How to get face ID for labelToFace

qingqingliu · March 28, 2023, 14:15

I want to create a baffle on an internal face using createBafflesDict. To do this, I need to set this internal face as a boundary using topoSet. In topoSet, I want to use labelToFace to define the internal face as follows:

actions
(

{
name baffleFace;
type faceSet;
action new;
source labelToFace;
value (???);

}

);

In value, I need to input the face ID. Does anyone know how to get the face ID of an internal face?

crubio.abujas · September 19, 2025, 09:34

You may use paraview for identify the faces. Just extract the patch where you want to identify some IDs and then select then, rather by manual selection or spreadsheet view.

Just be aware that the ID used by paraview starts by 0, where OpenFOAM have another starting point. You can check the starting point of the patch in constant/polyMesh/boundary. Now you just have to add the startFace to the ID obtained by Paraview and use them in topoSet.

March 28, 2023, 14:15	How to get face ID for labelToFace	#1
qingqingliu Member Ching Liu Join Date: Sep 2017 Posts: 52 Rep Power: 10	I want to create a baffle on an internal face using createBafflesDict. To do this, I need to set this internal face as a boundary using topoSet. In topoSet, I want to use labelToFace to define the internal face as follows: actions ( { name baffleFace; type faceSet; action new; source labelToFace; value (???); } ); In value, I need to input the face ID. Does anyone know how to get the face ID of an internal face?

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September 19, 2025, 09:34		#2
crubio.abujas Senior Member Carlos Rubio Abujas Join Date: Jan 2018 Location: Spain Posts: 131 Rep Power: 12	You may use paraview for identify the faces. Just extract the patch where you want to identify some IDs and then select then, rather by manual selection or spreadsheet view. Just be aware that the ID used by paraview starts by 0, where OpenFOAM have another starting point. You can check the starting point of the patch in constant/polyMesh/boundary. Now you just have to add the startFace to the ID obtained by Paraview and use them in topoSet.