CAVITATION "no CONVERGENCE in non-cavitating flow"

ROOZBEH

Hi;

I want to model cavitation. I recently work with Fluent6.1.22. At the beginning of solution I work with a non-vavitating condition(high outlet pressure 50bar with my operating velocity 13m/s). If I turn on only the flow equations, the solutions converges; But at the same non-cavitating condition, if I add cavitation equation to the other equation,I do not have convergency(turbulence eq. converges but continuity do not converges) I did not have at least this problem with fluent6.0.12 !!!!!!! What settings are required for cavitating flow in this new version?

Thanks.