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SUMMARY:Mixing and vorticity staircases in 2-d fluid flows - Andrew Gilber
 t (University of Exeter)
DTSTART:20100215T160000Z
DTEND:20100215T170000Z
UID:TALK22037@talks.cam.ac.uk
CONTACT:Laurène Jouve
DESCRIPTION:Vortices are important structures in many fluid flows\, for ex
 ample hurricanes\nand cyclones in the atmosphere\, or gulf stream rings in
  the ocean. We have been\nstudying some of the idealised behaviour of high
  Reynolds number vortices in\ntwo dimensions. These involve coupling betwe
 en transport of vorticity as a\nscalar (in two dimensions) but one which a
 lso determines the flow field. These\nstudies\, which link the stability p
 roperties of vortices to their mixing\nproperties throw light on questions
  of why vortices are so robust\, how they can\nsupport structures such as 
 tripoles and cat's eyes\, and the emergence of `surf\nzones' of enhanced m
 ixing and vorticity `staircases'. We will outline some of\nour research in
  this area (with Matthew Turner\, Brighton\, Andrew Bassom\,\nPerth).
LOCATION:MR14\, DAMTP\, Pav. F
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