Fluent Boundary Condition for Opening

rippert42 · June 18, 2009, 10:21

Hello,

I'm working with fluent 12.0.16 (integrated in ANSYS 12.0). The problem is: I have a face which exists on the Connection between two volume bodies. This face becomes a "wall" automatically. I would like to change this BC into an opening, something that is no blocker for the fluid flow. "Outflow", "pressure outlet" or anything else cannot give me the right behavior.
Is there a BC in Fluent, that somehow removes a face, so it acts like an Opening between two interiors?

Thanks a lot!

Chris

laurentb · June 18, 2009, 10:49

try interior

rippert42 · June 18, 2009, 10:56

There is no BC called "interior". There are: axis, outflow, mass flow inlet, pressure far field, pressure inlet, pressure outlet, symmetrie, velocity inlet, wall, inlet vent, intake fan, outlet vent and exhaust fan.

-mAx- · June 19, 2009, 00:49

Where comes your mesh from? (gambit?)

laurentb · June 19, 2009, 02:05

if not you may have a problem with the mesh or the geometry

rippert42 · June 19, 2009, 02:29

Well it must be that. I used Gambit before, but I have problems when connecting to the license server for Gambit. So I'm using ANSYS 12.0 WB MESHING or CFX-MESH now. In those progs, you have no direct access to the mesh. Or, may be, I just can't figure out how.
Thanx a lot!

rippert42 · June 19, 2009, 02:32

hmm, I can chosse interior for interior bodies, but not for the outer faces of a body. I have to find a way to remove those I guess.

-mAx- · June 19, 2009, 05:36

Which name is given to this wall-BC?
If you have generated your mesh with Gambit, the surface between 2 CONNECTED volumes shoud be set as interior (and not visible as BC).
Now if you see this surface in the BC, it means:
1- you have choosed this surface as BC (wall)
2- the volumes are not connected, but you should have 2 superposed surface, and consequently 2 wall-BC
So I would check if your volumes are connected, and/or if the surface isn't set a BC.

Paola · November 9, 2011, 06:13

Hi, I have this exact same problem.
I think my 2 solid are not connected, so I have 2 wall conditions, one for each volume.
I generated the model with Gambit, can I solve it from Fluent?

Thanks!

-mAx- · November 9, 2011, 06:48

Quote:

Originally Posted by Paola

Hi, I have this exact same problem.
I think my 2 solid are not connected, so I have 2 wall conditions, one for each volume.
I generated the model with Gambit, can I solve it from Fluent?

Thanks!

I don't think so
Go back to Gambit

laurentb · November 9, 2011, 08:30

Have a look to the command mesh/fuse... it could help you :
The Fuse Face Zones dialog box allows you to fuse boundaries (i.e., remove duplicate nodes and faces and delete artificial internal boundaries) created by assembling multiple mesh regions.

swetkyz · November 9, 2011, 12:06

Please see the following post: http://www.cfd-online.com/Forums/flu...tml#post331186

Hopefully the same still applies to ANSYS 12.

June 18, 2009, 10:21	Fluent Boundary Condition for Opening	#1
rippert42 New Member Chris Schladoer Join Date: Mar 2009 Posts: 5 Rep Power: 17	Hello, I'm working with fluent 12.0.16 (integrated in ANSYS 12.0). The problem is: I have a face which exists on the Connection between two volume bodies. This face becomes a "wall" automatically. I would like to change this BC into an opening, something that is no blocker for the fluid flow. "Outflow", "pressure outlet" or anything else cannot give me the right behavior. Is there a BC in Fluent, that somehow removes a face, so it acts like an Opening between two interiors? Thanks a lot! Chris

June 19, 2009, 00:49		#4
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	Where comes your mesh from? (gambit?) __________________ In memory of my friend Hervé: CFD engineer & freerider

June 19, 2009, 05:36		#8
-mAx- Super Moderator Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,297 Rep Power: 41	Which name is given to this wall-BC? If you have generated your mesh with Gambit, the surface between 2 CONNECTED volumes shoud be set as interior (and not visible as BC). Now if you see this surface in the BC, it means: 1- you have choosed this surface as BC (wall) 2- the volumes are not connected, but you should have 2 superposed surface, and consequently 2 wall-BC So I would check if your volumes are connected, and/or if the surface isn't set a BC. __________________ In memory of my friend Hervé: CFD engineer & freerider

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
UDS problem with wall boundary condition	Alex F.	FLUENT	15	September 21, 2015 09:28
inlet velocity boundary condition	murali	CFX	5	August 3, 2012 08:56
fluent Boundary condition of supersonic flat plate	Mechal	FLUENT	0	December 16, 2005 16:07
Spectral Method Boundary condition	Deepak	Main CFD Forum	1	February 25, 2004 09:48
FLUENT Boundary condition problem	Khalid	Main CFD Forum	1	December 2, 1998 19:54

June 18, 2009, 10:49		#2
laurentb Member Laurent B Join Date: Jun 2009 Location: Lille, FRANCE Posts: 70 Rep Power: 16	try interior

June 18, 2009, 10:56		#3
rippert42 New Member Chris Schladoer Join Date: Mar 2009 Posts: 5 Rep Power: 17	There is no BC called "interior". There are: axis, outflow, mass flow inlet, pressure far field, pressure inlet, pressure outlet, symmetrie, velocity inlet, wall, inlet vent, intake fan, outlet vent and exhaust fan.

June 19, 2009, 02:29		#6
rippert42 New Member Chris Schladoer Join Date: Mar 2009 Posts: 5 Rep Power: 17	Well it must be that. I used Gambit before, but I have problems when connecting to the license server for Gambit. So I'm using ANSYS 12.0 WB MESHING or CFX-MESH now. In those progs, you have no direct access to the mesh. Or, may be, I just can't figure out how. Thanx a lot!

June 19, 2009, 02:32		#7
rippert42 New Member Chris Schladoer Join Date: Mar 2009 Posts: 5 Rep Power: 17	hmm, I can chosse interior for interior bodies, but not for the outer faces of a body. I have to find a way to remove those I guess.

November 9, 2011, 06:13		#9
Paola New Member Paola Alpresa Gutiérrez Join Date: Sep 2011 Posts: 10 Rep Power: 14	Hi, I have this exact same problem. I think my 2 solid are not connected, so I have 2 wall conditions, one for each volume. I generated the model with Gambit, can I solve it from Fluent? Thanks!

November 9, 2011, 08:30		#11
laurentb Member Laurent B Join Date: Jun 2009 Location: Lille, FRANCE Posts: 70 Rep Power: 16	Have a look to the command mesh/fuse... it could help you : The Fuse Face Zones dialog box allows you to fuse boundaries (i.e., remove duplicate nodes and faces and delete artificial internal boundaries) created by assembling multiple mesh regions.

November 9, 2011, 12:06		#12
swetkyz Member Zachariah Swetky Join Date: Aug 2011 Posts: 36 Rep Power: 14	Please see the following post: http://www.cfd-online.com/Forums/flu...tml#post331186 Hopefully the same still applies to ANSYS 12.