# How to set outflow boundary condition in openfoam

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 March 10, 2014, 10:12 How to set outflow boundary condition in openfoam #1 New Member   Jinbin Ge Join Date: Mar 2013 Posts: 6 Rep Power: 4 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

 March 10, 2014, 16:34 #2 Member   Julian Langowski Join Date: May 2011 Location: Bremen, Germany Posts: 91 Rep Power: 6 For simple outflow try Code: `zeroGradient.` For further information check tutorials/incompressible/simpleFoam/motorBike/0.org Best regards Julian __________________ πάντα ῥεῖ - Heraclitus

 March 10, 2014, 16:56 #3 Senior Member     Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 727 Rep Power: 18 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

March 11, 2014, 07:51
#4
New Member

Jinbin Ge
Join Date: Mar 2013
Posts: 6
Rep Power: 4
Quote:
 Originally Posted by Ruli 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"?

March 11, 2014, 08:16
#5
Member

Julian Langowski
Join Date: May 2011
Location: Bremen, Germany
Posts: 91
Rep Power: 6
Quote:
 Originally Posted by gejiabin 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

 Tags boundary condition, openfoam, outflow

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