Help need to simulate flow around Contra rotating Fan
 

I am trying to simulate flow around Contra rotating Fan using Full Non Matching
Mixing Plane. I meshed my geometry in Autogrid5 and I am trying to simulate in FineTurbo. The flow is steady and incompressible with a blade speed of 1029 rpm. I use Spalart–Allmaras turbulence model with velocity inlet (68 m/s), pressure outlet (Radial equilibrium) as the boundary condition and I imposed Farfield velocity as 68 m/s. The Periodic angle for the front rotor is 32.7272 degree and 40 degree. There are nearly 6.5 million cells.

In the initialization of simulation, I gave 98500 pascal as inlet pressure and 90000 pascal as pressure in mixing plane. I ran simulation, after two iteration it say solution blow out, Process killed, Crashed. I tried with different boundary condition but nothing helped me. I am not able to figure out the problem.

Please Can anyone give me some suggestions to run my simulation.