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SUMMARY:The large-scale structure of small-scale turbulence\, some implica
 tions for dispersion - Dr Gerrit Elsinga (TU Delft)
DTSTART:20190510T120000Z
DTEND:20190510T130000Z
UID:TALK123307@talks.cam.ac.uk
CONTACT:Joseph Ibrahim
DESCRIPTION:Turbulence is omnipresent in flows of engineering and environm
 ental interest\, and is well known to contribute significantly to\, for ex
 ample\, scalar dispersion and skin friction. When modelling the effects of
  turbulence\, it is typically assumed that the small-scale motions are lar
 gely independent of the large scales of turbulent motion. However\, there 
 is increasing evidence to suggest that this simplification is invalid and 
 the source of major inaccuracy in existing models and scaling laws.\n \nTh
 e talk discusses recent advances in the understanding of the spatial struc
 ture of the small-scale motions in turbulence. Most importantly\, their or
 ganisation into shear layers introduces a dependence on the large\, energe
 tic motions bounding the layers\, which are furthermore flow dependent. Th
 ese insights allow to clearly identify shortcomings in certain turbulence 
 models and propose direction for improvements. Moreover\, these findings c
 all into question basic scaling laws for turbulent dispersion.
LOCATION:JDB Seminar Room\, CUED
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