[Kobi_Faust]

Hi all,

I'm having a problem with the coupling of different materials via mappedWall in between a solid and a liquid region.

If I look (in the postProcessing) at the heatfluxes of the coupled patches all the solid-to-solid transitions perfectly fit (power outflow of the one patch equals inflow of the other patch).
But ALL solid-to-water transitions don't. Thereby the heat-flux of the solid (to water) meets the estimated outflow, but the heat flux of the adjoining water area is around 40 % smaller.

Any ideas on this?

The model runs without any warnings and also all other results (pressure, velocity, etc.) are looking reasonable.

Details:

Solver: chtMultiRegionFoam

My model has several solid regions and a water region. Each region is meshed seperatly with an unstructured mesh. The connecting patches are coupled via the mappedWall boundary option:

The following code sections are not complete, but I think all necessery parts should be given. (Otherwise it would be too extensive).

Solid Region 1: constant/Meat_15/polyMesh/boundary

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  6
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

6
(
    Meat_15_phi_innen
    {
        type            mappedWall;
        sampleMode 		nearestPatchFaceAMI;
        sampleRegion    Cladding_innen;
        samplePatch     Cladding_innen_phi_aussen_to_Meat_15;
		offsetMode		uniform;
        offset          ( 0 0 0 );
        nFaces          17268;
        startFace       87464;
    }
...
)

Solid Region 2: constant/Cladding_innen/polyMesh/boundary

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  6
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

12
(
    Cladding_innen_phi_innen_to_Wasser
    {
        type            mappedWall;
        sampleMode 		nearestPatchFaceAMI;
        sampleRegion    Wasser;
        samplePatch     Wasser_innen_phi_innen;
		offsetMode		uniform;
        offset          ( 0 0 0 );
        nFaces          336126;
        startFace       1679966;
    }
    Cladding_innen_phi_aussen_to_Meat_15
    {
        type            mappedWall;
        sampleMode 		nearestPatchFaceAMI;
        sampleRegion    Meat_15;
        samplePatch     Meat_15_phi_innen;
		offsetMode		uniform;
        offset          ( 0 0 0 );
        nFaces          50154;
        startFace       2302500;
    }
...
)

Water Region: constant/Wasser/polyMesh/boundary

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  6
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

24
(
    Wasser_innen_phi_innen
    {
        type            mappedWall;
        sampleMode 		nearestPatchFaceAMI;
        sampleRegion    Cladding_innen;
        samplePatch     Cladding_innen_phi_innen_to_Wasser;
		offsetMode		uniform;
        offset          ( 0 0 0 );
        nFaces          575864;
        startFace       16477096;
    }
...
)

The termperature coupling is done with "compressible::turbulentTemperatureCoupledBaffleMi xed"

Solid Region 1: 0/Meat_15/T

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.0                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0/fuel1";
    object      T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [ 0 0 0 1 0 0 0 ];

internalField   uniform 310;

boundaryField
{
    Meat_15_phi_innen
    {
        type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           uniform 310;
        Tnbr            T;
        kappaMethod     solidThermo;
    }
...
}

Solid Region 2: 0/Cladding_innen/T

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.0                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0/fuel1";
    object      T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [ 0 0 0 1 0 0 0 ];

internalField   uniform 310;

boundaryField
{
    Cladding_innen_phi_innen_to_Wasser
	{
        type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           uniform 310;
        Tnbr            T;
        kappaMethod     solidThermo;
    }
    Cladding_innen_phi_aussen_to_Meat_15
	{
        type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           uniform 310;
        Tnbr            T;
        kappaMethod     solidThermo;
    }
...
}

Water Region: 0/Wasser/T

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.0                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0/coolant";
    object      T;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [ 0 0 0 1 0 0 0 ];

internalField   uniform 310.14;

boundaryField
{
	Wasser_innen_phi_aussen
	{
		type            compressible::turbulentTemperatureCoupledBaffleMixed;
        value           uniform 310;
        Tnbr            T;
        kappaMethod     fluidThermo;
	}
...
}

Thanks for any idea and solution!!

[julieng]

The is some other subject related to the unsatisfied energy balance, see
buoyantSimpleFoam energy balance error


Maybe someone more expert than me can help you... and me


Best regards