"],"isi":["000836397000001"]},"article_number":"L081301","language":[{"iso":"eng"}],"publication_identifier":{"issn":["2469-990X"]},"publication_status":"published","volume":7,"issue":"8","oa_version":"Preprint","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."}],"month":"08","intvolume":" 7","scopus_import":"1","main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2205.12871"}],"date_updated":"2023-08-04T10:26:40Z","department":[{"_id":"BjHo"}],"_id":"12279","status":"public","keyword":["Fluid Flow and Transfer Processes","Modeling and Simulation","Computational Mechanics"],"type":"journal_article","article_type":"original"},{"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.","oa":1,"publisher":"National Academy of Sciences","quality_controlled":"1","year":"2021","isi":1,"publication":"Proceedings of the National Academy of Sciences","day":"03","date_created":"2021-11-17T13:24:24Z","doi":"10.1073/pnas.2102350118","date_published":"2021-11-03T00:00:00Z","article_number":"e2102350118","project":[{"_id":"238B8092-32DE-11EA-91FC-C7463DDC885E","call_identifier":"FWF","grant_number":"I04188","name":"Instabilities in pulsating pipe flow of Newtonian and complex fluids"}],"citation":{"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.","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.","short":"G.H. Choueiri, J.M. Lopez Alonso, A. Varshney, S. Sankar, B. Hof, Proceedings of the National Academy of Sciences 118 (2021).","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","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."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","external_id":{"pmid":[" 34732570"],"isi":["000720926900019"],"arxiv":["2103.00023"]},"article_processing_charge":"No","author":[{"last_name":"Choueiri","full_name":"Choueiri, George H","first_name":"George H","id":"448BD5BC-F248-11E8-B48F-1D18A9856A87"},{"orcid":"0000-0002-0384-2022","full_name":"Lopez Alonso, Jose M","last_name":"Lopez Alonso","first_name":"Jose M","id":"40770848-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Atul","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","last_name":"Varshney","full_name":"Varshney, Atul","orcid":"0000-0002-3072-5999"},{"last_name":"Sankar","full_name":"Sankar, Sarath","first_name":"Sarath"},{"first_name":"Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn","last_name":"Hof"}],"title":"Experimental observation of the origin and structure of elastoinertial turbulence","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."}],"pmid":1,"oa_version":"Preprint","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2103.00023"}],"scopus_import":"1","intvolume":" 118","month":"11","publication_status":"published","publication_identifier":{"issn":["0027-8424"],"eissn":["1091-6490"]},"language":[{"iso":"eng"}],"issue":"45","volume":118,"_id":"10299","article_type":"original","type":"journal_article","keyword":["multidisciplinary","elastoinertial turbulence","viscoelastic flows","elastic instability","drag reduction"],"status":"public","date_updated":"2023-08-14T11:50:10Z","department":[{"_id":"BjHo"}]},{"scopus_import":"1","main_file_link":[{"url":"https://arxiv.org/abs/2005.11190","open_access":"1"}],"month":"05","intvolume":" 117","abstract":[{"text":"Pulsating flows through tubular geometries are laminar provided that velocities are moderate. This in particular is also believed to apply to cardiovascular flows where inertial forces are typically too low to sustain turbulence. On the other hand, flow instabilities and fluctuating shear stresses are held responsible for a variety of cardiovascular diseases. Here we report a nonlinear instability mechanism for pulsating pipe flow that gives rise to bursts of turbulence at low flow rates. Geometrical distortions of small, yet finite, amplitude are found to excite a state consisting of helical vortices during flow deceleration. The resulting flow pattern grows rapidly in magnitude, breaks down into turbulence, and eventually returns to laminar when the flow accelerates. This scenario causes shear stress