Song, Baofang; Barkley, Dwight; Hof, BjörnIST Austria ; Avila, Marc
Using extensive direct numerical simulations, the dynamics of laminar-turbulent fronts in pipe flow is investigated for Reynolds numbers between and 5500. We here investigate the physical distinction between the fronts of weak and strong slugs both by analysing the turbulent kinetic energy budget and by comparing the downstream front motion to the advection speed of bulk turbulent structures. Our study shows that weak downstream fronts travel slower than turbulent structures in the bulk and correspond to decaying turbulence at the front. At the downstream front speed becomes faster than the advection speed, marking the onset of strong fronts. In contrast to weak fronts, turbulent eddies are generated at strong fronts by feeding on the downstream laminar flow. Our study also suggests that temporal fluctuations of production and dissipation at the downstream laminar-turbulent front drive the dynamical switches between the two types of front observed up to.
Journal of Fluid Mechanics
1045 - 1059
Song B, Barkley D, Hof B, Avila M. Speed and structure of turbulent fronts in pipe flow. Journal of Fluid Mechanics. 2017;813:1045-1059. doi:10.1017/jfm.2017.14
Song, B., Barkley, D., Hof, B., & Avila, M. (2017). Speed and structure of turbulent fronts in pipe flow. Journal of Fluid Mechanics, 813, 1045–1059. https://doi.org/10.1017/jfm.2017.14
Song, Baofang, Dwight Barkley, Björn Hof, and Marc Avila. “Speed and Structure of Turbulent Fronts in Pipe Flow.” Journal of Fluid Mechanics 813 (2017): 1045–59. https://doi.org/10.1017/jfm.2017.14.
B. Song, D. Barkley, B. Hof, and M. Avila, “Speed and structure of turbulent fronts in pipe flow,” Journal of Fluid Mechanics, vol. 813, pp. 1045–1059, 2017.
Song B, Barkley D, Hof B, Avila M. 2017. Speed and structure of turbulent fronts in pipe flow. Journal of Fluid Mechanics. 813, 1045–1059.
Song, Baofang, et al. “Speed and Structure of Turbulent Fronts in Pipe Flow.” Journal of Fluid Mechanics, vol. 813, Cambridge University Press, 2017, pp. 1045–59, doi:10.1017/jfm.2017.14.