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fat bug February 19, 2008 11:42

CFX 2D ANALYSIS BOUNDARY CONDITION
 
I found out that the way to do 2d analysis in CFX is to make 1 layer extruded mesh. The documentation of CFX says we can use something like a 20 Portion of a axisymetrical model. My question is, when setting up boundary condition in this case, should I still do a inlet volume flow rate and divide the original number by 9 (according to the model size), or would I have to use the velocity as boundary condition.

Thanks!

Glenn Horrocks February 19, 2008 17:22

Re: CFX 2D ANALYSIS BOUNDARY CONDITION
 
Hi,

Don't use a 20 degree portion, use a portion less than 5 degrees, or 1 or 2 degrees if you want to be super-accurate.

Yes, you need to scale mass flows by the ratio of the inlet sector to the full real inlet area. For a 2 degree sector the scale factor is then 180.

Glenn Horrocks


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