Thermal expansion for cryostat model

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Hi there,

I am new to using COMSOL and I am setting up a simulation to test the cooling capabilities of my cryostat. I have built up the model slowly, starting with a basic simulation to model the cooling power of my cryostat then making it more advanced to incorporate radiation and other sources of loss.

The final step that I am trying to incorporate into the model is thermal expansion specifically to test whether our sample will contract away from some surfaces due to thermal expansion. I have run an initial simulation however the results showed that every part of my model was connected together so they all contracted together, rather then showing whether the sample contracts away from other parts. From looking online, I think the issue is that I used "form union" rather than "form assembly". I have tried again to run the simulation using form assembly however it is not progressing past t = 0 in the time dependant study.

I am wanting help to set up this simulation properly to incorporate thermal expansion of the parts, and allow them to contract away from each other. Since the simulation is working properly when I use "form union" I am wanting to learn how to change the model to the "form assembly" situation. I am also curious to know if there is a way I can see what is causing my simulation to stall at t = 0 without waiting for hours to get an error message.

I am using COMSOL 6.3 on Ubuntu 24.04. I am happy to provide as much detail about the system as needed.



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