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nutRoughWallFunction and Surface Roughness Documented |
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July 17, 2018, 04:37 |
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#61 |
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Jurado
Join Date: Nov 2017
Posts: 22
Rep Power: 9 |
Hello people,
Is there a reason why you do not use the "nutkAtmRoughWallFunction" that uses directly z0 ? |
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July 19, 2018, 03:09 |
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#62 |
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Michael Alletto
Join Date: Jun 2018
Location: Bremen
Posts: 616
Rep Power: 16 |
Can you provide a better description of your test case. Domain, inital and boundary conditions.
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July 19, 2018, 04:29 |
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#63 | |
New Member
Jurado
Join Date: Nov 2017
Posts: 22
Rep Power: 9 |
Quote:
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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July 12, 2021, 11:28 |
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#64 |
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SUVECKSHYA
Join Date: May 2021
Posts: 5
Rep Power: 5 |
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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January 6, 2024, 08:13 |
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#65 | |
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Marķa Rosales
Join Date: Mar 2023
Location: Spain
Posts: 48
Rep Power: 3 |
Quote:
Hi Jurado, I know its been years since your post. I'm somehow new to this ABL set-up, and I will rely on using atmNutWallFunc + omega/Epsilon atmEallFunc since they consider z0. I've seen too some foamers that uses standard wall BC's but there is a need (a must) to set z0 because this will help up to displace our wall level so we can mesh with y+ >> 30 & >> 300. I do have an issue that pressure gradient running steady simpleFoam gaves me negative pressure at the inlet and 0 at outlet, using atmInlet BC's, but I think is because setting outlet to 0 and providing inlet velocity Could you share the assumpation that you came to at that time? |
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