fluctuations and flow reversal during each pulsation cycle. Such unsteady conditions can adversely affect blood vessels and have been shown to promote inflammation and dysfunction of the shear stress-sensitive endothelial cell layer.","lang":"eng"}],"oa_version":"Preprint","volume":117,"issue":"21","related_material":{"record":[{"id":"12726","status":"public","relation":"dissertation_contains"},{"status":"public","id":"14530","relation":"dissertation_contains"}],"link":[{"description":"News on IST Homepage","url":"https://ist.ac.at/en/news/blood-flows-more-turbulent-than-previously-expected/","relation":"press_release"}]},"ec_funded":1,"publication_identifier":{"eissn":["10916490"],"issn":["00278424"]},"publication_status":"published","language":[{"iso":"eng"}],"article_type":"original","type":"journal_article","status":"public","_id":"7932","department":[{"_id":"BjHo"}],"date_updated":"2023-11-30T10:55:13Z","publisher":"National Academy of Sciences","quality_controlled":"1","oa":1,"page":"11233-11239","doi":"10.1073/pnas.1913716117","date_published":"2020-05-26T00:00:00Z","date_created":"2020-06-07T22:00:51Z","isi":1,"year":"2020","day":"26","publication":"Proceedings of the National Academy of Sciences of the United States of America","project":[{"_id":"238B8092-32DE-11EA-91FC-C7463DDC885E","call_identifier":"FWF","name":"Instabilities in pulsating pipe flow of Newtonian and complex fluids","grant_number":"I04188"},{"call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","grant_number":"754411","name":"ISTplus - Postdoctoral Fellowships"}],"author":[{"full_name":"Xu, Duo","last_name":"Xu","id":"3454D55E-F248-11E8-B48F-1D18A9856A87","first_name":"Duo"},{"id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","first_name":"Atul","full_name":"Varshney, Atul","orcid":"0000-0002-3072-5999","last_name":"Varshney"},{"first_name":"Xingyu","id":"34BADBA6-F248-11E8-B48F-1D18A9856A87","last_name":"Ma","full_name":"Ma, Xingyu","orcid":"0000-0002-0179-9737"},{"last_name":"Song","full_name":"Song, Baofang","first_name":"Baofang"},{"full_name":"Riedl, Michael","orcid":"0000-0003-4844-6311","last_name":"Riedl","id":"3BE60946-F248-11E8-B48F-1D18A9856A87","first_name":"Michael"},{"last_name":"Avila","full_name":"Avila, Marc","first_name":"Marc"},{"first_name":"Björn","id":"3A374330-F248-11E8-B48F-1D18A9856A87","last_name":"Hof","orcid":"0000-0003-2057-2754","full_name":"Hof, Björn"}],"article_processing_charge":"No","external_id":{"arxiv":["2005.11190"],"isi":["000536797100014"]},"title":"Nonlinear hydrodynamic instability and turbulence in pulsatile flow","citation":{"ista":"Xu D, Varshney A, Ma X, Song B, Riedl M, Avila M, Hof B. 2020. Nonlinear hydrodynamic instability and turbulence in pulsatile flow. Proceedings of the National Academy of Sciences of the United States of America. 117(21), 11233–11239.","chicago":"Xu, Duo, Atul Varshney, Xingyu Ma, Baofang Song, Michael Riedl, Marc Avila, and Björn Hof. “Nonlinear Hydrodynamic Instability and Turbulence in Pulsatile Flow.” Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences, 2020. https://doi.org/10.1073/pnas.1913716117.","apa":"Xu, D., Varshney, A., Ma, X., Song, B., Riedl, M., Avila, M., & Hof, B. (2020). Nonlinear hydrodynamic instability and turbulence in pulsatile flow. Proceedings of the National Academy of Sciences of the United States of America. National Academy of Sciences. https://doi.org/10.1073/pnas.1913716117","ama":"Xu D, Varshney A, Ma X, et al. Nonlinear hydrodynamic instability and turbulence in pulsatile flow. Proceedings of the National Academy of Sciences of the United States of America. 2020;117(21):11233-11239. doi:10.1073/pnas.1913716117","short":"D. Xu, A. Varshney, X. Ma, B. Song, M. Riedl, M. Avila, B. Hof, Proceedings of the National Academy of Sciences of the United States of America 117 (2020) 11233–11239.","ieee":"D. Xu et al., “Nonlinear hydrodynamic instability and turbulence in pulsatile flow,” Proceedings of the National Academy of Sciences of the United States of America, vol. 117, no. 21. National Academy of Sciences, pp. 11233–11239, 2020.","mla":"Xu, Duo, et al. “Nonlinear Hydrodynamic Instability and Turbulence in Pulsatile Flow.” Proceedings of the National Academy of Sciences of the United States of America, vol. 117, no. 21, National Academy of Sciences, 2020, pp. 11233–39, doi:10.1073/pnas.1913716117."