Trusting Cosmos for pressure vessels

Has anyone done any pressure vessel work on Cosmos designer?I've got two different vessels, one with internal pressure and onewith external. I ran them both, I'm just not 100% sure I trust theresults. The way it wanted to deform the semi-ellipsoidal tank headseemed very biarre. Any input?

(note: I am NOT going to trust Cosmos for the final design, I'llcheck it by hand or even have it coded. Also note pressures arerelatively low: 100 psi.SolidworksSimulation