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- W13303626 abstract "Traditional turbulence models invoke a range of equilibrium assumptions that renders them incapable of describing turbulent flows where the departures from equilibrium are large. Even the commonly used second-order closures have an implicit equilibrium assumption for the pivotal pressure-strain correlation that makes them incapable of describing such non-equilibrium turbulent flows. It will be shown that explicit algebraic stress models can be partially extended to non-equilibrium turbulent flows by a Pade approximation. Then, by implementing a relaxation time approximation, second-order closures are obtained where — to the lowest order — the rapid pressure-strain correlation is represented by models that depend nonlinearly on the invariants of the non-dimensional strain rates. However, unlike in many of the more recent second-order closures, linearity is maintained in the Reynolds stress anisotropy tensor consistent with the definition of the rapid pressure-strain correlation. It will be demonstrated by a variety of examples how this leads to an improved performance in non-equilibrium turbulence without compromising the predictions for the near-equilibrium case. A new approach to large-eddy simulations will also be presented that allows subgrid scale stress models to continuously go to Reynolds stress models in the coarse mesh/infinite Reynolds number limit. Furthermore, the modeling of the turbulent dissipation rate will be considered, particularly in regard to the non-equilibrium effects of vortex stretching and anisotropic dissipation. The status of these recent developments and the prospects for future research will be thoroughly discussed." @default.
- W13303626 created "2016-06-24" @default.
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- W13303626 date "1999-01-01" @default.
- W13303626 modified "2023-09-27" @default.
- W13303626 title "Modeling Non-Equilibrium Turbulent Flows" @default.
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- W13303626 doi "https://doi.org/10.1007/978-94-011-4724-8_8" @default.
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