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SUMMARY:Instabilities in variable-property flows\, and the continuous spec
 trum - Govindarajan\, R (JNCASR)
DTSTART:20080910T111000Z
DTEND:20080910T113000Z
UID:TALK13358@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The stability work to be presented here is motivated by our on
 going numerical study of vortex merger in the presence of density-stratifi
 cation. We find that very strong density stratification (even ``stable'' s
 tratification) can (a) prevent the merger and (b) cause the vortices to br
 eak up. At low diffusivity levels the latter results from an inviscid inst
 ability due to alternately-signed density jumps packed in a known pattern.
  The analytical solution yields several co-existing unstable modes\, and t
 ransient growth can add significantly to the linear growth at moderate tim
 es\, thus speeding up the break-up of a single vortex. A related problem o
 f Couette-Poiseuille flow and its continuous spectrum in the presence of l
 ow levels of base-flow vorticity will be discussed.
LOCATION:Seminar Room 1\, Newton Institute
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