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p_rgh outlet boundary condition for atmospheric simulation

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Old   September 9, 2015, 08:52
Angry p_rgh outlet boundary condition for atmospheric simulation
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Raphael Santos
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Hi all, can someone help me?

I'm having trouble understanding boundary conditions for p_rgh. For example, I'm using the buoyantSimpleFoam solver to simulate atmospheric conditions. To sum up, the flow with buoyant effects.

At first I created a great computational domain, with height of 200 m. For now, I set every face as a walll except inlet and outlet. For inlet, I specified:

U:
inlet
{
fixedValue type;
uniform value (10 0 0);
}

p_rgh:
inlet
{
fixedFluxPressure type;
}
P:
inlet
{
type calculated;
}

I am in doubt about what boundary conditions I will need to specify for the outlet.
Because p_rgh presents a small variation along the z-axis, the axis of gravity direction. I understand that p_rgh = p - rho.g.h, so there would be no change in the direction of g, right?

Thank you,
Raphael
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