Convergence Problem

Hello Everyone!

A beginner of COMSOL software calls for help. Even though it is a thorough model with simple geometry, it doesn't converge.

When I add Heat Source term to the model it fails to converge if the range is selected to end around 20ms. Practically it shouldn't bring up any problems since Qgen term kicks in until 723K.

To me it feels like a solver problem. The values and material info are taken from an article meaning they are supposed to be correct.

Any ideas to solve this?

Thanks in advance.