Lagrangian acceleration statistics in turbulent flows

Details Lagrangian acceleration statistics in turbulent flows Lagrangian acceleration statistics in turbulent flows

2002-12-23

arxiv.org/abs/cond-mat/0212566v1

Physics

Condensed Matter

Statistical Mechanics

10 pages, 2 figures

Scientific paper

10.1209/epl/i2003-00498-4

We show that the probability densities af accelerations of Lagrangian test particles in turbulent flows as measured by Bodenschatz et al. [Nature 409, 1017 (2001)] are in excellent agreement with the predictions of a stochastic model introduced in [C. Beck, PRL 87, 180601 (2001)] if the fluctuating friction parameter is assumed to be log-normally distributed. In a generalized statistical mechanics setting, this corresponds to a superstatistics of log-normal type. We analytically evaluate all hyperflatnes factors for this model and obtain a flatness prediction in good agreement with the experimental data. There is also good agreement with DNS data of Gotoh et al. We relate the model to a generalized Sawford model with fluctuating parameters, and discuss a possible universality of the small-scale statistics.

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