Hello @rszoeke, thanks a lot for your reply. I think I got what you mean, I think I just applied the boundary conditions for input surface heating flux but not output one. I want to perform this simulation like if my surface is heated from laser beam more or less at the center of surface and I want to see how the temperature gradient is going to spread on the same surface. I applied now convective heat flux (considering that for sure there will be free air convection with my sample). I applied then a surface heating flux (input heating source) to a face and convective heating flux to all the other 4 faces (for output heating flux). Now I’m able to launch the simulation but an error is occurring. I’ve modified the surface heating flux on one face applying it just on X axis considering what you told in your reply.
I’m going to repost the link with the variations I applied.
I really don’t understand what is the error occurring during simulation.
The link is the following one