faceContactSphere.C

/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | www.openfoam.com
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    Copyright (C) 2011 OpenFOAM Foundation
-------------------------------------------------------------------------------
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
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Description
    Return location of contact sphere on the face

\*---------------------------------------------------------------------------*/

#include "face.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

Foam::scalar Foam::face::contactSphereDiameter
(
    const point& p,
    const vector& n,
    const UList<point>& meshPoints
) const
{
    vector n1 = n/(Foam::mag(n) + SMALL);
    vector n2 = areaNormal(meshPoints);

    n2 /= Foam::mag(n2) + SMALL;

    return 2*((centre(meshPoints) - p) & n2)/((n1 & n2) - 1.0);
}


// ************************************************************************* //