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Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

A "FREE" HIGH-REYNOLDS-NUMBER TURBULENCE: CONSISTENCY OF MEASUREMENTS WITH THE KOLMOGOROV-OBOUKHOV PREDICTIONS AND LES/SSAM APPROACH

pages 1-6
DOI: 10.1615/TSFP7.1150
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SINOPSIS

This work is motivated by recent experimental observations of intermittent dynamics of Lagrangian acceleration in a high-Reynolds-number "free" turbulence. First, we have shown that those observations are consistent with the Kolmogorov-Oboukhov theory. Second, in lines with Kolmogorov-Oboukhov's predictions, we proposed a new sub-grid scale (SGS) model of residual acceleration, which was introduced in the framework of an approach here referred to as LES-SSAM (Subgrid Stochastic Acceleration Model). The coarse-grid computation of a high-Reynolds-number stationary homogeneous turbulence provided: (i) non- Gaussianity in the acceleration distribution with stretched tails; (ii) rapid decorrelation of acceleration vector components; (iii) "long memory" in correlation of its norm.

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