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saayo3 June 7, 2013 03:51

udf for Roughness Constant, Cs > 1
Hi, everyone,

I am modeling a domain that has the surrounding area with non-uniform & non-homogenous surface roughness, in which case the surface Roughness Constant, Cs, is outside the upper limit of the range (0.5 - 1.0) that can be specified in Fluent.

I desire to specify a value of Cs greater than 1.0 as has been done in previous researches, and this requires udf.

Pls., could someone kindly help me with the udf codes for writing constant-value Roughness Constant, Cs.

Thanks, and hoping to get a response soon.


nenazarian October 18, 2013 12:34

Hi Samuel,

I was wondering if you have wrote a udf for a wall roughness.
I was similar problem and I would appreciate your help.


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