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-   -   how to calculate mass flow at pressure boundary (http://www.cfd-online.com/Forums/fluent/46216-how-calculate-mass-flow-pressure-boundary.html)

Hugo October 3, 2007 09:35

how to calculate mass flow at pressure boundary
 
Hi Users!

How does Fluent calculate mass flow at pressure boundaries? The user's guide says

m'=sum(density * dot(velocity, area))

but when I try that I get a completely different answer. I've exported node coorinates to calculate area, and cell values of axial and radial velocity, and calulated in excel.

There is a problem the Fluent reports non-zero velocity at the nodes on the walls - could this be related?

Thanks for any clues? Hugo.

Jones October 8, 2007 06:19

Re: how to calculate mass flow at pressure boundar
 
if you using 2D analysis, first make reference value


Hugo October 11, 2007 15:22

Re: how to calculate mass flow at pressure boundar
 
Hi Jones,

Please could yu repost that, as it got cut off. thanks, hugo.


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