viewFactor2AI.C

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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    Copyright (C) 2023-2024 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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#include "viewFactor2AI.H"
#include "mathematicalConstants.H"
#include "addToRunTimeSelectionTable.H"
 
using namespace Foam::constant;
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
namespace VF
{
    defineTypeNameAndDebug(viewFactor2AI, 0);
    addToRunTimeSelectionTable(viewFactorModel, viewFactor2AI, mesh);
}
}
 
// * * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * //
 
Foam::scalar Foam::VF::viewFactor2AI::calculateFij
(
    const point& xi,
    const point& xj,
    const vector& dAi,
    const vector& dAj
)
{
    const vector r(xj - xi);
    const scalar rMag = mag(r);
    const scalar dAiMag(mag(dAi));
    const scalar dAjMag(mag(dAj));
 
    if (rMag > SMALL && dAiMag > SMALL && dAjMag > SMALL)
    {
        const vector nr(r/rMag);
        const vector ni(dAi/dAiMag);
        const vector nj(dAj/dAjMag);
 
        const scalar Fij =
            -(nr & ni)*(nr & nj)/sqr(rMag)*dAjMag*dAiMag/mathematical::pi;
 
        if (Fij > 0) return Fij;
    }
 
    return 0;
}
 
 
Foam::scalarListList Foam::VF::viewFactor2AI::calculate
(
    const labelListList& visibleFaceFaces,
    const pointField& compactCf,
    const vectorField& compactSf,
    const UList<List<vector>>& compactFineSf,
    const UList<List<point>>& compactFineCf,
    const UList<List<point>>& compactPoints,
    const UList<label>& compactPatchId
) const
{
    // Fill local view factor matrix
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    scalarListList Fij(visibleFaceFaces.size());
 
    forAll(visibleFaceFaces, facei)
    {
        if (debug > 1)
        {
            Pout<< "facei:" << facei << "/" << visibleFaceFaces.size()
                << endl;
        }
 
        const labelList& visibleFaces = visibleFaceFaces[facei];
 
        Fij[facei].resize(visibleFaces.size(), Zero);
 
        const point& dCi = compactCf[facei];
        const vector& Ai = compactSf[facei];
        const scalar magAi = mag(Ai);
 
        if (magAi < SMALL) continue;
 
        forAll(visibleFaces, visibleFacei)
        {
            const label sloti = visibleFaces[visibleFacei];
            const point& dCj = compactCf[sloti];
            const vector& Aj = compactSf[sloti];
 
            const scalar Fij2AI = calculateFij(dCi, dCj, Ai, Aj);
 
            Fij[facei][visibleFacei] = Fij2AI/magAi;
        }
    }
 
 
    return Fij;
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::VF::viewFactor2AI::viewFactor2AI
(
    const fvMesh& mesh,
    const dictionary& dict
)
:
    viewFactorModel(mesh, dict)
{}
 
 
// ************************************************************************* //