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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Coherent Lagrangian Vortices in Turbulence - Georg
 e Haller (ETH Zürich)
DTSTART;TZID=Europe/London:20170816T150000
DTEND;TZID=Europe/London:20170816T155000
UID:TALK76662AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/76662
DESCRIPTION:Coherent vortices are the most important building 
 blocks of complex flows\, yet no universally accep
 ted vortex definition has emerged in fluid dynamic
 s yet. A reason is that most vortex definitions de
 pend crucially on the frame of the observer who ev
 aluates them\, even though the significance of vor
 tices arises from the frame-invariant material tra
 nsport they induce. Recently\, ideas from nonlinea
 r dynamics and continuum mechanics have lead to ne
 w\, objective notions of coherence in fluid dynami
 cs. These reveal surprisingly coherent\, previousl
 y undetected Lagrangian (i.e.\, material) vortices
  in turbulent flows.  We survey these ideas and il
 lustrate their efficacy on geophysical flow data. 
  <br><br><br><br>
LOCATION:Seminar Room 2\, Newton Institute
CONTACT:INI IT
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