Decline Convergence for finer mesh - buoyantSimpleRadiationFoam
I was running buoyantSimpleRadiationFoam solver for a 2D square cavity(1m x 1m) problem. I found good results (reached convergence criterion, 1e-06) for a mesh size of 120 x 120 and it took around 19 minutes (11805 iterations) execution time. For same problem, all solver and scheme settings are same, for 500 x 500 mesh size, it took more than 8 days (184826 iterations) to reach same convergence criterion. That was not expected. I was expecting execution time like (19 min * 17) about 6 hours. Could anyone tell me why it is taking such a long time to converge for finer mesh?
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