Paul Manneville. On the decay of turbulence in plane Couette flow
Natural Sciences / Physics / Fluid Dynamics
Submitted on: Sep 17, 2012, 19:05:26
Description: The decay of turbulent and laminar oblique bands in the lower transitional range of plane Couette flow is studied by means of direct numerical simulations of the Navier--Stokes equations. We consider systems that are extended enough for several bands to exist, thanks to mild wall-normal under-resolution considered as a consistent and well-validated modelling strategy. We point out a two-stage process involving the rupture of a band followed by a slow regression of the fragments left. Previous approaches to turbulence decay in wall-bounded flows making use of the chaotic transient paradigm are reinterpreted within a spatiotemporal perspective in terms of large deviations of an underlying stochastic process. *** Journal reference: ETC13 Conference Proceedings ***