Jump in Residuals

ryzd · March 1, 2011, 18:30

Hi all,

I am using FLUENT to run a 2-D laminar natural convection problem. While I was running the simulation I noticed a couple of strange jumps in the residuals after about 14000 iterations and again after about 17500 iterations. The residuals return to where they were after a few iteration, but I was wondering if anyone knows why it would do this.

P.S. I'm trying to attach a picture to show a plot of the residuals.

[IMG]C:\Users\Ryan\Desktop\Untitled.jpg[/IMG]

DoHander · March 1, 2011, 22:39

Judging after your residuals your solution is converged, the oscillations between 1e-08 and 1e-10 probably means you are at the limit of your machine precision, I think they are not looking strange.

If I'm wrong please correct me,

Do

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March 1, 2011, 22:39		#2
DoHander Senior Member Join Date: Nov 2009 Posts: 411 Rep Power: 21	Judging after your residuals your solution is converged, the oscillations between 1e-08 and 1e-10 probably means you are at the limit of your machine precision, I think they are not looking strange. If I'm wrong please correct me, Do