Hi!
The error is quite simple. For a convective heat transfer analysis, we only need a single volume (the flow region) for the simulation. The solid volumes, such as walls, humans, etc, should be removed from the CAD model.
If you don’t do this for a convective heat transfer analysis, you will run into a multi-region mesh error. In your case, I believe the volume named “Solid 3” already represents the flow region, therefore the following operations are necessary:
- Remove the sheet parts from the model (these are never desired in simulations using OpenFOAM/Code Aster). Deleting them should work just fine
- Use a boolean (or combine, depending on the CAD software) to subtract the solid parts from the flow region. This analysis type requires a single volume only (the flow region). The solid parts don’t need to be in the geometry.
As a result, you should obtain a flow region with the “negative” representation of the solids. Again, the model imported should contain a single volume, like this:
Cheers