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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2020-2022 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 "MPLICface.H"
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
Foam::scalar Foam::MPLICface::alphaPhiU() const
{
if (flipped_)
{
return -alphaPhiU(subPointsU_, subPoints_);
}
else
{
return alphaPhiU(subPointsU_, subPoints_);
}
}
template<class VectorList, class PointList>
inline Foam::scalar Foam::MPLICface::alphaPhiU
(
const VectorList& pointsU,
const PointList& points
) const
{
const point& baseP = points[0];
const vector& baseU = pointsU[0];
scalar alphaPhiU = 0;
for(label i=1; i < points.size()-1; ++i)
{
// 1/2 Triangle area
const vector area = (points[i] - baseP) ^ (points[i + 1] - baseP);
// Calculate face area weighted velocity field
// Average is missing 1/3 and area 1/2
alphaPhiU += (baseU + pointsU[i] + pointsU[i + 1]) & area;
}
alphaPhiU /= 6.0;
return alphaPhiU;
}
template<class VectorList, class PointList>
inline Foam::scalar Foam::MPLICface::alphaPhiU
(
const VectorList& pointsU,
const PointList& points,
const labelList& f
) const
{
const point& baseP = points[f[0]];
const vector& baseU = pointsU[f[0]];
scalar alphaPhiU = 0;
for(label i=1; i < f.size()-1; ++i)
{
// 1/2 Triangle area
const vector area = (points[f[i]] - baseP) ^ (points[f[i + 1]] - baseP);
// Calculate face area weighted velocity field
// Average is missing 1/3 and area 1/2
alphaPhiU += (baseU + pointsU[f[i]] + pointsU[f[i + 1]]) & area;
}
alphaPhiU /= 6.0;
return alphaPhiU;
}
inline const Foam::DynamicList<Foam::point>& Foam::MPLICface::cutPoints() const
{
return cutPoints_;
}
inline const Foam::DynamicList<Foam::point>&
Foam::MPLICface::subPoints() const
{
return subPoints_;
}
inline const Foam::DynamicList<Foam::label>& Foam::MPLICface::cutEdges() const
{
return cutEdges_;
}
inline const Foam::vector Foam::MPLICface::Sf() const
{
return face::area(subPoints_);
}
inline const Foam::vector Foam::MPLICface::Cf
(
const vector& area
) const
{
// If the face is a triangle, do a direct calculation
if (subPoints_.size() == 3)
{
return (1.0/3.0)*(subPoints_[0] + subPoints_[1] + subPoints_[2]);
}
// For more complex faces, decompose into triangles ...
// Compute an estimate of the centre as the average of the points
point pAvg = Zero;
forAll(subPoints_, pi)
{
pAvg += subPoints_[pi];
}
pAvg /= subPoints_.size();
const vector sumAHat = normalised(area);
// Compute the area-weighted sum of the triangle centres. Note use
// the triangle area projected in the direction of the face normal
// as the weight, *not* the triangle area magnitude. Only the
// former makes the calculation independent of the initial estimate.
scalar sumAn = 0;
vector sumAnc = Zero;
forAll(subPoints_, pi)
{
const point& p = subPoints_[pi];
const point& pNext = subPoints_[subPoints_.fcIndex(pi)];
const vector a = (pNext - p)^(pAvg - p);
const vector c = p + pNext + pAvg;
const scalar an = a & sumAHat;
sumAn += an;
sumAnc += an*c;
}
// Complete calculating centres and areas. If the face is too small
// for the sums to be reliably divided then just set the centre to
// the initial estimate.
if (sumAn > vSmall)
{
return (1.0/3.0)*sumAnc/sumAn;
}
else
{
return pAvg;
}
}
// ************************************************************************* //
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