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Residuals in PimpleFoam

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Old   May 14, 2018, 05:37
Default Residuals in PimpleFoam
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manu ebn
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Hi all

I have a very basic question:
What is a typical residuals behaviour for a converging pimpleFoam solver?

I think my simulation converges (see attachment), since the final residuals of the simple-iterations continuously decrease.
However, the initial residuals of the PISO-algorithm remain at a high level...

Is this a typical behaviour?

Any experience on this is very welcome
Best, Triggin
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Old   May 21, 2018, 15:58
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Is indeed typical behavior.

The residual goes haywire on the final iteration because this one has no under-relaxation urf = 1. In a converging PIMPLE solver, you never make it to the final PISO step and exit while still in SIMPLE mode.
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Old   June 7, 2018, 07:50
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Just to add to the answer, here is a link which might also be helpful for you understanding the residuals
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convergence, pimplefoam, residuals

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