Howdy, 

I just started modeling a simple burst test of a sphere filled up with gas under increasing internal pressure using a fluid-structure interaction (FSI) problem. I modeled only a quarter of the sphere counting on symmetric boundary conditions and filled the interior of it with water using the Volume Fraction Tool. The problem arises when the initial conditions of the fluid must be set. Until now, I was not able to find a feasible way to do that, for instance, I tried the pressure cavity option in interaction and then in Load modules to set the initial pressure condition. Also, it seems that fluid inside of the quarter sphere, during volume fraction filling, is escaping due to ill-defined symmetry conditions imposed in both the Eulerian and Lagrange domains.

Any suggestions? 

Your support is greatly appreciated.