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December 19, 2013, 20:57 |
Modelling Impulse Fans
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#1 |
New Member
Michael Smith
Join Date: Dec 2013
Location: Canberra, Australia
Posts: 17
Rep Power: 12 |
Hi all,
I've been trying for a while to model an impulse fan correctly. If I specify the suction side of the fan as an exhaust and the supply side as an inlet, I get pretty good flow patterns, however the air properties (such as age of air) are not preserved. How do I link the two boundaries to preserve conditions? |
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December 20, 2013, 05:12 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,844
Rep Power: 144 |
Use a momentum source rather than an inlet/outlet pair. If you want to be tricky you can also define it to have the fan performance curve.
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January 5, 2014, 19:07 |
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#3 |
New Member
Michael Smith
Join Date: Dec 2013
Location: Canberra, Australia
Posts: 17
Rep Power: 12 |
Hi Glenn,
Thanks for the reply. I have tried that, but it doesn't seem to want to converge (and the results look pretty off). Are there other specific settings that I should be focusing on to assist? Cheers, Mike |
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January 5, 2014, 19:08 |
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#4 |
New Member
Michael Smith
Join Date: Dec 2013
Location: Canberra, Australia
Posts: 17
Rep Power: 12 |
Also, I think the use of a momentum source requires specific geometry setup, ie, there isn't two separate bodies/domains, but one domain and a subdomain, or something...? I'm not 100% across how to set it up
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January 12, 2014, 07:13 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,844
Rep Power: 144 |
A momentum source is the normal way to do this. If it is not working for you then you have not set it up correctly.
I do not understand you comment "two separate bodies/domains". You just define the fan region as a subdomain with the source applied to it. |
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January 13, 2014, 18:09 |
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#6 |
Senior Member
Edmund Singer P.E.
Join Date: Aug 2010
Location: Minneapolis, MN
Posts: 511
Rep Power: 21 |
Are you setting your age of air at the "outlet of the fan" equal to the age of air at "inlet of fan"?
Of course, using a momentum source will not require this. But if you kept it as a inlet/outlet pair, you will need to do this in order to maintain the correct age. |
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January 29, 2014, 18:49 |
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#7 |
New Member
Michael Smith
Join Date: Dec 2013
Location: Canberra, Australia
Posts: 17
Rep Power: 12 |
I'm not sure how to do that sorry, re setting the outlet value equal to the inlet value. Quick research suggested it needed some coding that was more complex than my experience could deal with
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January 29, 2014, 18:49 |
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#8 |
New Member
Michael Smith
Join Date: Dec 2013
Location: Canberra, Australia
Posts: 17
Rep Power: 12 |
Ah, the issue was that in SpaceClaim you can't seem to set multi-body parts by creating a new part as you can in DesignModeller for compatable meshing...
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Tags |
age of air, cfx, impulse |
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