I am trying to analyze air compressor in fluent
 

I am trying to analyze air compressor in fluent
I have a geometry created in solidworks for air compressor with inlet casing fins and outlet and inside compressor blades.

I am trying to do cfd analysis using fluent.
What boundary conditions should i try?
I tries pressure inlet and pressure outlet but the model diverges
even tries mass flow inlet and pressure outlet then x-momentum diverges.

Which model I should use i used LES solver and Spalart-Almaras solver. but got divergence in both models

Can anybody help me out with this?

Thanks

Firstly, try Fluent subforum and some images of your problem (Mesh, BCs etc.) would help the readers to comment precisely..

It sounds like you have a problem with your setup (either a mesh or a boundary condition problem). Or it may be a less serious problem, like a bad initial guess.

A pressure inlet & pressure outlet is the most robust boundary condition pair. If you cannot get your simulation to work with those, then you have a moderate/serious problem. Make sure your mesh is reasonable quality. Make sure your boundary conditions are correct. Make sure your initial conditions are reasonable. Try a simulation with constant material properties before jumping into doing full non-linear properties.

Few details of my air compressor analysis problem
 

Thanks for your reply.
Below I have inserted images which are self explanatory

I am stuck with models not behaving as they should.
I did all manual calculations for air compressor. Its outlet temp. should be upto 200 Deg.Celcius. But in analysis it is something vague value.
I tried K-epsilon model with pressure based solver in fluent. the pressure ratio is 3.5 bar.

Kindly suggest something so that I can carryout its analysis.

Thanks :)