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Radiation boundary conditions

  • Radiation boundary conditions are stored inside 0.org directory together with other boundary conditions
  • Both radiation models need incident radiation 158 to be specified, where for every patch the Marshark’s boundary condition is used
     /*--------------------------------*- C++ -*----------------------------------*\
    | =========                 |                                                 |
    | \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
    |  \\    /   O peration     | Version:  dev                                   |
    |   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
    |    \\/     M anipulation  |                                                 |
    \*---------------------------------------------------------------------------*/
    FoamFile
    {
        version     3.0;
        format      ascii;
        class       volScalarField;
        object      G;
    }
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
    
    dimensions      [1 0 -3 0 0 0 0];
    
    internalField   uniform 0;
    
    boundaryField
    {
        ".*"
        {
            type            MarshakRadiation;
            emissivityMode  lookup;
            emissivity      uniform 1.0;
            value           uniform 0;
        }
    }
    
    // ************************************************************************* //
    
  • FvDOM additionally needs radiation intensity ray 159 in the given direction where all patches use grey-diffusive condition for radiation intensity
    /*--------------------------------*- C++ -*----------------------------------*\
    | =========                 |                                                 |
    | \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
    |  \\    /   O peration     | Version:  dev                                   |
    |   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
    |    \\/     M anipulation  |                                                 |
    \*---------------------------------------------------------------------------*/
    FoamFile
    {
        version     2.0;
        format      ascii;
        class       volScalarField;
        object      IDefault;
    }
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
    
    dimensions      [1 0 -3 0 0 0 0];
    
    internalField   uniform 0;
    
    boundaryField
    {
        ".*"
        {
            type            greyDiffusiveRadiation;
            emissivityMode  lookup;
            emissivity      uniform 1.0;
            value           uniform 0;
        }
    }
    
    // ************************************************************************* //
    
  • Radiation temperature is in both cases retrieved from the temperature boundary field 160 (given by the boundary condition)