可压缩湍流大涡模拟中的有利滤波和宏观温度

Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics Pub Date : 2001-05-01 DOI:10.1016/S1620-7742(01)01331-9

Marcel Lesieur , Pierre Comte

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引用次数: 32

摘要

我们展示了在宏观温度下使用的Favre密度加权滤波如何大大简化了可压缩湍流中大涡模拟的形式化。对于0.3马赫的平面通道和矩形空腔上方的跨声速流动，该方法得到了很好的结果。在这两种情况下，由于速度梯度张量第二不变量Q的正等面，Λ-shaped相干涡的脱落都很好地表征了。

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Favre filtering and macro-temperature in large-eddy simulations of compressible turbulence

We show how Favre density-weighted filtering, used with a macro-temperature, simplifies considerably the formalism of large-eddy simulations in compressible turbulence. The method gives good results for a plane channel at Mach 0.3, and a transonic flow above a rectangular cavity. In both cases, the shedding of $Λ$ -shaped coherent vortices is very well characterized thanks to positive iso-surfaces of $Q$ , the velocity-gradient tensor second invariant.

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Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics

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