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Old   January 23, 2014, 04:26
Default cfd analysis of fan
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KATESHIA JYOTIN ASHOK
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I am working with cfd analysis as my project work.In my project i have to analysis of FAN placed inside a close room,No inlet condition inside room and fan is rotating at 2000 RPM.which type of boundary condition should i use?
should i write UDF ? can it be done with the use of dynamic mesh ?
please kindly help me..
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Old   January 23, 2014, 05:06
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First of all, you should make up your mind about what you want to simulate.

If it is the flow through the fan itself with all the details of its geometry, then at least a sliding mesh is needed.

If it is the air flow inside the room caused by the fan, then there are simpler simulation approaches that dont require modeling the fan with all the difficulties that come with it.
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Old   January 23, 2014, 07:56
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I have to do analysis of air flow inside the room caused by fan..Then which type of boundary condition should i use ?
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Old   January 23, 2014, 08:52
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Fluent has a fan boundary condition for this specific purpose. The manual has all the information you need about it, including an example of how to use it.
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Old   January 23, 2014, 11:16
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In fan boundary condition how to calculate pressure jump?
and how swirl velocity specification should given ?
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Old   January 23, 2014, 11:44
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That depends on the fan you are using.

For the pressure difference, the manufacturer should have a chart "pressure jump versus flow rate" just like this one on the last page:
http://img.ebmpapst.com/products/dat...3212JH-GER.pdf

Concerning the swirl component, I would leave it zero as long as you dont have any specific information.
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Old   January 24, 2014, 07:58
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Thank you..for the help..but how can i cfd analysis of air flow inside the room caused by fan along with rotating fan in animation.
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Old   January 24, 2014, 08:18
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If you absolutely need the rotating fan to show-off, you will have to model it.
You might aswell do some advanced post-processing to add a rotating fan to the simulation results, but I have no idea how to do that and personally dont like such kind of "blending".

Be aware that most probably, the time scales of the flow inside the room will be several orders of magnitude slower than the time scales of the fan rotating at 2000rpm.
Such a simulation would take a tremendous amount of time, while the benefit of simulating the "real" fan will be quite small.
In fact, the results might even be worse because of the additional difficulties involved in such a simulation.
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Old   January 24, 2014, 13:15
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can the analysis done by fan boundary condition ? if i want animate rotating fan at 2000rpm ?

Last edited by jyotinkateshia; January 26, 2014 at 09:20.
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