Problem while solving a backward facing step problem

Hi all,
I am trying to solve a backward-facing step problem using SimNet. I have created a mesh using SimNet only and gave proper BC. But in this case, my solution is not moving at all. It is not improving after running a long time and loss is also not decreasing.
Also, I am not understanding, how to create validation data for such problem as I don’t have an OpenFOAM case file for it.
I am attaching my code (5.5 KB)

Please help

Thank you

Thanks for posting this, I will try to get some help. Just for completeness can you provide some information about the O/S and GPU that you are using.

Thanks for your patience.