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nutRoughWallFunction and Surface Roughness Documented

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Old   July 17, 2018, 03:37
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Jurado
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Hello people,

Is there a reason why you do not use the "nutkAtmRoughWallFunction" that uses directly z0 ?
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Old   July 19, 2018, 02:09
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Michael Alletto
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Can you provide a better description of your test case. Domain, inital and boundary conditions.
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Old   July 19, 2018, 03:29
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Quote:
Originally Posted by mAlletto View Post
Can you provide a better description of your test case. Domain, inital and boundary conditions.

My question was just about the boundary condition on the ground for atmospheric boundary condition. Because I saw a lot of people using the sand grain relationship with ks and cs and that they had to convert their roughness length z0 into ks and cs.


While for I there is no need for that in as much as there is already a boundary condition for nut that take directly z0 parameter.

So I was wondering if something was wrong with it for people not using it or if people just didn't know it existed.
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Old   July 12, 2021, 10:28
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How do you put that value or program for roughness in ansys?
The roughness that is inbuilt in cfd is which kind of roughness?
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