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SUMMARY:On the nature of intermittency in a turbulent von Kármán flow 
 - Hugues Faller\, Universite Paris-Saclay\, France
DTSTART:20210604T153000Z
DTEND:20210604T163000Z
UID:TALK160762@talks.cam.ac.uk
CONTACT:James Parke
DESCRIPTION:We have conducted an extensive study of the scaling properties
  of small scale turbulence using both numerical and experimental data of a
  flow in the same von Kármán geometry. We have computed the wavelet st
 ructure functions\, and the structure functions of the vortical part of th
 e flow and of the local energy transfers. We find that the latter obeys a 
 generalized extended scaling\, similar to that already observed for the wa
 velet structure functions. We compute the multi-fractal spectra of all the
  structure functions and show that they all coincide with each other\, pro
 viding a local refined hypothesis. We find that both areas of strong vorti
 city and strong local energy transfer are highly intermittent and are corr
 elated. For most cases\, the location of local maximum of energy transfer 
 is shifted with respect to the location of local maximum of vorticity. We 
 however observe a much stronger correlation between vorticity and local en
 ergy transfer in the shear layer\, that may be an indication of a self-sim
 ilar quasi-singular structure that may dominate the scaling properties at 
 large order structure functions.
LOCATION:GKB 100 Fluid Mechanics Webinar Series
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