Code Works with Box Mesh but Fails with Actual Mesh – Request for Guidance

Description of the Problem

I have developed a simulation code that works correctly when tested with a simple box mesh. However, the code fails to run or produces errors when applied to my actual mesh. The actual mesh represents a more complex geometry, which is critical for my study.

I suspect the issue could be related to:

1. Memory constraints or computational requirements when handling the complex mesh.
2. How the actual mesh is loaded or preprocessed in the code.
3. Potential compatibility issues between the mesh file format and the simulation framework.