Numerical simulations of turbulent shear flows |
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Authors: | M. Lesieur |
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Affiliation: | (1) Institut de Mécanique de Grenoble (L.E.G.I.), B.P. 53 X, 38041 Grenoble-Cedex, France |
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Abstract: | We simulate three-dimensional mixing layers, isotropic turbulence, and rotating turbulence. In the mixing-layer case, we show that high compressibility inhibits helical pairings obtained in the incompressible case, yielding a staggered array of large -shaped vortices. For isotropic turbulence, one shows the existence of large coherent low-pressure vortices, characterized by exponential tails of various p.d.f.'s. We develop also a new subgrid-scale model applied with success to the backward-facing step, and to the compressible boundary layer. Finally, one looks at the influence of solid-body rotation upon free-shear flows or homogeneous turbulence. At moderate Rossby numbers, cyclonic vortices are stabilized, while anticyclonic vortices are disrupted into intense Görtler-type alternate longitudinal vortices. |
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Keywords: | turbulence vortices numerical simulations compressibility rotation |
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