finite volume, volume of fluid, boundary integral method

Hello,

I'm trying to model a cavitation air-bubble in water under ultrasound waves. For that I need to use a Boundary integral method to solve the Laplace equation. The finite element method I try to use until now is not stable for my problem.

Is there any boundary integral method (using Greens function) module for Laplace equation in Comsol 4.2 or 4.3 available?

Thanks for your answer!

Karl