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SUMMARY:Unsteady Turbulence Cascades - Professor C. Vassilicos\, Imperial 
 College\, London
DTSTART:20170120T130000Z
DTEND:20170120T140000Z
UID:TALK70377@talks.cam.ac.uk
CONTACT:Akshath Sharma
DESCRIPTION:Turbulence energy transfer through scales is arguably one of t
 he most\ncentral and important processes in turbulent flows. Much of turbu
 lence\ntheory and modelling over the past 70 years has been based on the\n
 Kolmogorov (1941) stationary cascade which implies a particular\nwell-know
 n scaling of the turbulence dissipation rate.  However\,\naccumulating evi
 dence from laboratory experiments and\, more recently\,\nnumerical simulat
 ions is pointing at a very different turbulence\ndissipation scaling in im
 portant regions of various turbulent\nflows. There are consequences for bo
 undary-free turbulent shear flows\nsuch as self-similar turbulent wakes an
 d jets because their growth\nrates are closely linked to the centreline tu
 rbulence dissipation\nscaling. These consequences include new turbulent me
 an flow scalings\nwith streamwise distance\, and consequences concerning e
 ntrainement\nthrough the turbulent/non-turbulent interface. Direct Numeric
 al\nSimulations of unsteady periodic turbulence suggest that the\nturbulen
 ce dissipation scalings are related to unsteady interscale\nenergy transfe
 r processes. Different dissipation scalings result from\ndifferent types o
 f unsteady interscale energy transfers.
LOCATION:JDB Seminar Room\, CUED
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