CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

How to set outflow boundary condition in openfoam

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   March 10, 2014, 10:12
Talking How to set outflow boundary condition in openfoam
  #1
New Member
 
Jinbin Ge
Join Date: Mar 2013
Posts: 6
Rep Power: 4
gejiabin is on a distinguished road
There is an outflow boundary condition in fluent,then how to set the outflow boundary condition in openfoam?
The basic boundary condition is fixedValue,fixGradient,zeroGradient ,calulated..,other BCs derive from them,but I don't know which one is same as outflow boundary condition in fluent
gejiabin is offline   Reply With Quote

Old   March 10, 2014, 16:34
Default
  #2
Member
 
Julian Langowski
Join Date: May 2011
Location: Bremen, Germany
Posts: 91
Rep Power: 6
Ruli is on a distinguished road
For simple outflow try
Code:
zeroGradient.
For further information check

tutorials/incompressible/simpleFoam/motorBike/0.org

Best regards
Julian
__________________
πάντα ῥεῖ - Heraclitus
Ruli is offline   Reply With Quote

Old   March 10, 2014, 16:56
Default
  #3
Senior Member
 
mturcios777's Avatar
 
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 727
Rep Power: 18
mturcios777 will become famous soon enough
zeroGradient it a good suggestion. Since OpenFOAM is less "black box", it helps if you have a working knowledge of the theory of numerical simulation. Check the Wikipedia article for a decent overview:

http://en.wikipedia.org/wiki/Boundary_conditions_in_CFD
mturcios777 is offline   Reply With Quote

Old   March 11, 2014, 07:51
Default
  #4
New Member
 
Jinbin Ge
Join Date: Mar 2013
Posts: 6
Rep Power: 4
gejiabin is on a distinguished road
Quote:
Originally Posted by Ruli View Post
For simple outflow try
Code:
zeroGradient.
For further information check

tutorials/incompressible/simpleFoam/motorBike/0.org

Best regards
Julian
Hi,
in tutorials/incompressible/simpleFoam/motorBike/0.org,
https://github.com/martinep/foam-ext.../motorBike/0/U
U:
outlet
{
type inletOutlet;
inletValue uniform (0 0 0);
value $internalField;
}
https://github.com/martinep/foam-ext.../motorBike/0/p
p:
outlet
{
type fixedValue;
value $internalField;
}
inletOutlet may mean zeroGradient if fluid flows out,fixedvalue if fluid flows in, but I do not understand "value $internalField"?
gejiabin is offline   Reply With Quote

Old   March 11, 2014, 08:16
Default
  #5
Member
 
Julian Langowski
Join Date: May 2011
Location: Bremen, Germany
Posts: 91
Rep Power: 6
Ruli is on a distinguished road
Quote:
Originally Posted by gejiabin View Post
inletOutlet may mean zeroGradient if fluid flows out,fixedvalue if fluid flows in, but I do not understand "value $internalField"?
$internalField is the initial condition defined in the top of the file. The first iteration uses this value for starting.

Best regards
Julian
__________________
πάντα ῥεῖ - Heraclitus
Ruli is offline   Reply With Quote

Reply

Tags
boundary condition, openfoam, outflow

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Staggered grid outflow boundary condition avinash87 Main CFD Forum 0 November 4, 2013 06:43
can slip boundary condition in openFoam mean "inviscid wall" ? s.m OpenFOAM Pre-Processing 2 October 11, 2013 13:27
Question about heat transfer coefficient setting for CFX Anna Tian CFX 1 June 16, 2013 06:28
How to set boundary condition in Fluent for the fo Peiyong FLUENT 1 November 10, 2006 12:44
outflow boundary condition Guillaume Dulong FLUENT 1 September 13, 2004 05:12


All times are GMT -4. The time now is 14:03.