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SUMMARY:The Reynolds shear stress in zero pressure gradient turbulent boun
 dary layers - Monkewitz\, P (EPFL)
DTSTART:20080909T151000Z
DTEND:20080909T153000Z
UID:TALK13351@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The Reynolds shear stress (RS) in zero pressure gradient turbu
 lent boundary layers is established using recently developed composite mea
 n velocity profiles based on the log-law in the overlap region between inn
 er and outer profiles. The contribution of the normal stress difference is
  also considered and shown to be relatively small. From this analysis\, an
  asymptotic expansion for the maximum RS and its location is developed. Th
 e hypotheses underlying this analysis are discussed and the results are co
 mpared with experiments and DNS. Using the friction velocity as scale\, th
 e RS determined from composite mean velocity profiles agrees reasonably we
 ll with low-Re experimental results. However\, when comparing with high-Re
  experiments and DNS\, the agreement is generally limited as near the wall
  the experimental accuracy and resolution becomes problematic and far from
  the wall the numerical treatment of the boundary condition is very delica
 te. 
LOCATION:Seminar Room 1\, Newton Institute
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