Done boundaries, but cannot run calculation

stephanie tahary

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Nov 13, 2025, 12:21:34 PMNov 13

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Hello, I'm a new user of THERM 7.8 and I'm just setting up the software. Can you help me why my model can't calculate? I have already divided the material into small piece, also there is nothing problem with the boundaries.

any help would be much appreciated. thanks.

thermal window plan a-1.THM

Robin Mitchell

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Nov 13, 2025, 2:11:38 PMNov 13

to stephanie tahary, THERM

I think the issue is probably that there are way too many polygons in the model. In particular, the large frame cavities should all be one polygon, not broken up into many small polygons.

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Robin Mitchell

Building Technology and Urban Systems Division
Energy Technologies Area
Lawrence Berkeley National Laboratory

Robin Mitchell

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Nov 13, 2025, 6:29:00 PMNov 13

to stephanie tahary, THERM

I was able to get the file to run after a huge number of simplifications, deleting points, etc

The file was run in 7.8.80.

I have attached it -- the Boundary conditions are just the defaults -- NFRC Exterior for the exterior.

Also, I rotated the file so that the exterior of the model faces the left and the interior faces the right.