[sankarv]

I am a new user of OpenFoam and I am trying to set-up an under-expanded supersonic jet issuing into an open atmosphere.
I am using the rhoCentralFoam and it has an example for the a similar jet.
Even though I can just copy the b.c. files (p,T and U) from the tutorial, I would like to better understand the various keywords in these files.

For example,
Jet_inlet
{
type totalPressure;
value uniform 300000.0;
p0 uniform 300000.0;
U U;
phi phi;
rho none;
psi psi;
gamma 1.4;
}
I do not understand all the keywords here. what does p0, phi, and psi stand for ?
I saw another example where all of the above keywords are not used ?
Is there any documentation for what kind of keywords must be specified for what
kind of boundary conditions ? Somebody please help.

Thanks
Vaidya