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I have this problem. I have a cylinder filled with a hot Nitrogen gas

(340 K) under 3000 psi pressure. The cylinder is exposed to the air

and I need to find a temperature distribution in this system as a function of

time. I am using Heat Transfer model -> Non-Isothermal Flow. The

solution does not converge. Well, it kind of does but it's somehow the pressure dependent. If the gas is at pressure = 1 Atm or slightly higher everything is fine but when I set P_nitrogen > 100psi (and in fact I need 3000 psi!) comsol stops working. How come it cares what pressure I have?

Any ideas?

Thank you!

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# Need help with Comsol (Heat Transfer Module)

Can you offer guidance or do you also need help?

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