hi i am modelling a fuel cell ... 3 D geometry I have used a heat source term inside a porous volume. The trouble is that the solution is not converging for the order of the heat generation that i have given as input ( 9e9 W/m3)

After around 300 ierations, there is no significant change in energy residual, ( which starts at about 10e-4) and i get the results that i want, but if i continue the iterations till 5000 or more, the temp. keeps rising( and the solutions has stil not converged, residual keeps falling very slowly).

I have tried changing UR factors, but it does not make any difference. I await your suggestions. Thank you

change the curent number and do a significant change of UR.