Converging then Diverging Residuals???

Erika Johnson

Hello,

I was wondering if anyone has ever had any experience with residuals that intially start to converge and then after several iterations (i.e. 25,000+), they start to diverege???

I am working with the Reynolds Stress Model and I have decent convergence (1e-05) on everything except continuity (1e-2). In trying to get continuity to converge I let the simulation run and now at 25,000+ iterations I'm noticing that my Reynolds stresses, y-velocity, k and epsilon are starting to diverge slowly...Is the simulation adjusting itself in order to get the continuity to converge???

If it helps at all I'm simulating a flat plate boundary layer with super super fine mesh and low freestream intensity (0.2%).

Any ideas???

Thanks so much, Erika