Simply write the UDF in notepad.save it. interpret it in fluent. Once it is compiled it will be available in the drop down list in the boundary condition panel. Put it in the wall boundary condition panel. Check the UDF manual for writing the UDF.

Thanks for your reply Joyti...

I think you misunderstood my question. I know how to write a UDF and hook that to Fluent, but I'm looking for a source code or something else can help me for writing the partial velocity slip UDF for 3D curved geometries!

Can anyone help me?

You can use DEFINE_VECTOR_EXCHANGE_PROPERTY to specify custom slip velocities for the multiphase Mixture model.

DEFINE_VECTOR_EXCHANGE_PROPERTY( name, c, mixture_thread,

second_column_phase_index, first_column_phase_index, vector_result)

Thanks for your reply Md. Rafsan Nahian

My multiphase model is VOF and my goal object is temporarily in a single phase section (water). The big problem is that FLUENT uses global coordinates to its calculations, but all the slip velocity boundary conditions use local coordinates to their calculations and I have to transform data between those systems!

Hi,excuse me. do you have maxwell and chofskie for temperature jump and wall slip ? i wanna this cod and i tried as long time but nobody help me ..... can you help me please!!!!!!!!!!!!

Hi, Alireza Qaderi , I also want to write UDF for partial slip and no slip boundary condition. I hope you have completed your task. can you share your code through email or suggest any useful link for it? I will highly appreciate.