nutRoughWallFunction and Surface Roughness Documented

Jurado · July 17, 2018, 03:37

Hello people,

Is there a reason why you do not use the "nutkAtmRoughWallFunction" that uses directly z0 ?

mAlletto · July 19, 2018, 02:09

Can you provide a better description of your test case. Domain, inital and boundary conditions.

Jurado · July 19, 2018, 03:29

Quote:

Originally Posted by mAlletto

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.

Shuveksha · July 12, 2021, 10:28

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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July 17, 2018, 03:37		#61
Jurado New Member Jurado Join Date: Nov 2017 Posts: 22 Rep Power: 7	Hello people, Is there a reason why you do not use the "nutkAtmRoughWallFunction" that uses directly z0 ?

July 19, 2018, 02:09		#62
mAlletto Senior Member Michael Alletto Join Date: Jun 2018 Location: Bremen Posts: 609 Rep Power: 14	Can you provide a better description of your test case. Domain, inital and boundary conditions.

July 12, 2021, 10:28		#64
Shuveksha New Member SUVECKSHYA Join Date: May 2021 Posts: 5 Rep Power: 3	How do you put that value or program for roughness in ansys? The roughness that is inbuilt in cfd is which kind of roughness?