Hi,all: My calculation is unsteady. In my model, there are one inlet and two outlet. I had known the flow rate curves of inlet and outlets, which are vary with time, so the volume fraction at each outlet is also varied with time. Any pressure conditions are unknown. How to set the outlet boundary conditions? Help me ,please.

You could try to use Outflow boundary condition.

However, if the volume fraction varies with time, you have to use UDF.

Hi

ap

Thanks, ap. My volume fraction varies with time. I had write a UDF file, and compile successful. But there isnot a udf option can be chosed in the outflow interface. How to operate the UDF of outflow?