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November 8, 2024, 11:26 |
OpenFOAM's y+ <=5 Boundary Conditions
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#1 |
New Member
Christoforos Lefkiou
Join Date: Oct 2024
Posts: 23
Rep Power: 2 |
Hello everybody,
I am working in a relatively simple task (calculation of drag coefficient of 2D cylinder) and I am using a mesh that has a y+ < 5. Therefore, I won’t use Wall Functions (at least log-law wall functions). I have been searching through the forum (and outside of it) to find what are the B.C for this case, for low values of y+, but I couldn’t find a clear answer. I am working with k-omega SST turbulence model. Can someone please explain what B.C I must use for my cylinder wall in k, omega and nut? Thank you, |
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November 12, 2024, 08:40 |
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#2 |
New Member
talop
Join Date: Feb 2023
Posts: 8
Rep Power: 3 |
Hi clef1,
The "lowReWallFunction" did the trick for me. https://www.openfoam.com/documentati...lFunction.html Similar BCs exist for others as well. Try the banana trick to see the list of available BCs and run a google search for interesting ones. You can also try 3D unsteady RANS and DES. They tend to give better results for this problem. Best |
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November 12, 2024, 11:19 |
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#3 | |
New Member
Christoforos Lefkiou
Join Date: Oct 2024
Posts: 23
Rep Power: 2 |
Quote:
Thank you for your reply, It seems that some k and nut (and omega) wall functions are adjusted depending on y+, therefore we can use them throught the range of y+. I will check your comments, Thanks |
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