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When is it converged?

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Old   February 6, 2008, 07:31
Default When is it converged?
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I am doing a study around and inside a front rotating wheel of a car and have some thoughts about convergence.

I get velocity residuals (rms) below 4e10-3, pressure residuals below 10-5, k and e residuals below 10-3. I have ploted too the SCx (or SCd) and SCz (or SCl), the Surface Drag and Lift Coefficients. I was thinking of making a statement of convergence.

As it would take days for all my residuals (still rms) to go down 10-4, let's consider SCx and SCz. I have checked their value at every 50 iteration step.and I get variations below 0.05% in the end. For me it looks like converged. Maybe I could check the standard deviation? But with which criteria? arbitrary?

I am not focus on one particularity of my flow (separation, etc...) but mostly its behaviour, so its difficult to judge on a specific criteria.

Thanks a lot for a good advice!

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