internalField in boundaryField

yambanshee · April 23, 2019, 10:24

Good day,

I've been following the suggestions of others on these forums, however I'm often seeing a similar value given for different boundary conditions; that being the internalField.

As an example, the outlet boundary for omega (with reverse flow) has been suggested to use

Code:

outlet
{
    type            inletOutlet;
    inletValue      $internalField;
}

I understand how inletOutlet works, but what does this setup use as the inletValue? is it the internal cell adjacent to the boundary? is it some averaged value across the whole domain? Is it something else?

I've tried looking through source code, but I'm not even sure where to look for the definition of this variable.

alexeym · April 23, 2019, 16:16

Hi,

It is a value of internalField of the field. See https://github.com/OpenFOAM/OpenFOAM...iveEntry.C#L42.

In fact if you make a variable with

"var 10;"

further use as "$var" is expanded to 10.

Since usually value of the boundary conditions is recalculated on the following iterations, value entry is used as a placeholder (you have to put it there due to code architecture). So, writing "$internalField" allows to avoid "repeating yourself" (value entry of the boundary condition will be updated as you update internalField).

April 23, 2019, 10:24	internalField in boundaryField	#1
yambanshee Senior Member Zander Meiring Join Date: Jul 2018 Posts: 125 Rep Power: 8	Good day, I've been following the suggestions of others on these forums, however I'm often seeing a similar value given for different boundary conditions; that being the internalField. As an example, the outlet boundary for omega (with reverse flow) has been suggested to use Code: outlet { type inletOutlet; inletValue $internalField; } I understand how inletOutlet works, but what does this setup use as the inletValue? is it the internal cell adjacent to the boundary? is it some averaged value across the whole domain? Is it something else? I've tried looking through source code, but I'm not even sure where to look for the definition of this variable.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
reactingMultiphaseEulerFoam	tonnykz	OpenFOAM Running, Solving & CFD	2	June 15, 2020 02:09
error in fireFoam, when running the case wallFireSpread2D	zhoubiao1088	OpenFOAM Running, Solving & CFD	9	February 1, 2018 18:45
Create internalfield from boundaryfield	Dharoc	OpenFOAM Programming & Development	0	December 17, 2017 11:17
Difference between 'internalField' and 'boundaryField'?	Rusty Velo	OpenFOAM	21	September 20, 2016 06:29
boundaryField vs. internalField	sebonator	OpenFOAM	10	January 24, 2011 16:43

April 23, 2019, 16:16		#2
alexeym Senior Member Alexey Matveichev Join Date: Aug 2011 Location: Nancy, France Posts: 1,938 Rep Power: 39	Hi, It is a value of internalField of the field. See https://github.com/OpenFOAM/OpenFOAM...iveEntry.C#L42. In fact if you make a variable with "var 10;" further use as "$var" is expanded to 10. Since usually value of the boundary conditions is recalculated on the following iterations, value entry is used as a placeholder (you have to put it there due to code architecture). So, writing "$internalField" allows to avoid "repeating yourself" (value entry of the boundary condition will be updated as you update internalField).