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Journal Articles Physics of Fluids Year : 2009

On the unsteady behavior of turbulence models

Abstract

Periodically forced turbulence is used as a test case to evaluate the predictions of two-equation and multiple-scale turbulence models in unsteady flows. The limitations of the two-equation model are shown to originate in the basic assumption of spectral equilibrium. A multiple-scale model based on a picture of stepwise energy cascade overcomes some of these limitations, but the absence of nonlocal interactions proves to lead to poor predictions of the time variation of the dissipation rate. A new multiple-scale model that includes nonlocal interactions is proposed and shown to reproduce the main features of the frequency response correctly.
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Dates and versions

hal-00461450 , version 1 (30-08-2010)

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Cite

Robert Rubinstein, Wouter J.T. Bos. On the unsteady behavior of turbulence models. Physics of Fluids, 2009, 21, pp.041701. ⟨10.1063/1.3121303⟩. ⟨hal-00461450⟩
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