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Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

MODELLING THE RAPID PRESSURE-STRAIN CORRELATION IN THE RAPID DISTORTION LIMIT

pages 226-231
DOI: 10.1615/TSFP6.360
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RESUMO

The rapid part of pressure-strain correlation is one of the key elements in DRSM that has received significant research attention. However, the existing model proposals still exhibit some apparent deficiencies when subjected to flows with rapid distortion. For instance, the initially isotropic turbulence subjected to rapid distortion, Sjogren & Johansson (2000) showed that all the existing rapid pressure-strain models would deliver the identical path in the anisotropy-invariant map (AIM) for homogeneous plane strain and shear flows. The RDT result shows two distinct curves reflecting different flow physics (POPE, 2000). Lee et al. (1990) shows RDT may give an accurate description of the turbulence at realistic strain rates in a study, using RDT and DNS, of turbulence subjected to a homogeneous shear flow. We believe that a good turbulence model should match RDT for rapid deformations. Present work presents a possible candidate to overcome these deficiencies through the inclusion of the strain and rotation rate tensors S and Ω in the expansion of the fourth rank M-tensor. Numerical results show the test model proposed here is effective in reflecting the rapid distortion effects on turbulence.

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