Fluent Convergence Problems

Vidya

Hi,

When i ran a steady flow simulation in Fluent, the solution converged after 60 iterations. Then i tried to plot the various parameters like velocity vectors, contours etc. When I selected the surfaces that I wanted these to be plotted on, Fluent just crashed (i.e. just vanished from the screen). Why does this happen?

I ran the same case again. This time I got convergence after 70 iterations. Again, it crashed when i tried to plot something. I ran the case again, and this time convergence was obtained after 90 iterations. Then crashed.

I'm wondering why the solution is converging at a different iteration each time. And why does it crash?

Any suggestions?

Thanks