Axial fan boundary conditions (BFM)

[GabrieleMorvillo]

Good evening everybody.
I apoligize in advance for the banality of my question, but I am facing some problematics I did not expect.
I am currently trying to run some symulations on NASA Rotor67 using the Body Force Model (implemented in the GIT branch feature_turbo_bodyforce) but my issues are connected with boundary conditions in general.
I am imposing total conditions at the inlet (Pt = 101325 [Pa], Tt = 288.15 [K]) and static pressure at the outlet (P = 12600 [Pa]). The symulation is then run up to convergece (RMS < 1e-8).
The fact is that when I postprocess the data I find:

• Both the BC are not respected, especially the outlet one;
• The flow shows regular behaviour in the straight outlet section until it develops an unreasoable bubble of high P and T near the
  outlet hub.
  These isues are further enhanced as I refine the grid more and more.

Even though this is just very short semplification of the problem at hand, I would like to know wheter this issue can be related to my the model I am using or rather to some wrong settings. I have been told that the RMS instability at the outlet hub is not unusual in SU2. How can I hardly enforce my BC? I do not understand why I get an inlet different from what I set. Moreover is there any way to impose a mass flow outlet condition?
Thanks for the attention.