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UDF Wall functions conundrum

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Old   June 18, 2011, 19:25
Unhappy UDF Wall functions conundrum
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Can anybody please tell me what DUPLUS is the the following UDF file?

I am trying to model my wall function such that in the log-law region,
where y0+ is z0*utau/viscosity.
z0 is just some value i will input.
Can anybody help me program this macro? or at least guide me how to do it? i have read the UDF manual and i'm still clueless.

Please advice

thank you
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