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Effect of Wall Roughness in Low-Turbulence simulations?

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Old   December 17, 2015, 08:42
Default Effect of Wall Roughness in Low-Turbulence simulations?
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gabi
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Hi there,

I have been reading how to simulate a Low-Reynolds flow, and I still do not understand how to take into account wall roughness into the simulations.

We can avoid using wall-functions (if the mesh is properly created and the y+ values are correct.) or we can use specific Low-Reynolds wall-functions, but there is not any specific value to take into account wall roughness in both cases (for example, I would get the same results for glass or wood at the bottom).

For High-Reynolds is clear I think, as there is a wall-function where equivalent sand-roughness appears.

Thanks for your time,
Any help will be appreciated.

g.
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