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SUMMARY:Radiative instability of stratified shear flows - Stephan Le Dizes
  (IRPHE\, Marseille)
DTSTART:20101112T160000Z
DTEND:20101112T170000Z
UID:TALK27008@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:In this talk\, I analyse how the stability of a shear flow is 
 modified when placed in a stably stratified fluid. I first show that strat
 ification is stabilizing only if the directions of shear and stratificatio
 n are aligned. When shear and stratification are not aligned\, I demonstra
 te that an additional inviscid instability associated with the emission of
  internal gravity waves can take place. This radiative instability is anal
 ysed in details for models of boundary layer flows\, plane jets and rotati
 ng flows. Both the mechanism of instability and explicit formulas for the 
 characteristics of the instability are provided. Experimental results are 
 also obtained for two types of rotating flows (a Gaussian vortex and the f
 low around a rotating cylinder when the rotation axis is aligned along wit
 h the direction of stratification). Finally\, the results are discussed in
  the context of atmospheric flows and of astrophysical flows (accretion di
 sks).
LOCATION:MR2\, Centre for Mathematical Sciences\, Wilberforce Road\, Cambr
 idge
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