[jeffery0630]

I copied the case from rotatingFanInRoom and modified it for my problem. This is an incompressible PimpleFoam case. Then I changed the case to model a rotating valve in a cylinder.


I have a constant velocity on the inlet, and I want to measure the pressure on the outlet, and back pressure on the inlet.

The rotatingFanInRoom specifies U like this:

inlet
{
type fixedValue;
value uniform (-0.1 0 0);
}
outlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}

The pressureInletOutletVelocity BC I copied from rotatingFanInRoom is not giving me good results. I tried replacing the outlet BC with zeroGradient but the simulator blew up after about 7 hours. But I'm not sure where to place the blame since I changed half a dozen other things at the same time.

Is zeroGradient the right boundary condition for this type of problem?