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Omega wall treatment change via UDF

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Old   February 14, 2024, 12:35
Default Omega wall treatment change via UDF
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Hello,


I work with Fluent and the default \omega treatment at the wall is given by what can be seen in this page.


I need to modify the value of the \omega, which according to several papers can be done with a UDF.


I have checked the available options in the UDF manual, but didn't find a way.


Does anybody here know how this can be done??


Thanks!
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Old   February 27, 2024, 11:41
Default K-Omega UDF - Modelling drag reduction effect by Sharkskin
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David Tyrrell
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Hello,

I am trying to achieve the same thing you were. Essentially I need to modify the value of omega at the wall to model the effect of sharkskin riblet drag reduction.

Did you ever manage to get a result in the end? Or if anyone else could offer advice that would be great, even if it were to say it is not possible in FLUENT.

Regards,
David Tyrrell
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Old   March 11, 2024, 05:03
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At the moment I am not actively developing the udf, but the last status is that I could set a constant omega in the whole domain.

I don't manage to fix it only at the first cell adjacent to certain walls...

Also managed to calculate the u*, which took me some time because I couldn't obtain the wall shear values of each cell ...
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