Experimental Results and CFD results comparaison

ahmed abdelhamid · September 12, 2022, 18:58

Hello everyone,
I'm a beginner in cfd and I'm doing a steady state simulation for a centrifugal pump using ansy cfx, but I get CFD results less than Experimental Results within 5% deference,
So my question, is it necessary to have CFD results more than Experimental Results?
Thanks to all.

ghorrocks · September 13, 2022, 07:14

Sometimes the CFD results are higher, sometimes lower. There are many, many things which cause errors, so it could be either way.

See FAQ: https://www.cfd-online.com/Wiki/Ansy..._inaccurate.3F

And note that a 5% error is very accurate in some types of CFD (eg heat transfer) but very inaccurate in other types of CFD (low Reynolds Number flows). So whether 5% error is good or not depends on what you are modelling and what accuracy you require.

ahmed abdelhamid · September 14, 2022, 07:28

Quote:

Originally Posted by ghorrocks

Sometimes the CFD results are higher, sometimes lower. There are many, many things which cause errors, so it could be either way.

See FAQ: https://www.cfd-online.com/Wiki/Ansy..._inaccurate.3F

And note that a 5% error is very accurate in some types of CFD (eg heat transfer) but very inaccurate in other types of CFD (low Reynolds Number flows). So whether 5% error is good or not depends on what you are modelling and what accuracy you require.

Thank you very much

September 12, 2022, 18:58	Experimental Results and CFD results comparaison	#1
ahmed abdelhamid New Member saadoudi messaoud Join Date: Mar 2022 Posts: 4 Rep Power: 4	Hello everyone, I'm a beginner in cfd and I'm doing a steady state simulation for a centrifugal pump using ansy cfx, but I get CFD results less than Experimental Results within 5% deference, So my question, is it necessary to have CFD results more than Experimental Results? Thanks to all.

September 13, 2022, 07:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Sometimes the CFD results are higher, sometimes lower. There are many, many things which cause errors, so it could be either way. See FAQ: https://www.cfd-online.com/Wiki/Ansy..._inaccurate.3F And note that a 5% error is very accurate in some types of CFD (eg heat transfer) but very inaccurate in other types of CFD (low Reynolds Number flows). So whether 5% error is good or not depends on what you are modelling and what accuracy you require. ahmed abdelhamid likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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