u/AdvertisingFun3739

Hi, I am currently researching methods of indirectly simulating micro-riblets to study their drag-reducing effects on airfoils, and want to try a slip velocity BC (i.e. setting velocity at the wall to a non-zero value) as this is known to replicate their behaviour.

However, I am not currently aware of any way to implement this in Fluent, as the only options directly available are zero-shear and no-slip. Is there a way to create a slip velocity via UDF or something similar? Cheers