[Gerry Kan]

Howdy Foamers:

I have some question about the configuration of the p, p_rgh, and ph_rgh boundary conditions for single phase compressible flows where hydrostatic effects are important.

1) under what circumstances should I use "prghTotalHydrostaticPressure" (which requires ph_rgh) and when is "fixFluxPressure" sufficient?

2) in terms of defining boundary conditions, are p and p_rgh mutually exclusive. That is, if you define one, do you have to leave the other as "calculated"? On the other hand, the hotroom tutorial. also leaves both p and p_rgh as calculated so I am a bit confused.

3) following (2), I know the pressure (p) distribution around my solution domain. Is it possible to define p and let the solver work out the p_rgh?

Thank you very much in advance, Gerry.