Hello expert,
I'm trying to use HW CFD & AcuSolve to simulate some kind of tube & shell heat exchanger.
Attached is my model.

Since the structure in my model (tube, shell, fin) is very thin (2mm), so i don't prefer to use solid mesh for them.
I tried to use Thermal shell to define those parts.
However, after complete the setup, i tried to run the solver but it showed below errors:

Could you help check my model and give me some advices? or please help me modify the correct BCs.
Thank you very much!