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[Other] how to set the boundary layer in openfoam? |
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May 15, 2014, 05:30 |
how to set the boundary layer in openfoam?
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#1 |
New Member
Wen Yuan
Join Date: Apr 2014
Posts: 10
Rep Power: 11 |
Hi,
I'm simulating the flow around cylinder,and I need to set a fixed length to the cylinder patch so that it can be suitable for y+. But I don't know how to do it in openfoam, could anybody can help me?? Best Regards' WenY |
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May 16, 2014, 05:34 |
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#2 |
Super Moderator
Tobias Holzmann
Join Date: Oct 2010
Location: Tussenhausen
Posts: 2,708
Blog Entries: 6
Rep Power: 51 |
Dear Weny,
there are several options to get your boundary layer.
Hope it is helpful.
__________________
Keep foaming, Tobias Holzmann |
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May 18, 2014, 22:36 |
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#3 |
New Member
Wen Yuan
Join Date: Apr 2014
Posts: 10
Rep Power: 11 |
[QUOTE=Tobi;492290]Dear Weny,
there are several options to get your boundary layer.
Dear Tobi, Thanks for your help. I use the blockMesh for my cylinder, But playing around with ratio settings can not get a fixed distance to the cylinder , I wanna have a fixed y+, so what can I do? Best Regards, WenY |
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May 18, 2014, 22:37 |
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#4 | |
New Member
Wen Yuan
Join Date: Apr 2014
Posts: 10
Rep Power: 11 |
Quote:
Thanks for your help. I use the blockMesh for my cylinder, But playing around with ratio settings can not get a fixed distance to the cylinder , I wanna have a fixed y+, so what can I do? Best Regards, WenY |
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May 19, 2014, 09:51 |
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#5 | |
Super Moderator
Tobias Holzmann
Join Date: Oct 2010
Location: Tussenhausen
Posts: 2,708
Blog Entries: 6
Rep Power: 51 |
Quote:
y+ is estimated on the first cell heigth and depend also on velocity. If you have different velocitys you will get other y+ values. Can you explain your problem with a picture? That would be very recommended and other people can help you in a more specific way.
__________________
Keep foaming, Tobias Holzmann |
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May 19, 2014, 22:11 |
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#6 |
New Member
Wen Yuan
Join Date: Apr 2014
Posts: 10
Rep Power: 11 |
here is my model
I used different ways to mesh my model, but get different results of the dragcoeff. I want to know whether the results is related to the mesh condition, or something else? |
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May 19, 2014, 22:30 |
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#7 | |
New Member
Wen Yuan
Join Date: Apr 2014
Posts: 10
Rep Power: 11 |
Quote:
I'm sorry the picture may fail to upload, I just try it again. There is another problem in my simulation: when I used blockMesh to mesh the model, the result was reasonable, But when I used gambit to mesh, the result was wrong. I guess it might be the cause of a wrong boundary or intial conditions.https://www.dropbox.com/s/4yx55pnwi8...t-cylinder.pdf It's really very kind of U to help me! |
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November 1, 2020, 09:13 |
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#8 | |
Member
Bineet Mehra
Join Date: Aug 2013
Posts: 61
Rep Power: 12 |
Quote:
thanks a lot |
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Tags |
boundary layer mesh |
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