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April 9, 2018, 23:21 |
About the nut and nusgs
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#1 |
New Member
Join Date: Aug 2017
Posts: 9
Rep Power: 9 |
Hi
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. Q: why nusgs file can be replaced by nut file?Does that mean the boundary condition of both file is same? |
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April 10, 2018, 14:43 |
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#2 |
Senior Member
Join Date: Aug 2015
Posts: 494
Rep Power: 15 |
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 https://github.com/OpenFOAM/OpenFOAM...es/pitzDaily/0). 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.
Caelan |
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Tags |
nut nusgs |
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