Hi there, i'm doing a reaearch project regarding sub-marines and such. More or less i'm attempting to see deformations in parts under uniform pressure (water pressure at different depths). The issue i keep having is simulation is pretty hell bent on making set a fixture or bond of some kind. Kind of negates me attempting to see uniform pressure

How should i go about this?

Picture a sphere or a hotdog shaped cylinder that would be pressurized from all external surfaces