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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 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/>.
\*---------------------------------------------------------------------------*/
#include "multiNearestCellsToCellsExtrapolation.H"
#include "globalIndex.H"
#include "patchRegionSplit.H"
#include "wallPoint.H"
#include "WallLocationData.H"
#include "WallInfo.H"
#include "FaceCellWave.H"
#include "distributionMap.H"
#include "addToRunTimeSelectionTable.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
namespace cellsToCellsExtrapolations
{
defineTypeNameAndDebug(multiNearest, 0);
addToRunTimeSelectionTable(cellsToCellsExtrapolation, multiNearest, word);
}
}
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
template<class Type>
void Foam::cellsToCellsExtrapolations::multiNearest::extrapolateType
(
Field<Type>& fld
) const
{
if (!extrapolation_) return;
// Communicate remote field values as necessary
tmp<Field<Type>> srcFld;
if (Pstream::parRun())
{
srcFld = fld.clone();
extrapolationMapPtr_->distribute(srcFld.ref());
}
else
{
srcFld = tmp<Field<Type>>(fld);
}
// Set the values in the uncoupled cells
forAll(uncoupledCells_, uncoupledCelli)
{
const label celli = uncoupledCells_[uncoupledCelli];
fld[celli] = Zero;
forAll(uncoupledCellLocalCells_[uncoupledCelli], i)
{
fld[celli] +=
uncoupledCellWeights_[uncoupledCelli][i]
*srcFld()[uncoupledCellLocalCells_[uncoupledCelli][i]];
}
}
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::cellsToCellsExtrapolations::multiNearest::multiNearest()
:
cellsToCellsExtrapolation(),
uncoupledCellLocalCells_(),
uncoupledCellWeights_(),
extrapolationMapPtr_(nullptr)
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
Foam::cellsToCellsExtrapolations::multiNearest::~multiNearest()
{}
// * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
void Foam::cellsToCellsExtrapolations::multiNearest::update
(
const polyMesh& mesh,
const PackedBoolList& cellCoupleds
)
{
cellsToCellsExtrapolation::update(cellCoupleds);
// Quick return if nothing is to be done
if (!extrapolation_) return;
// Global cell addressing
const globalIndex globalCellIndex(mesh.nCells());
// Get the list of faces which separate regions which do and do not need
// extrapolation. For each face, also get the global index of the adjacent
// cell which is coupled. Group them into continuous zones.
labelListList zoneCutFaces, zoneCutFaceCoupledCells;
{
labelList cutFaces, cutFacesCoupledCells;
getCutFaces
(
mesh,
cellCoupleds,
globalCellIndex,
cutFaces,
cutFacesCoupledCells
);
const patchRegionSplit cutFaceZones(mesh, cutFaces);
labelList zoneNCutFaces(cutFaceZones.nRegions(), 0);
forAll(cutFaces, cutFacei)
{
const label zonei = cutFaceZones[cutFacei];
zoneNCutFaces[zonei] ++;
}
zoneCutFaces.resize(cutFaceZones.nRegions());
zoneCutFaceCoupledCells.resize(cutFaceZones.nRegions());
forAll(zoneNCutFaces, zonei)
{
zoneCutFaces[zonei].resize(zoneNCutFaces[zonei]);
zoneCutFaceCoupledCells[zonei].resize(zoneNCutFaces[zonei]);
}
zoneNCutFaces = 0;
forAll(cutFaces, cutFacei)
{
const label zonei = cutFaceZones[cutFacei];
zoneCutFaces[zonei][zoneNCutFaces[zonei]] =
cutFaces[cutFacei];
zoneCutFaceCoupledCells[zonei][zoneNCutFaces[zonei]] =
cutFacesCoupledCells[cutFacei];
zoneNCutFaces[zonei] ++;
}
}
// Initialise wave data. Give coupled cells a distance of zero, so that the
// wave does not waste time propagating into coupled sections of the mesh.
typedef WallInfo<WallLocationData<wallPoint, label>> info;
List<info> faceInfos(mesh.nFaces()), cellInfos(mesh.nCells());
forAll(cellCoupleds, celli)
{
if (cellCoupleds[celli])
{
cellInfos[celli] =
info
(
globalCellIndex.toGlobal(celli),
mesh.cellCentres()[celli],
0
);
}
}
//- Wave from each zone in turn. For each uncoupled cell that gets visited,
// note the global index of the nearest cell and store a weight equal to
// one-divided-by the distance.
