[damian_1881]

Hello,

I am struggling with non-coformance mesh. I have created two mesh files (one for fluid, second for solids). I introduced the flow (4.8kg/s) within the fluid domain (pipe) and I used wall coupled with mapped option to thermally couple two meshes.
The pipe steel thickness (solid domain) external surfaces are set to constant temperature. I would like to run until steady state solution is reached, so I want to make sure that total heat flux from fluid surface is the same that is coming to solid surface, so the balance should be 0.

Unfortunetly it is behaving strange. Starting from really high value (-5,000,000W) and increaseng to -50,000W after 8,000 iterations where fluctuates and never converges.

gents, any idea how to fix that, how to fins heat leak?, why the total heat flux at contact pair is no zero?

thanks,