Converging issue for 3D subduction model with oblique trench shape.

[Peigen-L]

Hi, teams

I am testing the subduction with the oblique trench using Underworld 2.14b.
Here is the test 3D model I create for the oblique subduction:
https://github.com/underworld-community/Peigen-HPC/blob/main/Oblique_128.py

I run the model under resolution 128x48x48. The low res model would not converge after 50 iterations after time-step > 40.

Then I upgrade the model by increasing the resolution. The high-resolution model, 258x96x96, would run as normal (converged after 2 iterations).

However, I still want to test the low resolution model first.

I wonder why the low-res model doesn't converge like the high-res model?

[Peigen-L]

Closing the issue. The high-res is mandatory to produce the correct model results.