Localized edge states nucleate turbulence in extended plane {Couette} cells

We study the turbulence transition of plane Couette flow in large domains where localized perturbations are observed to generate growing turbulent spots. Extending previous studies on the boundary between laminar and turbulent dynamics we determine invariant structures intermediate between laminar and turbulent flow. In wide but short domains we find states that are localized in spanwise direction, and in wide and long domains the states are also localized in downstream direction. These localized states act as critical nuclei for the transition to turbulence in spatially extended domains. Copyright © Cambridge University Press 2010.


Published in:
J. Fluid Mech., 646, 441
Year:
2010
ISSN:
0022-1120
ISBN:
0022112009993
Laboratories:




 Record created 2015-12-07, last modified 2018-03-17

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