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SUMMARY:Local flow structure and Reynolds number dependence of Lagrangian 
 statistics in direct numerical simulations of homogeneous turbulence - Yeu
 ng\, PK (Georgia Institute of Technology)
DTSTART:20081002T110000Z
DTEND:20081002T113000Z
UID:TALK13867@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Reynolds number dependence including the effects of intermitte
 ncy is a crucial issue in the study of Lagrangian statistics and in how in
 formation from direct numerical simulations can be useful for stochastic m
 odeling. Intermittency in the form of localized regions of intense straini
 ng or rotation is\, for example\, expected to influence how rapidly a flui
 d particle undergoes acceleration\, and how multiple diffusing fluid parti
 cles move apart from each other. An effective approach to delineate such e
 ffects is to compute Lagrangian statistics conditioned on energy dissipati
 on rate\, enstrophy\, or pseudo-dissipation following fluid particle traje
 ctories. In this talk we shall illustrate these issues via recent results 
 from simulations of isotropic turbulence at Reynolds numbers sufficiently 
 high for observing inertial range behavior in the Eulerian (but not necess
 arily Lagrangian) frame. We also discuss research directions in the near f
 uture\, including flows of greater complexity\, and the promise of simulat
 ions at ever-increasing grid resolution that rapid advances in computing p
 ower are expected to make feasible.
LOCATION:Seminar Room 1\, Newton Institute
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