[Hr_kules]

Hey guys, for a multi region simulation i want to couple two (then three) seperate generated meshes. I am somewhat familiar with merging meshes, but i am unsure considering the interfaces.
For the first test i want to couple a solid and a fluid thermaly along a surface with the exact same geometric values. (same length and width and same geometric features).
After meshing both of them, with same refinement levels in for each snappyhex run, i am sitting on two times the surface, but with different amount of faces:
solid:

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  9
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

3
(
    lowerInterface
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          1972883;
        startFace       23702955;
    }
    upperInterface
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          1976846;
        startFace       25675838;
    }
    wallplate
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          69265;
        startFace       27652684;
    }
)

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

fluid:

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  9
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

4
(
    Inlethot
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          10254;
        startFace       19818519;
    }
    Outlethot
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          10242;
        startFace       19828773;
    }
    wallfluidhot
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          1156425;
        startFace       19839015;
    }
    upperInterface
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          1642604;
        startFace       20995440;
    }
)

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

My question is now how to couple the boundary upperInterface thermaly so that i can use the boundary condition of following type:

    fluid_to_plate 
    {
        type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           $internalField;
        Tnbr            T;
    }

Generally i'd have no problem with changing the patches with a createPatchDict to mapped walls, however i am uncertain if that would lead to accurate solutions. I have no idea wether a mapped wall uses any kind of interpolation between the patches and wether chtMultiRegionFoam accepts non conforming interfaces, so I need an idea how to prepare the patches to get a nice simulation.



Any help is greatly appreciated!



Kind regards!