Hello Bhaskar
Can you let me know what type of analysis are you trying to perform? Is it a CHT (Conjugate Heat Transfer) problem which involves both fluid and solid bodies? If yes, then Discovery Live cannot solve a CHT problem. This functionality (CHT) is coming in Discovery 2021R1 release.
Also I can see that you have specified Mass flow and flow velocity. Are both of these Boundary Conditions specified at the inlet. If yes, then you should specify only one of them.
It is also not possible to apply sun's radiation on the surface.
You are navigating away from the AIS Discovery experience