Convergence then Divergence
 

Does anyone know why my model converges for about 125 iterations and then begins to diverge quickly? I am modeling the heating of a small spot via a laser with forced convection over the spot...I'm also modeling species transport...it seems the velocity is what diverges first...

Re: Convergence then Divergence
 

try lowering your residulas to the values recommended in the User Guide. Also try starting with 1st order schemes