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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2020-2026 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/>.
Class
Foam::MPLICcell
Description
Class performs geometric matching of volume fraction and calculates surface
interpolation of volume fraction field.
Cut algorithms:
- Single cell cut
- Face-edge walk multiple cell cuts
- Tet decomposition cell cuts
SourceFiles
MPLICcell.C
\*---------------------------------------------------------------------------*/
#ifndef MPLICcell_H
#define MPLICcell_H
#include "MPLICface.H"
#include "MPLICcellStorage.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
/*---------------------------------------------------------------------------*\
Class MPLICcell Declaration
\*---------------------------------------------------------------------------*/
class MPLICcell
{
// Private Data
// Face related objects
//- Select unweighted interpolation if true
// velocity flux corrected if false
const bool unweighted_;
//- Select multi-cut if true or single-cut if false
const bool multiCut_;
//- Surface interpolated alpha
DynamicList<scalar> alphaf_;
//- Flux of alpha from point interpolated U
DynamicList<scalar> alphaPhiU_;
//- Face flux from point interpolated U
DynamicList<scalar> phiU_;
// Geometry related objects
//- Calculated volume fraction corresponding to the cut
scalar cutAlpha_;
//- Cut surface area vector
vector cutSf_;
//- Cut normal
vector cutNormal_;
//- Face cutter
MPLICface faceCutter_;
//- Sub cell volume
scalar subCellVolume_;
//- Cut points for single cut
DynamicList<point> cutPoints_;
//- Cut edge labels for single cut
DynamicList<label> cutEdges_;
//- Submerged face areas
DynamicList<vector> subFaceAreas_;
//- Submerged face areas
DynamicList<scalar> subFaceMagSf_;
//- Submerged face centers
DynamicList<vector> subFaceCentres_;
template<class Type>
class Vector4
:
public VectorSpace<Vector4<Type>, Type, 4>
{
public:
// Constructors
//- Construct null
inline Vector4()
{}
inline Type a() const
{
return this->v_[0];
}
inline Type b() const
{
return this->v_[1];
}
inline Type c() const
{
return this->v_[2];
}
inline Type d() const
{
return this->v_[3];
}
inline Type& a()
{
return this->v_[0];
}
inline Type& b()
{
return this->v_[1];
}
inline Type& c()
{
return this->v_[2];
}
inline Type& d()
{
return this->v_[3];
}
};
typedef Vector4<scalar> vector4;
//- Four point alpha values for cubic polynomial fit
vector4 pCubicAlphas_;
//- Four cell alpha values for cubic polynomial fit
vector4 cCubicAlphas_;
// Tetrahedron storage objects
//- Tetrahedron alpha point values
scalarField tetPointsAlpha_;
//- Tetrahedron velocity point values
vectorField tetPointsU_;
//- Tetrahedron points
pointField tetPoints_;
//- Tetrahedron surface area vectors
Vector4<vector> tetSf_;
//- Tetrahedron face centres
Vector4<vector> tetCf_;
//- Tetrahedron triangular faces addressing
const FixedList<face, 4> tetFaces_;
// Multicut addressing
//- Is addressing computed?
bool addressingCalculated_;
//- Local edge faces
DynamicList<DynamicList<label>> localEdgeFaces_;
//- Local face edges
DynamicList<DynamicList<label>> localFaceEdges_;
// Cell-point work arrays
DynamicList<scalar> cellPointsAlpha_;
DynamicList<scalar> pointsAlpha_;
// Private Member Functions
//- Match cell volume ratio to phase fraction
// Returns:
// - +1: success
// - 0: fail
// - -1: base scheme
label calcMatchAlphaCutCell
(
const MPLICcellStorage& cellInfo,
const bool tetDecom = false
);
//- Find in between which two point alpha values
// the target volume fraction lies
void findPointAlphaBounds
(
const MPLICcellStorage& cellInfo,
const bool tetDecom
);
//- Calculate the two interior point alpha values for the cubic fit
void calcPointAlphaInterior
(
const MPLICcellStorage& cellInfo,
const bool tetDecom
);
//- Solve the cubic fit
FixedList<scalar, 4> solveVanderMatrix() const;
//- Identifying roots of cubic equation matching target volume fraction
void findRoots
(
const MPLICcellStorage& cellInfo,
const FixedList<scalar, 4>& coeffs,
const bool tetDecom
);
//- Select simple cut or tet decomposition
scalar calcAlpha
(
const MPLICcellStorage& cellInfo,
const scalar target,
const bool tetDecom
);
//- Calculate current sub-cell volume
void calcSubCellVolume();
//- Calculate cell cut, volume and alpha
scalar calcCutCellVolumeAlpha
(
const MPLICcellStorage& cellInfo,
const scalar target
);
//- Calculate cell cut, volume and alpha by tet decomposition
scalar calcTetCutCellVolumeAlpha
(
const MPLICcellStorage& cellInfo,
const scalar target
);
//- Attempt single cut through the cell
// Returns:
// - 1: success
// - 0: fail
bool singleCutCell
(
const MPLICcellStorage& cellInfo,
const scalar target
);
//- Attempt multiple cuts through the cell
bool multiCutCell
(
const MPLICcellStorage& cellInfo,
const scalar target
);
//- Single cut through tet
bool cutTetCell
(
const scalar target,
const label faceOrig,
const bool ow
);
//- Calculate local addressing for multi-cut
inline void calcAddressing
(
const MPLICcellStorage& cellInfo
);
//- Append face area vectors and centers to cache
inline void appendSfCf
(
const vector& Sf,
const vector& Cf,
const scalar magSf,
const bool own = true
);
//- Calculating surface vector of unordered edges
inline bool cutStatusCalcSf();
//- Calculate cut surface area vector
inline vector calcCutSf() const;
//- Calculating surface center of unordered edges
inline vector calcCutCf(const vector& cutSf) const;
//- Calculate phiU
inline void phiU
(
const pointField& points,
const faceList& faces,
const labelList& cFaces,
const vectorField& pointsU
);
//- Resize and set all the cell face fields to 0
inline void resetFaceFields(const label nFaces);
//- Compute surface interpolation from area ratio
inline void calcAlphaf(const UIndirectList<scalar>& magSfs);
//- Compute surface interpolation from flux ratio
inline void calcAlphaUf();
//- Clear storage
inline void clear();
//- Clear single cut storage
inline void clearOneCut();
public:
// Constructors
//- Construct for given interpolation and PLIC type
MPLICcell
(
const bool unweighted = true,
const bool multiCut = true
);
// Member functions
//- Match cell volume ratios
bool matchAlpha
(
const MPLICcellStorage& cellInfo
);
//- Return face volume fraction
inline const DynamicList<scalar>& alphaf() const;
//- Return cut normal
inline const vector& cutNormal() const;
//- Return volume fraction corresponding to the cut
inline scalar cutAlpha() const;
//- Return sub-cell volume
inline scalar subCellVolume() const;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#include "MPLICcellI.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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