I am calculating a propane catalytic combustion with single step surface and gas reaction scheme. I set the under relaxation of energy to 0.8 and monitor temperature seems keeps unchanged after a huge number of iterations.
when I modified the under relaxation factor of energy to 0.9, the monitor temperature would increase 100 k higher and keep constant. when I further increase energy under relaxation factor, the monitor temperature would go higher. when I set the under relaxation factor to 1, the case diverged immediately.
I wonder how under relaxation factors will effect results and convergence. How can I determine the case is fully converged?