# Fan boundary condition in CFX?

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 January 14, 2012, 14:11 Fan boundary condition in CFX? #1 New Member   Amit Agasty Join Date: Oct 2011 Location: CLZ, Deutschland Posts: 15 Rep Power: 7 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

 January 14, 2012, 20:02 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,808 Rep Power: 107 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 New Member   neha sharma Join Date: Oct 2016 Posts: 6 Rep Power: 2 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 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,808 Rep Power: 107 Have you googled fan curve?

 November 30, 2016, 14:31 #5 New Member   neha sharma Join Date: Oct 2016 Posts: 6 Rep Power: 2 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 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,808 Rep Power: 107 Then you simply work out the components in the xyz axes. This is basic vectors.

December 1, 2016, 08:30
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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.

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