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Experimental Results and CFD results comparaison

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Old   September 12, 2022, 18:58
Default Experimental Results and CFD results comparaison
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saadoudi messaoud
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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.
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Old   September 13, 2022, 07:14
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Glenn Horrocks
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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.
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Old   September 14, 2022, 07:28
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Quote:
Originally Posted by ghorrocks View Post
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
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