Fan boundary condition in CFX?

agastyamit · January 14, 2012, 14:11

Hi
can anyone please tell me how can i implement a fan boundary condition (as is present in Fluent) in CFX?

and also is it somehow possible to implement it somewhere in the fluid domain?

Thanks

ghorrocks · January 14, 2012, 20:02

The fan BC will just be some function of velocity and pressure and you can impose this as a CEL expression.

There has been plenty of posts on the forum about how to implement fan curves, this may be of use.

neha03sharma · November 21, 2016, 14:05

Hello Glenn,

I have to model a fan inside a domain in cfx. can you please send the link of post where I can find more information about fan curves

ghorrocks · November 21, 2016, 16:55

Have you googled fan curve?

neha03sharma · November 30, 2016, 14:31

Hello Glenn,

I looked for the material available online. I am able to simulate the fan, however my fan is not aligned to any global co-ordinate but is rotated about x axis. So, while adding the momentum term, I should add components in both y and z directions proportional to the angle that fan axis make with z and y axis?

ghorrocks · November 30, 2016, 18:17

Then you simply work out the components in the xyz axes. This is basic vectors.

Antanas · December 1, 2016, 08:30

Quote:

Originally Posted by neha03sharma

Hello Glenn,

I looked for the material available online. I am able to simulate the fan, however my fan is not aligned to any global co-ordinate but is rotated about x axis. So, while adding the momentum term, I should add components in both y and z directions proportional to the angle that fan axis make with z and y axis?

Maybe I don't really understand your question, but just in case, you can create additional coordinate system based on your fan and specify velocity relative to it.

January 14, 2012, 14:11	Fan boundary condition in CFX?	#1
agastyamit New Member Amit Agasty Join Date: Oct 2011 Location: CLZ, Deutschland Posts: 15 Rep Power: 15	Hi can anyone please tell me how can i implement a fan boundary condition (as is present in Fluent) in CFX? and also is it somehow possible to implement it somewhere in the fluid domain? Thanks

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January 14, 2012, 20:02		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	The fan BC will just be some function of velocity and pressure and you can impose this as a CEL expression. There has been plenty of posts on the forum about how to implement fan curves, this may be of use.

November 21, 2016, 14:05		#3
neha03sharma New Member neha sharma Join Date: Oct 2016 Posts: 6 Rep Power: 10	Hello Glenn, I have to model a fan inside a domain in cfx. can you please send the link of post where I can find more information about fan curves

November 21, 2016, 16:55		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Have you googled fan curve?

November 30, 2016, 14:31		#5
neha03sharma New Member neha sharma Join Date: Oct 2016 Posts: 6 Rep Power: 10	Hello Glenn, I looked for the material available online. I am able to simulate the fan, however my fan is not aligned to any global co-ordinate but is rotated about x axis. So, while adding the momentum term, I should add components in both y and z directions proportional to the angle that fan axis make with z and y axis?

November 30, 2016, 18:17		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	Then you simply work out the components in the xyz axes. This is basic vectors.