CAVITATION(similitude of two cases)

ROOZBEH

Hi all; I have had a problem with cavitation modeling at high speed(20m/s or 40m/s or 60m/s). My problem was the negative absolut pressure or a domain with pressure under vapor pressure in flow field.It is strongly wrong. Because suggestion of Mateus, I increased my velocity inlet from 0 to 20 by .5 increments and for each velocity I allowed Fluent to go 50 time steps.(each time step is 2e-5s)But at velocity 16m/s I again resieved a negative absolute pressure. Therefore I have decided to work with reynolds and cavitation number with low velocity and high Lch and vapor pressure as in Fluent tutorial. Is this a correct work. Please guide me for these problems