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SUMMARY:Turbulent-laminar patterns in plane Couette flow - Tuckerman\, L (
 PMMH-ESPCI)
DTSTART:20080910T130000Z
DTEND:20080910T132000Z
UID:TALK13360@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Plane Couette flow near transition displays steady periodic ob
 lique bands of alternating turbulent and laminar flow. Numerical simulatio
 ns of the Navier-Stokes equations in a tilted domain show a rich variety o
 f such patterns\, including spatio-temporal intermittency\, branching and 
 travelling states\, and localized states analogous to spots. Quantitative 
 analysis of the Reynolds-averaged equations reveals that both the mean flo
 w and the turbulent force are centrosymmetric and can be described by only
  three trigonometric functions\, leading to a model of 6 ODEs. The transit
 ion is best described as a bifurcation in the probability distribution fun
 ction of the first Fourier component. 
LOCATION:Seminar Room 1\, Newton Institute
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