cavitation

Perelli Maxime

Hi, Does anybody use the cavitation model from Star-CD? Because my work goes on a hydraulics valve with 2 pressure boudaries (one for the inlet with a pressure about 500 bar, the second for the outlet with a pressure of 1 bar), but as I do a steady calculation: first I don't have the convergence; second I have crazy values ( velocities about 2000 m/s!!! and negative absolute pressure!) So I tried to turn on the cavitation model and followed the manual's instructions but the calculations don't seem to start! Could anybody help me? Thanks

Maxime