compressibleInterFoam p and U BCS
 

I have used the totalPressure for P inlet, fixedValue for P outlet and PressureInletoutletvelocity for U inlet and inletOut for U outlet. But the solution shows that the maximum velocity in the field continuously decreases and eventually the minimum pressure continuously increasing. I have tried other BCs combination, but they don't work. Could someone give any suggestion on the BCs for commpressble two-phase flows?