fan characteristics

keeper · December 5, 2011, 04:12

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.

ghorrocks · December 5, 2011, 05:22

Yes, use a momentum source and link the source term to an equation describing the fan characteristic curve.

keeper · December 5, 2011, 06:42

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??

ghorrocks · December 5, 2011, 16:42

You can put sources on boundaries, or define sub-domains and apply it to volumes. Whatever is most appropriate in your case.

keeper · January 26, 2012, 08:20

thanks a lot. I still have some issues concerning expressions. Is there any tutorial on that?

ghorrocks · January 26, 2012, 16:23

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.

keeper · January 27, 2012, 02:39

ok I'll find them. thank you again glenn

December 5, 2011, 04:12	fan characteristics	#1
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	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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December 5, 2011, 05:22		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Yes, use a momentum source and link the source term to an equation describing the fan characteristic curve.

December 5, 2011, 06:42		#3
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	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??

December 5, 2011, 16:42		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	You can put sources on boundaries, or define sub-domains and apply it to volumes. Whatever is most appropriate in your case.

January 26, 2012, 08:20		#5
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	thanks a lot. I still have some issues concerning expressions. Is there any tutorial on that?

January 26, 2012, 16:23		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	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.

January 27, 2012, 02:39		#7
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	ok I'll find them. thank you again glenn