VOF Annular Flow
 

I am working on annular flow modelling in a horizontal pipe. I wonder wheter I can simulate annular flow as axisymetric( I will assume g=0 thus film thickness will be same in circumference section of pipe. when I simulate annular flow with VOF as 3D I couldnt get any satisfactory solution. How can I get bettet solutions? I use k-w as turbulence model. Thanks already....