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SUMMARY:The Counter-propagating Rossby Waves' perspective to shear flows
DTSTART:20130926T100000
DTEND:20130926T120000
DTSTAMP:20260415T093323Z
UID:44a06b0c5e33aec2a8a97136d0041503f4d86e412fac67aef406f565
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Eyal Heifetz\, Tel Aviv University\nThe concept of Count
 er-propagating Rossby Waves (CRWs) was been introduced by Bretherton (1966
 ) to explain the basic mechanism of baroclinic instability in the atmosphe
 re. This is the main mechanism which generates cyclones and hence determin
 es the weather in the mid-latitudes. CRWs are vorticity waves which propag
 ate in regions of strong vorticity gradients in a counter-direction to the
  mean flow (the mid-latitudinal atmospheric jet ).  They interact in a di
 stance by inducing a far velocity field which enables them to be phase-loc
 ked in a growing configuration.\nIn this talk I will try to relate this ap
 proach to general shear flow instability and to show how it rationalizes d
 ifferent fundamental aspects of the instability including the necessary co
 nditions for the onset of the instability\, and the mechanism of optimal n
 on-normal growth and how it feeds back with nonlinear mixing.\nFinally\, I
  will suggest a more general type of modified Rossby-gravity wave instabil
 ity in the presence of stratification\, where the dynamics is formulated s
 olely in terms of vorticity and wave displacement across the shear. I will
  argue that the latter formulation can be generally applied to various dif
 ferent setups where external forces generate vorticity by exerting torque 
 on the flow.
LOCATION:Room Nano BM 6204 http://plan.epfl.ch/?room=BM%206204
STATUS:CONFIRMED
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