Abstract
The collapse of homogeneous three-dimensional turbulence submitted to stable stratification is investigated with the help of direct numerical simulations (643 resolution points) and by performing large-eddy simulations (323) with the subgrid scale procedure developed by Chollet and Lesieur for isotropic turbulence.
Comparisons between the direct numerical simulations and the laboratory experiments performed by Itsweire, Heiland and Van Atta show that the numerical techniques have a satisfactory degree of realism. In the computation, the vertical integral scale is frozen by the stratification and some signs of flow two-dimensionalization are exhibited at time of the order of 6N −1 (N Brunt-Väisälä frequency). These results seem to qualitatively reproduce what one observes in the wake of a slender body towed in a stratified channel.
The same signs of “collapse” are exhibited in the large-eddy simulations. Although the subgrid-scale model simulates the dissipation effects of infinitely large Reynolds number turbulence, the collapse time is of the same order as the one given by direct numerical simulations. The model, although isotropic, allows for an anisotropy to grow from large to small scales. Furthermore, the improved large-scale resolution permits a more precise study of the dynamics of these scales with the help of spectral transfer functions.
We then focus on the spatial structure of the stratified flow.
A simple model derived from two-point closure techniques (E.D.Q.N.M.) is presented. This model could be very useful to describe very high Reynolds number stratified flows and to modify the subgrid- scale parameterization.
Institut National Polytechnique et Université Joseph Fourier de Grenoble, Unité associée au CNRS
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Métais, O., Chollet, JP. (1989). Turbulence Submitted to Stable Density Stratification: Large-Eddy Simulations and Statistical Theory. In: André, JC., Cousteix, J., Durst, F., Launder, B.E., Schmidt, F.W., Whitelaw, J.H. (eds) Turbulent Shear Flows 6. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-73948-4_31
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