Heat Sink Test Case-1 w/OpenFOAM

Solver = buoyantPimpleFoam
An absolute semi implicit energy source term implemented(Only explicit contribution).
h (20 0) ;
I did not use a multi-region solver in order to simplify the problem. The only thing that interests me here is the flux given to the fluid domain. It would have been useful to run the simulation a little more and observe. It is a matter of curiosity how long it will take for the temperature to completely converge after passing to the steady state (when the temperature on the surface will not change).
Symmetry patch type used for right recurring blocks.
Visualized in Paraview.
Note : Switch 4K resolution to observe streamlines,otherwise it is blurry.