viewFactor2LI.H

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2023-2024 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
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Class
    Foam::VF::viewFactor2LI
 
Description
    Computes view factors according to the double line integral (2LI) method.
 
Usage
    Minimal example in \c <constant>/viewFactorsDict:
    \verbatim
    // Optional entries
    alpha    <scalar>;
 
    // Inherited entries
    ...
    \endverbatim
 
    where the entries mean:
    \table
      Property    | Description                       | Type | Reqd | Deflt
      alpha       | Perturbation for common edges     | scalar | no | 0.21
    \endtable
 
    The inherited entries are elaborated in:
    - \link viewFactorModel.H \endlink
 
SourceFiles
    viewFactorModel.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_vf_viewFactor2LI_H
#define Foam_vf_viewFactor2LI_H
 
#include "viewFactorModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
namespace VF
{
 
/*---------------------------------------------------------------------------*\
                        Class viewFactor2LI Declaration
\*---------------------------------------------------------------------------*/
 
class viewFactor2LI
:
    public viewFactorModel
{
protected:
 
    // Protected Data
 
        //- Perturbation for common edges; default = 0.21
        const scalar alpha_;
 
 
    // Protected Member Functions
 
        //- Calculate view factor using the double-area integral
        static scalar calculateFij
        (
            const List<point>& lPoints,
            const List<point>& rPoints,
            const scalar alpha
        );
 
        //- Calculate
        virtual scalarListList 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;
 
 
public:
 
    //- Runtime type information
    TypeName("viewFactor2LI");
 
    //- Constructor
    viewFactor2LI(const fvMesh& mesh, const dictionary& dict);
 
    //- Destructor
    virtual ~viewFactor2LI() = default;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace VF
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //