Turbulence stripe in transitional channel flow with/without system rotation

Authors: Tsukahara, T, Kawaguchi, Y, Kawamura, H, Tillmark, N.T., Alfredsson, P.H.
Document Type: Conference
Pubstate: Published
Journal: Proceedings of the Seventh IUTAM Symposium on Laminar-Turbulent Transition, Stockholm, Sweden, 2009
Volume:    421-426
Year: 2010


We report direct numerical simulations and experiments conducted in two types of plane channel flows plane Poiseuille flow and plane Couette flows without/with system rotation considering the subcritical-transition regime with using large aspect-ratio computational domains and channels Both flows give rise to coexisting laminar and turbulent equilibrium regions in the form of oblique stripes, which are tilted by a certain angle with respect to the mean flow When subjected to a stabilizing rotation, the Couette turbulence is locally quenched and exhibits the stripe pattern as similar to non-rotating cases. In this context, the turbulence stripe can he seen as an intrinsic phenomenon in the reverse transition in a channel flow.