In tutorial 11 bouancy driven flow around a heatd fin in that tutorial i am vary the mesh size and base temp value. but tha values are not converged upto 30000 itera

in star_uguid they said use trasient analysis for conjugate heat transfer process. how we do this problem in traisient mode. how we define the time limits. thanks in advanse

Refer the tutorial with transient case. In buoyancy driven flow you have to use Pesuedo transient approach for steady state cases. Further you should use double precision solver.