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首页> 美国政府科技报告 >Turbulence transport equations for variable-density turbulence and their relationship to two-field models.
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Turbulence transport equations for variable-density turbulence and their relationship to two-field models.

机译：变密度湍流的湍流输运方程及其与双场模型的关系。

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摘要

This study gives an updated account of our current ability to describe multimaterial compressible turbulent flows by means of a one-point transport model. Evolution equations are developed for a number of second-order correlations of turbulent data, and approximations of the gradient type are applied to additional correlations to close the system of equations. The principal fields of interest are the one- point Reynolds tensor for variable-density flow, the turbulent energy dissipation rate, and correlations for density-velocity and density- density fluctuations. This single-field description of turbulent flows is compared in some detail to two-field flow equations for nonturbulent, highly dispersed flow with separate variables for each field. This comparison suggests means for improved modeling of some correlations not subjected to evolution equations.

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