Reply To: negative absolute pressure in multiphase flow

[Rob]

OK, another possible is the rate of phase change for the cavitation. They're generally a pain to converge well, so also look at time step. If the pressure goes negative it means you should have either lower density gas (it expands) or more gas: if the mass exchange is unstable you may need to switch to transient. By unstable I mean bubbles form & collapse quickly: the bulk mass fraction may remain relatively unchanged.