Hello dear,I wonder if Fluent can simulate a partially open wall: One side of the wall is colse and the other side is controlled by a valve and open partially with time. Can UDF do this? So many thanks for your help.

read the sliding mesh tutorial

Thank you very much. I know the sliding mesh can do it. But I want to know if I can do it with just a simple tube, then change the time-dependent boundary condition (gradually open)? Because I think it will save CPU time.