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Old   December 5, 2011, 05:12
Default fan characteristics
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Hello everyone.

I simulate generator thermal behavior with the fan on the outlet side of the fan. But this fan contains many elements which increases computational effort during solving.

My question is: Is it possible to replace the fan geometry with its characteristic (airflow vs. pressure drop)??

I heard that it is possible in Fluent but I don't know if it works in CFX.

Any reply will help.

Thanks a lot.
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Old   December 5, 2011, 06:22
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Yes, use a momentum source and link the source term to an equation describing the fan characteristic curve.
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Old   December 5, 2011, 07:42
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Thanks a lot. Just another question on which domain should I put it?? I have several domains that define generator and I would need to know where to define this equation. Is it on inlet domain??
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Old   December 5, 2011, 17:42
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You can put sources on boundaries, or define sub-domains and apply it to volumes. Whatever is most appropriate in your case.
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Old   January 26, 2012, 09:20
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thanks a lot. I still have some issues concerning expressions. Is there any tutorial on that?
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Old   January 26, 2012, 17:23
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Several of the tutorials use CEL expressions. I am not in my usual office today so cannot list them for you but I know the free surface flow over a bump one uses it and so do several others.
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Old   January 27, 2012, 03:39
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ok I'll find them. thank you again glenn
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