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-   -   bigger or smaller enclosure box (http://www.cfd-online.com/Forums/cfx/93333-bigger-smaller-enclosure-box.html)

syafiq October 12, 2011 04:56

bigger or smaller enclosure box
 
hi,
im doing analysis on a blunt body.
which one is better, using bigger or smaller enclosure box? and why?

any opinion?

cheers

ghorrocks October 12, 2011 06:43

If you want to model the body moving through the open atmosphere then a big enclosure box (because it reduces proximity effects). If you want to model the body in an enclosed space like a wind tunnel then model the wind tunnel as the enclosure.

syafiq October 13, 2011 04:46

do size of enclosure box will affected the results?
why is that?

ghorrocks October 13, 2011 05:08

Yes it does. It is one of the basic checks you need to do for far-field simulations. When your boundaries are too close it will cause an error in the simulation by artificially constraining the flow.


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