},"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8"},{"oa":1,"publisher":"Springer Nature","quality_controlled":"1","publication":"Nature Communications","day":"26","year":"2019","isi":1,"has_accepted_license":"1","date_created":"2019-03-05T13:18:30Z","doi":"10.1038/s41467-019-08916-5","date_published":"2019-02-26T00:00:00Z","article_number":"937","project":[{"call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","grant_number":"754411","name":"ISTplus - Postdoctoral Fellowships"}],"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"apa":"Mayzel, J., Steinberg, V., & Varshney, A. (2019). Stokes flow analogous to viscous electron current in graphene. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-019-08916-5","ama":"Mayzel J, Steinberg V, Varshney A. Stokes flow analogous to viscous electron current in graphene. Nature Communications. 2019;10. doi:10.1038/s41467-019-08916-5","ieee":"J. Mayzel, V. Steinberg, and A. Varshney, “Stokes flow analogous to viscous electron current in graphene,” Nature Communications, vol. 10. Springer Nature, 2019.","short":"J. Mayzel, V. Steinberg, A. Varshney, Nature Communications 10 (2019).","mla":"Mayzel, Jonathan, et al. “Stokes Flow Analogous to Viscous Electron Current in Graphene.” Nature Communications, vol. 10, 937, Springer Nature, 2019, doi:10.1038/s41467-019-08916-5.","ista":"Mayzel J, Steinberg V, Varshney A. 2019. Stokes flow analogous to viscous electron current in graphene. Nature Communications. 10, 937.","chicago":"Mayzel, Jonathan, Victor Steinberg, and Atul Varshney. “Stokes Flow Analogous to Viscous Electron Current in Graphene.” Nature Communications. Springer Nature, 2019. https://doi.org/10.1038/s41467-019-08916-5."},"title":"Stokes flow analogous to viscous electron current in graphene","external_id":{"isi":["000459704600001"]},"article_processing_charge":"No","author":[{"last_name":"Mayzel","full_name":"Mayzel, Jonathan","first_name":"Jonathan"},{"last_name":"Steinberg","full_name":"Steinberg, Victor","first_name":"Victor"},{"last_name":"Varshney","full_name":"Varshney, Atul","orcid":"0000-0002-3072-5999","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","first_name":"Atul"}],"oa_version":"Published Version","abstract":[{"lang":"eng","text":"Electron transport in two-dimensional conducting materials such as graphene, with dominant electron–electron interaction, exhibits unusual vortex flow that leads to a nonlocal current-field relation (negative resistance), distinct from the classical Ohm’s law. The transport behavior of these materials is best described by low Reynolds number hydrodynamics, where the constitutive pressure–speed relation is Stoke’s law. Here we report evidence of such vortices observed in a viscous flow of Newtonian fluid in a microfluidic device consisting of a rectangular cavity—analogous to the electronic system. We extend our experimental observations to elliptic cavities of different eccentricities, and validate them by numerically solving bi-harmonic equation obtained for the viscous flow with no-slip boundary conditions. We verify the existence of a predicted threshold at which vortices appear. Strikingly, we find that a two-dimensional theoretical model captures the essential features of three-dimensional Stokes flow in experiments."