A Critical Analysis of Turbulence Dissipation in Near Wall flows, based on Stereo Particle Image Velocimetry and Direct Numerical Simulation data
Résumé
An experiment was performed using Stereo Particle Image Velocimetry (SPIV) in the Laboratoire de Mécanique des Fluides de Lille boundary layer facility to determine all the derivative moments needed to estimate the average dissipation rate of the turbulence kinetic energy = 2ν sijsij where sij is the fluctuating strain-rate and denotes ensemble averages. Also measured were all the moments of the full average deformation rate tensor, as well as all of the first, second and third fluctuating velocity moments except those involving pressure. The Reynolds number was Re θ = 7634 or Reτ = 2598. The present paper gives the measured average dissipation, and the derivative moments comprising it. The results are compared to the earlier measurements of [Balint et al., 1991, Honkan and Andreopoulos, 1997] at lower Reynolds numbers and to new results from a plane channel flow DNS at comparable Reynolds number. Of special interest is the prediction by [George and Castillo, 1997, Wosnik et al., 2000] that + ∝ x +
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