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Need help with simulation (constraints etc.)

Question asked by Eddie Chua on Jan 18, 2018
Latest reply on Feb 5, 2018 by Ryan Dark

Hi all, I'm currently doing a project and am tasked to design a rectangular chamber to withstand certain vacuum and/or positive pressure.

 

I've come up with the design. However now the issue is with simulations that I should be doing on the chamber.

 

Are there any rules or steps to ensure an accurate simulation?

 

I've been running a few iterations (following some steps I found online) and I'm not sure if I can trust the results. Though I'm rather certain it shouldn't fail since the pressure involved is low, but I'd like to have some accuracy to show for my report.

 

So generally, I would select a Static Study (I've seen some comments on doing a buckling study, but I've yet to look into it).

 

Then apply pressure on the inside/outer walls of the chamber (1bar vacuum or 3bar pressurised).

 

What I'd like to ask is:

 

1) Restraints. If my chamber is to be rested on a frame (not nailed or bolted), how do I restraint it? I've seen some comments suggesting Inertial Relief, but some other comments say it gives quite some error.

 

2) Mesh. I selected Standard mesh at 5mm. I understand I need to do mesh independence/convergence tests, but the max stress still trends upward while my computational power starts to suffer. Can't seem to reach a convergence point. I've seen suggestions to do H-adaptive studies. Is that a possible solution? Also, how would I know if the adaptive study reaches the percentage accuracy by the fifth iteration?

 

I've attached a picture of the chamber without its cover below.

 

https://imgur.com/a/rBSBq

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