simulating bubble generation in water using T-junction

hi ,
I'm trying to simulate air bubble generation in water flow using T-junction . I sketched a 3D model in microfluidic module using level set laminar two phase flow . the problem is I have used different solvers in COMSOL but each time I receive error in comutation ( zero matrix , time adaptation interrupt ..) , can anyone help me finding a suitable solver for my problem.

thanks.