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Near Wall treatments in openfoam with refined mesh |
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October 24, 2009, 10:59 |
Near Wall treatments in openfoam with refined mesh
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#1 |
New Member
Shui Pei
Join Date: Mar 2009
Posts: 27
Rep Power: 17 |
Hi this is Pei, I am using k-epsilon model with default wall functions supported by openfoam, it seems when my mesh is coarse (10/unit lenghth) the result is quit good wcompared to the experiment. But after I increase the mesh desity to (30/unit length), the result changed and not fit the experiment.
I read some reference said the wall functions can only be used when the first point have a distance to the wall. Is there any treatments I can use in refined mesh with k-epsilon model? Another qustion is about edge grading , can I generate a edge like this . . . . ...... . . . . with blockMesh, now I can only use simple grading... Thank you very much. |
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October 26, 2009, 18:27 |
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#2 |
Senior Member
Gavin Tabor
Join Date: Mar 2009
Posts: 181
Rep Power: 17 |
For standard wall models to work you need y+>11.7 for the majority of the first cell to be in the log law region. If you can't manage this you probably need a low Reynolds number model like the Launder/Sharma low-Re k-e model.
On your second question, could you split the edge into two separate blocks?; |. . . . ..|.... . . . . | Gavin |
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October 26, 2009, 21:57 |
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#3 | |
New Member
Shui Pei
Join Date: Mar 2009
Posts: 27
Rep Power: 17 |
Quote:
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June 1, 2015, 06:34 |
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#4 | |
Member
behzad Ghasemi
Join Date: Sep 2013
Location: Iran
Posts: 56
Rep Power: 13 |
Quote:
i have same problem with grading and couldn't solve it. if you could solve this please help me too. i saw your modified blockMesh utility but it doesn't work on my OF versions.i tested on 1.6 ext,2.1.1,2.2.0 and 2.2.1. thanks in advance |
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