On the unsteady behavior of turbulence models
Fluid Dynamics
2010-09-02 v1 Chaotic Dynamics
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.
Keywords
Cite
@article{arxiv.1009.0127,
title = {On the unsteady behavior of turbulence models},
author = {Robert Rubinstein and Wouter J. T. Bos},
journal= {arXiv preprint arXiv:1009.0127},
year = {2010}
}