Is there an alternate way of selecting all the interior/exterior surfaces of model then manually selecting them? I know other fea packages would had ways of doing this. Boxing in helps a little but not to much when you have most of surfaces selected.
I did not see the option for selecting tangent surfaces. I am aware Ansys has that feature. I will have to look closer.
As for what surface to apply loads to. I thought of that but used the interior surfaces so reports would look a little more understandable to the not so sharp. And because it's a little more accurate as the surface area is less on the interior and the shape is a little different. yeah they are all small variations and well within the range of information i am looking to get out of the results.
You could create a zero offset surface of your vessel on either the inside or outside face and analyze that. This might be easier than defining the faces in Simulation.