Some problems on the boundary conditions

aweizazuji · August 21, 2011, 22:40

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, 23:56

Any help please?

ghorrocks · September 6, 2011, 20:02

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, 21:49

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, 08:47

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

August 21, 2011, 22:40	Some problems on the boundary conditions	#1
aweizazuji New Member LL Join Date: Jun 2011 Posts: 17 Rep Power: 15	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

September 5, 2011, 23:56	help	#2
aweizazuji New Member LL Join Date: Jun 2011 Posts: 17 Rep Power: 15	Any help please?

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September 6, 2011, 20:02		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	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.

September 6, 2011, 21:49		#4
aweizazuji New Member LL Join Date: Jun 2011 Posts: 17 Rep Power: 15	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

September 7, 2011, 08:47		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Do a search of the forum - there are some old posts on Riemann BCs.