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August 27, 2008, 05:36 |
Hello,
In my model, I need
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#1 |
Member
Ivan Lau
Join Date: Mar 2009
Location: Hong Kong
Posts: 56
Rep Power: 17 |
Hello,
In my model, I need to have two different wall functions because two walls have significant different roughness. Is it possible? Thanks, iL |
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August 27, 2008, 07:57 |
Yes, it is definitely possible
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#2 |
Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,900
Rep Power: 37 |
Yes, it is definitely possible, as you just define the two boundaries with another type or different properties than those of the other boundaries.
If such a boundary condition is readily available in OF I do not know. It should be fairly straight forward. Try to look into the k-omega for rough surfaces posted in http://www.cfd-online.com/OpenFOAM_D...es/1/5791.html but be careful I am advertising for my own work and it has not yet been tested/verified. Best regards, Niels
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August 27, 2008, 12:36 |
Hi, Niels,
Thanks for your
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#3 |
Member
Ivan Lau
Join Date: Mar 2009
Location: Hong Kong
Posts: 56
Rep Power: 17 |
Hi, Niels,
Thanks for your reply. I just looked at your thread. However, I am actually looking for some simpler solution. Currently, there are variables "kappa and E" under wall function of k-epsilon models. I thought I can simply specify different E (small E for smooth surface and higher E for rough surface). I guess I need to modify the code to achieve this. Am I correct? Best Regards, iL |
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August 27, 2008, 13:43 |
I do not know, as I have not u
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#4 |
Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,900
Rep Power: 37 |
I do not know, as I have not used in "build-in" wall function, and thus have not spent time looking into the source.
Best regards, Niels
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