[phsieh2005]

Dear OpenFOAMers,

In my flow domain, i have one inlet and one outlet. Actually, these are both openings. I have an impeller inside, so, whether it is an inlet or outlet depends on direction of impeller rotation. How to specify BC in this situation?

Thanks!

Pei-Ying

[tomf]

Hi,

Not sure if it will work, but maybe you can use totalPressure for p combined with pressureInletOutletVelocity for U on both sides.

Regards,
Tom

[phsieh2005]

Hi, Tom,

Thanks for the reply!

This is what I used:

U
inlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
outlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}
--------------
p
inlet
{
type totalPressure;
p0 uniform 0;
U U;
phi phi;
rho none;
psi none;
gamma 1;
value uniform 0;
}
outlet
{
type totalPressure;
p0 uniform 0;
U U;
phi phi;
rho none;
psi none;
gamma 1;
value uniform 0;
}
-----------------------

Laminar case seems to work fine. However, sometimes I got trouble with kOmegaSST model. But, that could be due to bad k/omega BCs/ICs. I am still learning turbulence modeling.

Pei-Ying