[AlezXander]

I am simulating the flow in a channel with the density based solver in Fluent. I understand that a velocity inlet boundary condition is not recommended for this case, it is better to use for example a pressure inlet (Fluent warns you if you check the case with a velocity inlet).

However I want to use a specific velocity profile using a UDF. Should I just compile the velocity profile and use it on the velocity inlet BC or is there a more suitable way of doing this?

Thank you for your time.

[LuckyTran]

The issue is that, for compressible flows, there is a supersonic and subsonic solution that will both satisfy this velocity profile. If you are 100% sure you are trying to constrain a velocity profile, then use a velocity inlet BC.

[AlezXander]

I understand, thank you for your answer.