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How to estimate uncertainity during simulation

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Old   February 17, 2012, 07:24
Default How to estimate uncertainity during simulation
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Sudhakar P
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Hi
I am monitoring a CFD simulation with performance numbers (Total pressure loss).I have noticed that there is an oscillation of the performance number for every iteration(Variation in the range of +/-2.5%).Kindly let me know how could i account those variation?

Thanks in advance
Sudhakar P
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Old   February 17, 2012, 09:12
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Ries Bouwman
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Hi sudhakar,

That depends on the physics of your simulation.


I assume it is a transient run?


+-2% is not at all abnormal.


If this answer is unsatisfactory, please provide more details.


Regards,


Ries Bouwman
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Old   February 18, 2012, 07:31
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Glenn Horrocks
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If your simulation is steady state this FAQ is for you: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Even if your simulation is transient many of the things discussed are relevant.
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