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CATEGORIES:Fluid Mechanics (DAMTP)
SUMMARY:Spanwise rotation effects on wall bounded flows - 
 P. Henrik Alfredsson (KTH\, Stockholm)
DTSTART;TZID=Europe/London:20110204T160000
DTEND;TZID=Europe/London:20110204T170000
UID:TALK28851AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/28851
DESCRIPTION:In shear flows with spanwise system rotation\, i.e
 . when the rotation axis is parallel with the dire
 ction of the mean flow vorticity\, even small rota
 tion rates can lead to drastic changes of the flow
 \, both with respect to the stability of the lamin
 ar flow as well as the structure and behaviour of 
 turbulence. Depending on the direction of rotation
  with respect to the mean vorticity direction the 
 flow is either stabilized or destabilized. The pro
 blem is governed by two parameters\, namely the ro
 tation number and the Reynolds number. In plane Co
 uette flow the mean vorticity direction is the sam
 e across the full channel width\, in contrast to f
 or instance pressure driven plane Poiseuille flow 
 for which the mean vorticity changes sign on the c
 hannel centreline. In this talk we focus on some f
 low visualization experiments of plane Couette flo
 w and describe a number of flow states occurring i
 n the parameter plane spanned by the Reynolds numb
 er and the rotation number. Some comparisons with 
 plane Poiseuille flow and curved channel (Dean) fl
 ow are also made.
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberfor
 ce Road\, Cambridge
CONTACT:Doris Allen
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