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Old   August 27, 2008, 05:36
Default Hello, In my model, I need
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Ivan Lau
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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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Old   August 27, 2008, 07:57
Default Yes, it is definitely possible
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ngj
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Niels Gjoel Jacobsen
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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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Old   August 27, 2008, 12:36
Default Hi, Niels, Thanks for your
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Ivan Lau
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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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Old   August 27, 2008, 13:43
Default I do not know, as I have not u
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Niels Gjoel Jacobsen
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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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