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(1)

Turbulent-laminar banded patterns in plane Poiseuille flow

Laurette Tuckerman PMMH-ESPCI-CNRS

Re � 900 Re � 1600

What about for intermediate Reynolds numbers?

?

Monday, March 25, 2013

(2)

Time-averaged turbulent-laminar pattern

spanwise velocity

in cross-channel planes streamwise vorticity

on top plate streamwise

direction

x

z

x y z

y

Monday, March 25, 2013

(3)

Instantaneous streamwise vorticity

normal to streamwise direction

on upper plate

z x

y

streamwise

z

Monday, March 25, 2013

(4)

Velocity of bands:

close to u

mean

and Re-dependent

3

2(umean uwall)

units of

×103

time

Monday, March 25, 2013

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