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SUMMARY:Spanwise rotation effects on wall bounded flows - P. Henrik Alfred
 sson (KTH\, Stockholm)
DTSTART:20110204T160000Z
DTEND:20110204T170000Z
UID:TALK28851@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:In shear flows with spanwise system rotation\, i.e. when the r
 otation axis is parallel with the direction of the mean flow vorticity\, e
 ven small rotation rates can lead to drastic changes of the flow\, both wi
 th respect to the stability of the laminar flow as well as the structure a
 nd behaviour of turbulence. Depending on the direction of rotation with re
 spect to the mean vorticity direction the flow is either stabilized or des
 tabilized. The problem is governed by two parameters\, namely the rotation
  number and the Reynolds number. In plane Couette flow the mean vorticity 
 direction is the same across the full channel width\, in contrast to for i
 nstance pressure driven plane Poiseuille flow for which the mean vorticity
  changes sign on the channel centreline. In this talk we focus on some flo
 w visualization experiments of plane Couette flow and describe a number of
  flow states occurring in the parameter plane spanned by the Reynolds numb
 er and the rotation number. Some comparisons with plane Poiseuille flow an
 d curved channel (Dean) flow are also made.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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