Hi,

I know the question has been asked to death b4 but I have difficulties in tracking the answers that can specifically answer my questions:

1. How to know when my solutions have converged? What I did was to run it using the default convergence criterion in the residual pop-up menu and as long as the curves haven't become horizontal I add the zero's in the criterion. Is that the correct way?

2. When to stop the iteration? I read somewhere that as long as the 5 numbers in the console (print off of the residual values) e.g. 5.2661e-06 are not the same for 50 iterations than I have to continue iterating. The problem is my residual curves have long gone into a horizontal mode but the 5 digits are still experiencing +/-0.2000e-06, small in my eyes...but I don't dare stop the iterations. Was what I read true? What's the range of fluctuation that is safe for me to stop my iteration then?

Thanks

You should monitor the parameters of your interest,say the drag or average temperature of a certain surface, etc, to decide whether the solution is really converged or not. It is more realible than monitoring the residuals.

Moiami,

1 if u look at the residuals and all the residuals values decreased by 3 order then it would be considered as converged results. And when any values remain constant ie horizontal after getting few at least 2 order decreased then it would be considered as converged. if not then never user 0 in the covergence criterion but decrease the under reluxation faction in solve>control>solution menu. and see the effect.

2 if within 50-60 the values of all residuals get 3 order decreased then it is not considered as converged then put another 0 in the converge critera to allow run more iterations.

go ur own. goodluck

Alamgir