}],"intvolume":" 10","month":"02","scopus_import":"1","language":[{"iso":"eng"}],"file":[{"creator":"dernst","file_size":2646391,"date_updated":"2020-07-14T12:47:18Z","file_name":"2019_NatureComm_Mayzel.pdf","date_created":"2019-03-05T13:33:04Z","relation":"main_file","access_level":"open_access","content_type":"application/pdf","checksum":"61192fc49e0d44907c2a4fe384e4b97f","file_id":"6070"}],"publication_status":"published","publication_identifier":{"issn":["2041-1723"]},"ec_funded":1,"volume":10,"_id":"6069","status":"public","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"type":"journal_article","ddc":["530","532"],"date_updated":"2023-09-08T11:39:02Z","department":[{"_id":"BjHo"}],"file_date_updated":"2020-07-14T12:47:18Z"},{"author":[{"last_name":"Varshney","full_name":"Varshney, Atul","orcid":"0000-0002-3072-5999","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","first_name":"Atul"},{"first_name":"Victor","last_name":"Steinberg","full_name":"Steinberg, Victor"}],"article_processing_charge":"No","external_id":{"isi":["000458175300001"],"arxiv":["1902.03763"]},"title":"Elastic alfven waves in elastic turbulence","citation":{"ista":"Varshney A, Steinberg V. 2019. Elastic alfven waves in elastic turbulence. Nature Communications. 10, 652.","chicago":"Varshney, Atul, and Victor Steinberg. “Elastic Alfven Waves in Elastic Turbulence.” Nature Communications. Springer Nature, 2019. https://doi.org/10.1038/s41467-019-08551-0.","apa":"Varshney, A., & Steinberg, V. (2019). Elastic alfven waves in elastic turbulence. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-019-08551-0","ama":"Varshney A, Steinberg V. Elastic alfven waves in elastic turbulence. Nature Communications. 2019;10. doi:10.1038/s41467-019-08551-0","short":"A. Varshney, V. Steinberg, Nature Communications 10 (2019).","ieee":"A. Varshney and V. Steinberg, “Elastic alfven waves in elastic turbulence,” Nature Communications, vol. 10. Springer Nature, 2019.","mla":"Varshney, Atul, and Victor Steinberg. “Elastic Alfven Waves in Elastic Turbulence.” Nature Communications, vol. 10, 652, Springer Nature, 2019, doi:10.1038/s41467-019-08551-0."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","project":[{"grant_number":"754411","name":"ISTplus - Postdoctoral Fellowships","_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"article_number":"652","date_published":"2019-02-08T00:00:00Z","doi":"10.1038/s41467-019-08551-0","date_created":"2019-02-15T07:10:46Z","has_accepted_license":"1","isi":1,"year":"2019","day":"08","publication":"Nature Communications","publisher":"Springer Nature","quality_controlled":"1","oa":1,"file_date_updated":"2020-07-14T12:47:17Z","department":[{"_id":"BjHo"}],"date_updated":"2023-09-08T11:39:54Z","ddc":["530"],"article_type":"original","type":"journal_article","tmp":{"legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","image":"/images/cc_by.png","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)"},"status":"public","_id":"6014","volume":10,"ec_funded":1,"publication_identifier":{"issn":["2041-1723"]},"publication_status":"published","file":[{"date_updated":"2020-07-14T12:47:17Z","file_size":1331490,"creator":"dernst","date_created":"2019-02-15T07:15:00Z","file_name":"2019_NatureComm_Varshney.pdf","content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"6015","checksum":"d3acf07eaad95ec040d8e8565fc9ac37"}],"language":[{"iso":"eng"}],"scopus_import":"1","month":"02","intvolume":" 10","abstract":[{"lang":"eng","text":"Speed of sound waves in gases and liquids are governed by the compressibility of the medium. There exists another type of non-dispersive wave where the wave speed depends on stress instead of elasticity of the medium. A well-known example is the Alfven wave, which propagates through plasma permeated by a magnetic field with the speed determined by magnetic tension. An elastic analogue of Alfven waves has been predicted in a flow of dilute polymer solution where the elastic stress of the stretching polymers determines the elastic wave speed. Here we present quantitative evidence of elastic Alfven waves in elastic turbulence of a viscoelastic creeping flow between two obstacles in channel flow. The key finding in the experimental proof is a nonlinear dependence of the elastic wave speed cel on the Weissenberg number Wi, which deviates from predictions based on a model of linear polymer elasticity."