/usr/include/freefoam/finiteVolume/NVDVTVDV.H is in libfreefoam-dev 0.1.0+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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.
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
Class
    Foam::NVDVTVDV
Description
    Foam::NVDVTVDV
\*---------------------------------------------------------------------------*/
#ifndef NVDVTVDV_H
#define NVDVTVDV_H
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
/*---------------------------------------------------------------------------*\
                           Class LimitedScheme Declaration
\*---------------------------------------------------------------------------*/
class NVDVTVDV
{
public:
    typedef vector phiType;
    typedef tensor gradPhiType;
    // Null Constructor
        NVDVTVDV()
        {}
    // Member Functions
        scalar phict
        (
            const scalar faceFlux,
            const vector& phiP,
            const vector& phiN,
            const tensor& gradcP,
            const tensor& gradcN,
            const vector& d
        ) const
        {
            vector gradfV = phiN - phiP;
            scalar gradf = gradfV & gradfV;
            scalar gradcf;
            if (faceFlux > 0)
            {
                gradcf = gradfV & (d & gradcP);
            }
            else
            {
                gradcf = gradfV & (d & gradcN);
            }
            // Stabilise for division
            gradcf = stabilise(gradcf, VSMALL);
            
            return 1 - 0.5*gradf/gradcf;
        }
        scalar r
        (
            const scalar faceFlux,
            const vector& phiP,
            const vector& phiN,
            const tensor& gradcP,
            const tensor& gradcN,
            const vector& d
        ) const
        {
            vector gradfV = phiN - phiP;
            scalar gradf = gradfV & gradfV;
            scalar gradcf;
            if (faceFlux > 0)
            {
                gradcf = gradfV & (d & gradcP);
            }
            else
            {
                gradcf = gradfV & (d & gradcN);
            }
            // Stabilise for division
            gradf = stabilise(gradf, VSMALL);
            return 2*(gradcf/gradf) - 1;
        }
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************ vim: set sw=4 sts=4 et: ************************ //
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