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DTSTAMP:20250803T215745Z
DESCRIPTION:Atmospheric and Oceanic Sciences Departmental Seminar Series\n
 \npresents\n\n \n\nInstabilities in rotating shear flows: role in driving 
 large scale vortices \n\na talk by\n	Sutirtha Sengupta\n	PhD candidate\n	Appl
 ied Mathematics\, UC Santa Cruz\n\n \n\nWe study the effects of global rot
 ation on the growth and saturation of the fingering (double- diffusive) in
 stability and estimate the compositional transport rates as a function of 
 the relevant non-dimensional parameters (Rossby number and density ratio) 
 at low Prandtl numbers through direct numerical simulations (DNSs). Rather
  surprisingly\, within our explored range of parameters\, we find rotation
  to have very little eff on vertical transport apart for an exceptional ca
 se where a cyclonic large scale vortex (LSV) is observed at low density ra
 tio and fairly high Taylor number. The LSV leads to significant enhancemen
 t in the fingering transport rates by concentrating high composition fluid
  at its core which moves downward. The formation of such LSVs is of partic
 ular interest for solving the missing mixing problem in the astrophysical 
 context of RGB stars though the parameter regime in which we observe the e
 mergence of this LSV seems to be quite far from the astrophysical expectat
 ion. Nevertheless\, we attempt to explain the origin of such vortical flow
 s from two separate points of view within the framework of the classical i
 nverse cascade ideas as well from linear theory of an idealized columnar s
 hear flow through a rectangular domain in a rotating frame as well as idea
 lized DNSs to predict the eff of increasing rotation on various modes of i
 nstabilities\, and discuss their role in imparting angular momentum to the
  shear flow.\n\n \n\nThursday Aug 08/ 2:30 PM/ Burnside Hall/ Room 934\n
DTSTART:20190808T183000Z
DTEND:20190808T200000Z
LOCATION:Room 934
SUMMARY:Instabilities in rotating shear flows: role in driving large scale 
 vortices
URL:/meteo/channels/event/instabilities-rotating-shear
 -flows-role-driving-large-scale-vortices-299169
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