List<DynamicList<label>> uncoupledCellLocalCellsDyn(uncoupledCells_.size());
List<DynamicList<scalar>> uncoupledCellWeightsDyn(uncoupledCells_.size());
forAll(zoneCutFaces, zonei)
{
const labelList& cutFaces = zoneCutFaces[zonei];
const labelList& cutFacesCoupledCells = zoneCutFaceCoupledCells[zonei];
List<info> cutFaceInfos(cutFaces.size());
forAll(cutFaces, cutFacei)
{
cutFaceInfos[cutFacei] =
info
(
cutFacesCoupledCells[cutFacei],
mesh.faceCentres()[cutFaces[cutFacei]],
0
);
}
FaceCellWave<info> wave
(
mesh,
cutFaces,
cutFaceInfos,
faceInfos,
cellInfos,
mesh.globalData().nTotalCells() + 1 // max iterations
);
forAll(uncoupledCells_, uncoupledCelli)
{
const label celli = uncoupledCells_[uncoupledCelli];
if (cellInfos[celli].valid(wave.data()))
{
uncoupledCellLocalCellsDyn[uncoupledCelli].append
(
cellInfos[celli].data()
);
uncoupledCellWeightsDyn[uncoupledCelli].append
(
1/sqrt(cellInfos[celli].distSqr())
);
}
}
// Reset the wave data for the next zone
forAll(uncoupledCells_, uncoupledCelli)
{
const label celli = uncoupledCells_[uncoupledCelli];
cellInfos[celli] = info();
forAll(mesh.cells()[celli], cellFacei)
{
const label facei = mesh.cells()[celli][cellFacei];
faceInfos[facei] = info();
}
}
}
// Transfer to class storage
uncoupledCellLocalCells_.resize(uncoupledCells_.size());
uncoupledCellWeights_.resize(uncoupledCells_.size());
forAll(uncoupledCells_, uncoupledCelli)
{
uncoupledCellLocalCells_[uncoupledCelli].transfer
(
uncoupledCellLocalCellsDyn[uncoupledCelli]
);
uncoupledCellWeights_[uncoupledCelli].transfer
(
uncoupledCellWeightsDyn[uncoupledCelli]
);
}
// Check that the wave connected to all uncoupled cells
forAll(uncoupledCells_, uncoupledCelli)
{
if (uncoupledCellLocalCells_[uncoupledCelli].empty())
{
const label celli = uncoupledCells_[uncoupledCelli];
FatalErrorInFunction
<< "Un-coupled cell " << celli << " of mesh " << mesh.name()
<< " on processor " << Pstream::myProcNo() << " with centre "
<< "at " << mesh.cellCentres()[celli] << " was not connected "
<< "to a coupled cell by the extrapolation wave. This "
<< "indicates that an entire non-contiguous region of mesh "
<< "lies outside of the other mesh being mapped to. This is "
<< "not recoverable." << exit(FatalError);
}
}
// Normalise the weights
forAll(uncoupledCells_, uncoupledCelli)
{
scalar w = 0;
forAll(uncoupledCellWeights_[uncoupledCelli], i)
{
w += uncoupledCellWeights_[uncoupledCelli][i];
}
forAll(uncoupledCellWeights_[uncoupledCelli], i)
{
uncoupledCellWeights_[uncoupledCelli][i] /= w;
}
}
// Construct the distribution map, if necessary
if (Pstream::parRun())
{
List<Map<label>> compactMap;
extrapolationMapPtr_.reset
(
new distributionMap
(
globalCellIndex,
uncoupledCellLocalCells_,
compactMap
)
);
}
}
#define implementExtrapolateType(Type, nullArg) \
void Foam::cellsToCellsExtrapolations::multiNearest::extrapolate \
( \
Field<Type>& fld \
) const \
{ \
extrapolateType(fld); \
}
FOR_ALL_FIELD_TYPES(implementExtrapolateType);
#undef implementExtrapolateType
// ************************************************************************* //
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