How to estimate uncertainity during simulation

kpsudhakar · February 17, 2012, 06:24

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.

February 17, 2012, 06:24	How to estimate uncertainity during simulation	#1
kpsudhakar New Member Sudhakar P Join Date: Mar 2009 Location: Bangalore Posts: 10 Rep Power: 17	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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February 17, 2012, 08:12		#2
m9819348 New Member Ries Bouwman Join Date: Mar 2009 Location: Graz, Austria Posts: 28 Rep Power: 17	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

February 18, 2012, 06:31		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	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.