Biphasic simulation (GVF 80%) - Overflow problems

Robbe

Hello, I´m trying to run a biphasic (water-air) simulation in a rotor with high percentage of gas (80%). I always get a fatal overflow message for the linear solver (with an F in the last column) after 50 iteractions aprox no matter what bondary condition I put and with automatic initial values.

I´m using a combination with total pressure and flow rate conditions (bulk mass or velocities or mass of each flow, etc..) in the inlet and outlet, and viceversa; ; a water bubble of 0.1 mm; a k-e turbulence model; a blend factor of 0 to get a initial value for a High resolution scheme; a Grace correlation...

I already simulated this rotor with monophasic flow and biphasic with 20% of GVF without problems.

If there is anyone that can give me advices for high gas fractions simulations, please let me know.

Thanks, Robbe