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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2018 OpenFOAM Foundation
\\/ 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/>.
\*---------------------------------------------------------------------------*/
#include "cellModel.H"
#include "pyramid.H"
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
Foam::vector Foam::cellModel::centre
(
const labelList& pointLabels,
const pointField& points
) const
{
// Estimate centre of cell
vector cEst = Zero;
// Sum the points indicated by the label list
forAll(pointLabels, i)
{
cEst += points[pointLabels[i]];
}
// Average by dividing by the number summed over.
cEst /= scalar(pointLabels.size());
// Calculate the centre by breaking the cell into pyramids and
// volume-weighted averaging their centres
scalar sumV = 0.0;
vector sumVc = Zero;
const faceList cellFaces = faces(pointLabels);
forAll(cellFaces, i)
{
const face& curFace = cellFaces[i];
scalar pyrVol =
pyramid<point, const point&, const face&>
(
curFace,
cEst
).mag(points);
if (pyrVol > small)
{
WarningInFunction
<< "zero or negative pyramid volume: " << -pyrVol
<< " for face " << i
<< endl;
}
sumVc -=
pyrVol
*pyramid<point, const point&, const face&>(curFace, cEst)
.centre(points);
sumV -= pyrVol;
}
return sumVc/(sumV + vSmall);
}
Foam::scalar Foam::cellModel::mag
(
const labelList& pointLabels,
const pointField& points
) const
{
// Estimate centre of cell
vector cEst = Zero;
// Sum the points indicated by the label list
forAll(pointLabels, i)
{
cEst += points[pointLabels[i]];
}
// Average by dividing by the number summed over.
cEst /= scalar(pointLabels.size());
// Calculate the magnitude by summing the -mags of the pyramids
// The sign change is because the faces point outwards
// and a pyramid is constructed from an inward pointing face
// and the base centre-apex vector
scalar v = 0;
const faceList cellFaces = faces(pointLabels);
forAll(cellFaces, i)
{
const face& curFace =cellFaces[i];
scalar pyrVol =
pyramid<point, const point&, const face&>
(
curFace,
cEst
).mag(points);
if (pyrVol > small)
{
WarningInFunction
<< "zero or negative pyramid volume: " << -pyrVol
<< " for face " << i
<< endl;
}
v -= pyrVol;
}
return v;
}
// ************************************************************************* //
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