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CATEGORIES:Engineering Fluids Group Seminar
SUMMARY:Unsteady Turbulence Cascades - Professor C. Vassil
 icos\, Imperial College\, London
DTSTART;TZID=Europe/London:20170120T130000
DTEND;TZID=Europe/London:20170120T140000
UID:TALK70377AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/70377
DESCRIPTION:Turbulence energy transfer through scales is argua
 bly one of the most\ncentral and important process
 es in turbulent flows. Much of turbulence\ntheory 
 and modelling over the past 70 years has been base
 d on the\nKolmogorov (1941) stationary cascade whi
 ch implies a particular\nwell-known scaling of the
  turbulence dissipation rate.  However\,\naccumula
 ting evidence from laboratory experiments and\, mo
 re recently\,\nnumerical simulations is pointing a
 t a very different turbulence\ndissipation scaling
  in important regions of various turbulent\nflows.
  There are consequences for boundary-free turbulen
 t shear flows\nsuch as self-similar turbulent wake
 s and jets because their growth\nrates are closely
  linked to the centreline turbulence dissipation\n
 scaling. These consequences include new turbulent 
 mean flow scalings\nwith streamwise distance\, and
  consequences concerning entrainement\nthrough the
  turbulent/non-turbulent interface. Direct Numeric
 al\nSimulations of unsteady periodic turbulence su
 ggest that the\nturbulence dissipation scalings ar
 e related to unsteady interscale\nenergy transfer 
 processes. Different dissipation scalings result f
 rom\ndifferent types of unsteady interscale energy
  transfers.
LOCATION:JDB Seminar Room\, CUED
CONTACT:Akshath Sharma
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