[stempellek]

Dear Foamers,
I'm new to this topic and I have big problem with define boundary in my model. I generated my mesh in Ansys and then I loaded it to OpenFoam using fluent3DMeshToFoam. Now I would like to define boundary faces using topoSet but I have problem with that. In photo I checked inlet in box wchich I wants to get. Could someone here help me ?

https://imgur.com/a/dMTrSWZ

Link to files
https://drive.google.com/drive/folde...DA?usp=sharing



I created a faceSet:

actions
(
  {
          name    inlet1;
          type    faceSet;
          action    new;
          source    boxToFace;
          sourceInfo
    {
           box (0.015 0.005 0.02)(0.05 0.02 0.021);
    }
  }

);

and now I want to convert this to patch usuing createPatch:

 patches
(

 {
   name    inlet;
   patchInfo
    {
       type patch;
    }
   constructFrom set;
   set inlet1;
 }
);

But I get this error:

--> FOAM FATAL ERROR: 
Face 21655 specified in set inlet1 is not an external face of the mesh.
 This application can only repatch existing boundary faces.

[clapointe]

You get the error because a patch must be on the boundary of the mesh. Evidently the face set includes an internal face. You have a few options : you can tweak your bounds to make sure that only external/boundary faces are selected, or you can take a subset of the first set with boundaryFaces, like this :

{
    name inlet1;
    type faceSet;
    action subset;
    source boundaryToFace;
    sourceInfo
    {
    }
}