When it comes to divergence due to poor mesh quality, the two main workflows are trying to improve the mesh settings and/or cleaning up the CAD model around the problematic regions.
This article that I wrote shows the usual troubleshooting steps (which are essentially the same for every simulation). By following the steps in the article, you will notice that the simulation is diverging around this region:
Having a look up-close, you will notice a very small gap and a lot of thin faces:
Checking around the opening of the gap:
Judging by the model, and these small faces cleaning up the model is definitely a good idea. Thin faces and gaps are not really desired, in terms of mesh quality and simulation stability.
So if you are willing to clean up the model (which is usually my recommendation), that would definitely help.
Alternatively if you are not willing to clean the model, here are some things that are worth a try:
- Increase the value of the small feature suppression, to try and ignore the small details. The value that is defined for the small feature suppression needs to be larger than the details, so they are ignored.
- Using a hex-dominant meshing algorithm. The hex-dominant tool has basically an “built-in” filtering mechanism for small details, related to the cell size. If the topology is much more detailed than the mesh size, it will be ignored by the hex meshing tools.
In any case, using a clean CAD model always helps!