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SUMMARY:Clustering of inertial particles in shear flows - Casciola\, CM (S
 apienza Universit di Roma)
DTSTART:20081002T153000Z
DTEND:20081002T160000Z
UID:TALK13871@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Recently\, clustering of inertial particles in turbulence has 
 been thoroughly analyzed for statistically homogeneous and isotropic flows
 . The most striking result concerns the singular behavior exhibited by the
  radial distribution function under proper resonance conditions\, showing 
 clustering below the Kolmogorov scale. Since anisotropy is strongly deplet
 ed through the inertial range\, the advecting field anisotropy may be expe
 cted in-influential for the small scale features of particle configuration
 s. By addressing direct numerical simulations (DNS) of a statistically ste
 ady particle-laden homogeneous shear flow\, we find instead that the small
  scales of the particle distribution are strongly affected by the geometry
  of velocity fluctuations at large scales. The proper statistical tool is 
 the angular distribution function of particle pairs (ADF). Its anisotropic
  component may develop a singularity whose strength quantifies the anisotr
 opy of the small scale clustering. The data provide evidence that the proc
 ess is essentially anisotropic\, even in the range of scales where isotrop
 ization of velocity statistics already occurred. Possible implications and
  connections of the above findings for turbophoresis in wall bounded shear
  flows will be briefly outlined using DNS data of particle laden turbulent
  pipe flows as example.
LOCATION:Seminar Room 1\, Newton Institute
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