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About the nut and nusgs

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Old   April 10, 2018, 00:21
Wink About the nut and nusgs
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I have a question about the nut and nusgs files in the /0 .
In the Openfoam 2.3.0 ,there is still nusgs file in the 0/.But in the Openfoam 4.0.0,the nusgs file is replaced by nut file.
As I think,the physical meaning of both file is different.
why nusgs file can be replaced by nut file?Does that mean the boundary condition of both file is same?
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Old   April 10, 2018, 15:43
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The way that subgrid scale (SGS) viscosity is treated/named has changed for the newer OF releases. Old versions (eg 2.x) used nuSgs (see eg The newer versions simply refer to the SGS viscosity as nut. Previous OF releases distinguished between nuSgs/muSgs for incompressible/compressible solvers. This is done behind the scenes in newer OF releases. Check out the tutorials for various ways to set boundary conditions for nut.

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nut nusgs

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