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
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
Instantaneous streamwise vorticity
normal to streamwise direction
on upper plate
z x
y
streamwise
z
Monday, March 25, 2013
Velocity of bands:
close to u
meanand Re-dependent
3
2(umean − uwall)
units of
×103
time
Monday, March 25, 2013