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SUMMARY:Significance of localized vortical disturbances in wall-bounded an
 d free shear flows - Cohen\, J (Technion)
DTSTART:20080910T094000Z
DTEND:20080910T100000Z
UID:TALK13355@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The resemblance among coherent structures naturally occurring 
 in fully developed bounded turbulent shear flows\, transitional flows and 
 free shear layers suggests the existence of a basic mechanism responsible 
 for the formation of the structures under various base flow conditions. Th
 e common elements in all such flows are the shear of the base flow and the
  presence of a localized vortical disturbance within this shear. Due to th
 eir localization in space\, the surrounding base flow can be assumed to ha
 ve homogeneous shear to leading order. In this talk we combine analytical\
 , numerical and experimental tools to show that indeed the interaction bet
 ween a localized dipole-vortical disturbance and the surrounding `simple' 
 laminar shear flow where the velocity vector is (at most) a linear functio
 n of the coordinates\, can reproduce the generation mechanism and characte
 ristics of the coherent structures that naturally occur in turbulent bound
 ed shear flows (counter-rotating vortex pairs and hairpin vortices) and fr
 ee shear layers (`rib vortices'). 
LOCATION:Seminar Room 1\, Newton Institute
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