[Woud]

I am working on a simpleFoam case where i want to connect multiple T-junctions ending with a 90 degree elbow.

To be able to extend the amount of T-junctions without having to remesh every time a make use of mergeMeshes and stitchMesh.
For connecting the T-junctions the stitchMesh works fine if i use a stitchMeshToleranceDict oterwise i get residual faces which are a problem i suppose.

However, when i want to connect the elbow which has the same inner diameter as the T-Juntion (and therefore the same mesh domain at that point). I am stuck with 46 and 15 faces for the two patches i stitched together.

I tried using stitchMesh -perfect, stitchMesh -integral, stitchMesh -partial but there is no difference in the result.

So, I think there are two solutions:
- Remove the residual patches and assign them to the internal mesh.
- Change the stitchMesh procedure so there are no residual faces.

I attached two images to show the problem and the stitchMeshToleranceDict. The whole case is quite big, so i hope this is enough information, otherwise feel free to ask.

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  1.4                                   |
|   \\  /    A nd           | Web:      http://www.openfoam.org               |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/

FoamFile
{
    version         2.0;
    format          ascii;

    root            "";
    case            "";
    instance        "";
    local           "";

    class           dictionary;
    object          stitchMeshToleranceDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

//- Point merge tolerance
pointMergeTol 0.3;

//- Edge merge tolerance
edgeMergeTol 0.05;

//- Integral match point adjustment tolerance
integralAdjTol 0.15;

//- Edge intersection master catch fraction
edgeMasterCatchFraction 0.4;

//- Edge end cut-off tolerance
edgeEndCutoffTol 0.0001;

//- Edge intersection co-planar tolerance
edgeCoPlanarTol 0.8;