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How the trace term of SGS stress tensor implemented in Openfoam

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Old   March 3, 2012, 09:56
Default How the trace term of SGS stress tensor implemented in Openfoam
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How does the trace term of SGS stress tensor, 2/3kI, implement in OpenFoam. I can't find the code in solvers, such as pisoFoam. And in the Forum, I remenber that someone said OF add the term of 2/3kI in the pressure gradient. But where can I find it in the code?
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