}],"oa_version":"Published Version"},{"doi":"10.1103/PhysRevFluids.3.103302","date_published":"2018-10-15T00:00:00Z","date_created":"2018-12-11T11:44:11Z","isi":1,"has_accepted_license":"1","year":"2018","day":"15","publication":"Physical Review Fluids","publisher":"American Physical Society","quality_controlled":"1","oa":1,"author":[{"first_name":"Atul","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-3072-5999","full_name":"Varshney, Atul","last_name":"Varshney"},{"full_name":"Steinberg, Victor","last_name":"Steinberg","first_name":"Victor"}],"publist_id":"8038","external_id":{"isi":["000447311500001"]},"article_processing_charge":"No","title":"Drag enhancement and drag reduction in viscoelastic flow","citation":{"mla":"Varshney, Atul, and Victor Steinberg. “Drag Enhancement and Drag Reduction in Viscoelastic Flow.” Physical Review Fluids, vol. 3, no. 10, 103302, American Physical Society, 2018, doi:10.1103/PhysRevFluids.3.103302.","ama":"Varshney A, Steinberg V. Drag enhancement and drag reduction in viscoelastic flow. Physical Review Fluids. 2018;3(10). doi:10.1103/PhysRevFluids.3.103302","apa":"Varshney, A., & Steinberg, V. (2018). Drag enhancement and drag reduction in viscoelastic flow. Physical Review Fluids. American Physical Society. https://doi.org/10.1103/PhysRevFluids.3.103302","ieee":"A. Varshney and V. Steinberg, “Drag enhancement and drag reduction in viscoelastic flow,” Physical Review Fluids, vol. 3, no. 10. American Physical Society, 2018.","short":"A. Varshney, V. Steinberg, Physical Review Fluids 3 (2018).","chicago":"Varshney, Atul, and Victor Steinberg. “Drag Enhancement and Drag Reduction in Viscoelastic Flow.” Physical Review Fluids. American Physical Society, 2018. https://doi.org/10.1103/PhysRevFluids.3.103302.","ista":"Varshney A, Steinberg V. 2018. Drag enhancement and drag reduction in viscoelastic flow. Physical Review Fluids. 3(10), 103302."},"user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","project":[{"name":"ISTplus - Postdoctoral Fellowships","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020"}],"article_number":"103302 ","volume":3,"issue":"10","ec_funded":1,"publication_status":"published","file":[{"date_updated":"2020-07-14T12:45:12Z","file_size":1409040,"creator":"system","date_created":"2018-12-12T10:10:14Z","file_name":"IST-2018-1061-v1+1_PhysRevFluids.3.103302.pdf","content_type":"application/pdf","access_level":"open_access","relation":"main_file","file_id":"4800","checksum":"e1445be33e8165114e96246275600750"}],"language":[{"iso":"eng"}],"scopus_import":"1","month":"10","intvolume":" 3","abstract":[{"text":"Creeping flow of polymeric fluid without inertia exhibits elastic instabilities and elastic turbulence accompanied by drag enhancement due to elastic stress produced by flow-stretched polymers. However, in inertia-dominated flow at high Re and low fluid elasticity El, a reduction in turbulent frictional drag is caused by an intricate competition between inertial and elastic stresses. Here we explore the effect of inertia on the stability of viscoelastic flow in a broad range of control parameters El and (Re,Wi). We present the stability diagram of observed flow regimes in Wi-Re coordinates and find that the instabilities' onsets show an unexpectedly nonmonotonic dependence on El. Further, three distinct regions in the diagram are identified based on El. Strikingly, for high-elasticity fluids we discover a complete relaminarization of flow at Reynolds number in the range of 1 to 10, different from a well-known turbulent drag reduction. These counterintuitive effects may be explained by a finite polymer extensibility and a suppression of vorticity at high Wi. Our results call for further theoretical and numerical development to uncover the role of inertial effect on elastic turbulence in a viscoelastic flow.","lang":"eng"}],"oa_version":"Published Version","file_date_updated":"2020-07-14T12:45:12Z","department":[{"_id":"BjHo"}],"date_updated":"2023-09-11T12:59:28Z","ddc":["532"],"type":"journal_article","status":"public","pubrep_id":"1061","_id":"17"},{"intvolume":" 3","month":"10","scopus_import":"1","oa_version":"Submitted Version","abstract":[{"lang":"eng","text":"We report quantitative