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SUMMARY:Shallow flows: 2D or not 2D? - GertJan van Heijst (Eindhoven Unive
 rsity of Technology)
DTSTART:20131118T130000Z
DTEND:20131118T140000Z
UID:TALK47890@talks.cam.ac.uk
CONTACT:Doris Allen
DESCRIPTION:It is commonly assumed that shallow flows are in good approxim
 ation two-dimensional (2D) or quasi-two-dimensional. We will provide evide
 nce that this is not always the case\, and that the simple scaling argumen
 t based on the continuity equation does not always apply.  Laboratory expe
 riments on vortex flows in shallow fluid layers have revealed that locally
  significant three-dimensional effects and substantial vertical motions ma
 y occur\, clearly destroying the assumed 2D character of the flow. These l
 aboratory observations are confirmed by three-dimensional numerical flow s
 imulations. Attention will be given to a correct scaling analysis\, in whi
 ch both the aspect ratio of the fluid depth and a typical horizontal scale
  and the Reynolds number play a role.\n
LOCATION:MR5\, Centre for Mathematical Sciences
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