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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
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
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
(given by the boundary condition)