evidence of mixing-layer elastic instability in a viscoelastic fluid flow between two widely spaced obstacles hindering a channel flow at Re 1 and Wi 1. Two mixing layers with nonuniform shear velocity profiles are formed in the region between the obstacles. The mixing-layer instability arises in the vicinity of an inflection point on the shear velocity profile with a steep variation in the elastic stress. The instability results in an intermittent appearance of small vortices in the mixing layers and an amplification of spatiotemporal averaged vorticity in the elastic turbulence regime. The latter is characterized through scaling of friction factor with Wi and both pressure and velocity spectra. Furthermore, the observations reported provide improved understanding of the stability of the mixing layer in a viscoelastic fluid at large elasticity, i.e., Wi 1 and Re 1 and oppose the current view of suppression of vorticity solely by polymer additives."}],"ec_funded":1,"issue":"10","volume":3,"language":[{"iso":"eng"}],"file":[{"file_name":"IST-2018-1062-v1+1_PhysRevFluids.3.103303.pdf","date_created":"2018-12-12T10:13:56Z","creator":"system","file_size":1838431,"date_updated":"2020-07-14T12:45:04Z","file_id":"5043","checksum":"7fc0a2322214d1c04debef36d5bf2e8a","relation":"main_file","access_level":"open_access","content_type":"application/pdf"}],"publication_status":"published","pubrep_id":"1062","status":"public","type":"journal_article","article_type":"original","_id":"16","department":[{"_id":"BjHo"}],"file_date_updated":"2020-07-14T12:45:04Z","ddc":["532"],"date_updated":"2023-09-13T08:57:05Z","oa":1,"quality_controlled":"1","publisher":"American Physical Society","acknowledgement":"This work was partially supported by the Israel Science Foundation (ISF; Grant No. 882/15) and the Binational USA-Israel Foundation (BSF; Grant No. 2016145).","date_created":"2018-12-11T11:44:10Z","date_published":"2018-10-16T00:00:00Z","doi":"10.1103/PhysRevFluids.3.103303","publication":"Physical Review Fluids","day":"16","year":"2018","has_accepted_license":"1","isi":1,"project":[{"_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"754411","name":"ISTplus - Postdoctoral Fellowships"}],"article_number":"103303","title":"Mixing layer instability and vorticity amplification in a creeping viscoelastic flow","article_processing_charge":"No","external_id":{"isi":["000447469200001"]},"author":[{"full_name":"Varshney, Atul","orcid":"0000-0002-3072-5999","last_name":"Varshney","id":"2A2006B2-F248-11E8-B48F-1D18A9856A87","first_name":"Atul"},{"first_name":"Victor","last_name":"Steinberg","full_name":"Steinberg, Victor"}],"publist_id":"8039","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","citation":{"mla":"Varshney, Atul, and Victor Steinberg. “Mixing Layer Instability and Vorticity Amplification in a Creeping Viscoelastic Flow.” Physical Review Fluids, vol. 3, no. 10, 103303, American Physical Society, 2018, doi:10.1103/PhysRevFluids.3.103303.","apa":"Varshney, A., & Steinberg, V. (2018). Mixing layer instability and vorticity amplification in a creeping viscoelastic flow. Physical Review Fluids. American Physical Society. https://doi.org/10.1103/PhysRevFluids.3.103303","ama":"Varshney A, Steinberg V. Mixing layer instability and vorticity amplification in a creeping viscoelastic flow. Physical Review Fluids. 2018;3(10). doi:10.1103/PhysRevFluids.3.103303","ieee":"A. Varshney and V. Steinberg, “Mixing layer instability and vorticity amplification in a creeping viscoelastic flow,” Physical Review Fluids, vol. 3, no. 10. American Physical Society, 2018.","short":"A. Varshney, V. Steinberg, Physical Review Fluids 3 (2018).","chicago":"Varshney, Atul, and Victor Steinberg. “Mixing Layer Instability and Vorticity Amplification in a Creeping Viscoelastic Flow.” Physical Review Fluids. American Physical Society, 2018. https://doi.org/10.1103/PhysRevFluids.3.103303.","ista":"Varshney A, Steinberg V. 2018. Mixing layer instability and vorticity amplification in a creeping viscoelastic flow. Physical Review Fluids. 3(10), 103303."}}]