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-   -   How to estimate uncertainity during simulation (http://www.cfd-online.com/Forums/cfx/97450-how-estimate-uncertainity-during-simulation.html)

kpsudhakar February 17, 2012 06:24

How to estimate uncertainity during simulation
 
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

m9819348 February 17, 2012 08:12

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

ghorrocks February 18, 2012 06:31

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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