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VERSION:2.0
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20200107T174041Z
DTSTART:20200318T140000Z
DTEND:20200318T145000Z
SUMMARY:Dan Lucas - Layer formation and transition to turbulence in horiz
 ontally shearing stably stratified flows
UID:{http://www.columbasystems.com/customers/uom/gpp/eventid/}r5r-k545r4o
 p-olgtki
DESCRIPTION:Dan Lucas (Keele) joins us for this seminar in the Physical A
 pplied Mathematics Series.\n\nTitle: Layer formation and transition to t
 urbulence in horizontally shearing stably stratified flows\n\nAbstract: 
 Layers in stratified flows are regions of relatively well-mixed fluid se
 parated by sharp gradients of temperature or density.  They are commonly
  observed to arise spontaneously and are important in regulating the tra
 nsport of heat\, mass and nutrients in the ocean. Unfortunately there ar
 e limited theoretical descriptions of their origins and maintenance. In 
 this talk we survey several new results for turbulent flows driven by a 
 shear which is perpendicular to a stable stratification. First we show h
 ow in a body forced system layer formation can be associated to a strati
 fied linear instability via nonlinear unstable steady solutions. Next we
  explore the differences when we instead drive the flow by moving bounda
 ries in a plane Couette configuration. Here we find layers confined near
  the walls which are seemingly disconnected from any linear mechanism. H
 owever the layer scale provides insight into the way turbulence is shut-
 off when stratification becomes very large.
STATUS:TENTATIVE
TRANSP:TRANSPARENT
CLASS:PUBLIC
LOCATION:Frank Adams 1\, Alan Turing Building\, Manchester
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