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SUMMARY:Coherent Lagrangian Vortices in Turbulence - George Haller (ETH Z
 ürich)
DTSTART:20170816T140000Z
DTEND:20170816T145000Z
UID:TALK76662@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:Coherent vortices are the most important building blocks of co
 mplex flows\, yet no universally accepted vortex definition has emerged in
  fluid dynamics yet. A reason is that most vortex definitions depend cruci
 ally on the frame of the observer who evaluates them\, even though the sig
 nificance of vortices arises from the frame-invariant material transport t
 hey induce. Recently\, ideas from nonlinear dynamics and continuum mechani
 cs have lead to new\, objective notions of coherence in fluid dynamics. Th
 ese reveal surprisingly coherent\, previously undetected Lagrangian (i.e.\
 , material) vortices in turbulent flows.  We survey these ideas and illust
 rate their efficacy on geophysical flow data.  <br><br><br><br>
LOCATION:Seminar Room 2\, Newton Institute
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