Some parts no contact on Heat transfer

Hi Simscale power users,

It is an LCoS optical system for AR glasses. I fed heats to 2 parts and got the acceptable results.
https://www.simscale.com/workbench/?pid=598502105365514022&rru=106faea3-bedb-4b50-bb6a-4795ff209597&ci=3a29ec09-13e8-4b3e-a18b-2febd311c097&ct=SOLUTION_FIELD&mt=SIMULATION_RESULT

To reduce the temperature, it was added 3 plates using freecad program export to step file.
And the result was strange. The center became hotter and other blocks were cooler.
https://www.simscale.com/workbench/?pid=6495889815205582713&rru=337af1bf-8d7c-4fa0-b5b3-ed8b242e4121&ci=b8e0c59e-a055-45ca-b58d-f6ac899008e9&ct=SOLUTION_FIELD&mt=SIMULATION_RESULT

I found a message at ‘ simulation runs ‘ stage. Several parts became ‘ no contact ‘.
Hope you give me some advice why they split up.

Hi Jimmy, and thanks for using the forum!

I can see from your first model that there are some intersections, which need to be fixed:

Your second model also has intersections.

After fixing the intersections, I would suggest to perform a mesh independence analysis, specially use 2nd order elements for the thin walled parts, as explained in this article:

This will help you build confidence in the results.

If you received a message warning about parts not being in contact, please also review your model to make sure that the contacts are correct.

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Good Work

How is going everything