[supermanks]

Hello all,

I'm trying to simulate the flow through a centrifugal compressor (geometry made in Creo 1.0, exported to ICEM for meshing, and Fluent for solution). I have given a mass-flow-inlet BC at the inlet, and I have given the static pressure at inlet where it says "supersonic/initial gauge pressure", and the mass flow rate in the corresponding field. Also, I created monitors of "area-averaged" and "mass-averaged" "static pressure" at inlet, just to make sure. However, as the iterations began, it was surprising to find that the averaged static pressure was not the straight line of the constant BC value that I had expected, but was a value different value. Afterwards, it appeared to approach the input value, but it straightened out, and never reached the BC value of static pressure that I had input.

I am totally confused regarding this as I do not understand if I entered the wrong pressure in the "supersonic/initial gauge pressure" blank, or if my mesh is not good enough, or if it is some other factor at play, but I thought fluent worked its way to the flow field inwards from the BCs that we input, and hence the BC monitors should show a graph of constant value that was input. I'd be really grateful if anyone could give their input as to what is going wrong here. [Operating pressure = 0, and all other pressures entered at absolute values, as learned from different tutorials] Thanks a lot !