block the back flow from the outlets
 

Dear all
Hello!

I want to simulate a cube in transient with one inlet and two outlets which is over pressurized by about 10 Pa. first only one outlet was set to pressure outlet and the other to wall. After it is converged, I set the other outlet to pressure outlet with zero Gauge pressure to find out how much it takes to release this 10 pa of over pressure and get in to about 0 pa.
When I did this, I had a lot of back flow from the first outlet in to the domain, so pressure was never get back in to the 0 pa!
So, is there any way to block this back flow, to not maintain the pressure?
thanks.