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-   -   Some problems on the boundary conditions (http://www.cfd-online.com/Forums/cfx/91746-some-problems-boundary-conditions.html)

aweizazuji August 21, 2011 21:40

Some problems on the boundary conditions
 
Hi all,
I have some questions about CFX boundary conditions.
1.Is there a kind of boundary that is similar to Farfield in fluent?
2.As can been seen in tutorial, it recommends opening or free slip wall as the outflow boundary condition, but recently i did a test on some cases, but it did not work well. So i want to ask if i miss someting.
3.Could you please give me some suggestions about tansition model?Like Professor Menter's theory or application?
Thanks&Best Regards
LL

aweizazuji September 5, 2011 22:56

help
 
Any help please?

ghorrocks September 6, 2011 19:02

1) No, but I am not completely familiar with Fluent's farfield boundary.
2) "opening or free slip wall as outflow BC" - how can you use a wall for an outflow boundary?
3) It is described in the documentation and references from it.

aweizazuji September 6, 2011 20:49

Thanks.
(1)Farfield boundary is like Riemann boundary conditions. I just if what BC in CFX can define this type.
(2)In this situation I use the no free slip wall as the side while my domain is rectangle with its back still as the outflow BC. Or i can change the no slip wall with the openning type. i just want to know how to set this.
(3) I have read some.
Thanks&Best regards.
LL

ghorrocks September 7, 2011 07:47

Do a search of the forum - there are some old posts on Riemann BCs.


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