Advices about cavitation/single phase flow
 

Hi all my friends,
I'm studying a problem in which cavitation is involved and it's not negligible in the domain.
The domain in mainly composed by a series of rotors and I'm trying to solve the problem by mrf and sliding mesh.
Physics of the problem should require turbulent +multiphase (mixture) + cavitation models, however I'm having a lot of problems in converging the solution because as you know, cavitation problems are in general difficult to converge.

Main goal is to calculate power required by the rotors.

So, I was thinking about running my problem in single phase flow:

Options are:

1- Loop across cells and faces at every iteration to find pressures<vapor pressure and force them to the vapor pressure (UDF)

2- Let cells and faces to have negative absolute pressures, and later considering that in these cells cavitation occurs

So my question:
a) Does it make sense to run my problem in single phase?
b) If a) is true, what's the best option between 1) and 2)?

Thank you,

Daniele