Why do residuals oscillate after set no. of iterations? -- CFD Online Discussion Forums

January 25, 2024, 05:10

Why do residuals oscillate after set no. of iterations?

_martin_

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Join Date: Jan 2024

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Hi guys,

I'm modelling a heat transfer with a DO radiation model. After a number of converging iterations the residuals start to oscillate (as in the image attached).

Can anyone explain why this could be/ if this is an issue or not.

Thanks!

Attached Images

residuals oscillating towards end of calc.png (38.5 KB, 6 views)

January 25, 2024, 06:34		#2
MKuhn Senior Member Moritz Kuhn Join Date: Apr 2010 Location: Germany, Dresden Posts: 207 Rep Power: 17	One possible explanation is that your flow regime is not fully stationary. Turbulent flows are partly random, so normaly this is not an issue, if mass and energy balance is ok.

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