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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2013-2025 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 "intersectionCellsToCells.H"
#include "meshSearch.H"
#include "tetOverlapVolume.H"
#include "addToRunTimeSelectionTable.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
namespace cellsToCellss
{
defineTypeNameAndDebug(intersection, 0);
addToRunTimeSelectionTable(cellsToCells, intersection, word);
}
}
const Foam::scalar Foam::cellsToCellss::intersection::tolerance_ = 1e-6;
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
bool Foam::cellsToCellss::intersection::intersect
(
const polyMesh& srcMesh,
const polyMesh& tgtMesh,
const label srcCelli,
const label tgtCelli
) const
{
return
tetOverlapVolume().cellCellOverlapMinDecomp
(
srcMesh,
srcCelli,
tgtMesh,
tgtCelli,
treeBoundBox(tgtMesh.points(), tgtMesh.cellPoints()[tgtCelli]),
tolerance_*srcMesh.cellVolumes()[srcCelli]
);
}
Foam::scalar Foam::cellsToCellss::intersection::interVol
(
const polyMesh& srcMesh,
const polyMesh& tgtMesh,
const label srcCelli,
const label tgtCelli
) const
{
return
tetOverlapVolume().cellCellOverlapVolumeMinDecomp
(
srcMesh,
srcCelli,
tgtMesh,
tgtCelli,
treeBoundBox(tgtMesh.points(), tgtMesh.cellPoints()[tgtCelli])
);
}
bool Foam::cellsToCellss::intersection::findInitialSeeds
(
const polyMesh& srcMesh,
const polyMesh& tgtMesh,
const labelList& srcCellIDs,
const boolList& mapFlag,
const label startSeedI,
label& srcSeedI,
label& tgtSeedI
) const
{
const cellList& srcCells = srcMesh.cells();
const faceList& srcFaces = srcMesh.faces();
const pointField& srcPts = srcMesh.points();
const meshSearch& tgtSearchEngine = meshSearch::New(tgtMesh);
for (label i = startSeedI; i < srcCellIDs.size(); i++)
{
const label srcI = srcCellIDs[i];
if (mapFlag[srcI])
{
const labelList tgtIDs
(
tgtSearchEngine.cellTree().findBox
(
treeBoundBox(srcCells[srcI].bb(srcPts, srcFaces))
)
);
forAll(tgtIDs, j)
{
const label tgtI = tgtIDs[j];
if (intersect(srcMesh, tgtMesh, srcI, tgtI))
{
srcSeedI = srcI;
tgtSeedI = tgtI;
return true;
}
}
}
}
if (debug)
{
Pout<< "could not find starting seed" << endl;
}
return false;
}
Foam::scalar Foam::cellsToCellss::intersection::calculateAddressing
(
const polyMesh& srcMesh,
const polyMesh& tgtMesh,
labelListList& srcToTgtCellAddr,
scalarListList& srcToTgtCellWght,
labelListList& tgtToSrcCellAddr,
scalarListList& tgtToSrcCellWght,
const label srcSeedI,
const label tgtSeedI,
const labelList& srcCellIDs,
boolList& mapFlag,
label& startSeedI
)
{
scalar V = 0;
label srcCelli = srcSeedI;
label tgtCelli = tgtSeedI;
List<DynamicList<label>> srcToTgtAddr(srcMesh.nCells());
List<DynamicList<scalar>> srcToTgtWght(srcMesh.nCells());
List<DynamicList<label>> tgtToSrcAddr(tgtMesh.nCells());
List<DynamicList<scalar>> tgtToSrcWght(tgtMesh.nCells());
// list of tgt cell neighbour cells
DynamicList<label> nbrTgtCells(10);
// list of tgt cells currently visited for srcCelli to avoid multiple hits
DynamicList<label> visitedTgtCells(10);
// list to keep track of tgt cells used to seed src cells
labelList seedCells(srcMesh.nCells(), -1);
seedCells[srcCelli] = tgtCelli;
const scalarField& srcVol = srcMesh.cellVolumes();
do
{
nbrTgtCells.clear();
visitedTgtCells.clear();
// append initial target cell and neighbours
nbrTgtCells.append(tgtCelli);
appendNbrCells(tgtCelli, tgtMesh, visitedTgtCells, nbrTgtCells);
do
{
tgtCelli = nbrTgtCells.remove();
visitedTgtCells.append(tgtCelli);
scalar vol = interVol(srcMesh, tgtMesh, srcCelli, tgtCelli);
// accumulate addressing and weights for valid intersection
if (vol/srcVol[srcCelli] > tolerance_)
{
// store src/tgt cell pair
srcToTgtAddr[srcCelli].append(tgtCelli);
srcToTgtWght[srcCelli].append(vol);
tgtToSrcAddr[tgtCelli].append(srcCelli);
tgtToSrcWght[tgtCelli].append(vol);
appendNbrCells(tgtCelli, tgtMesh, visitedTgtCells, nbrTgtCells);
// accumulate intersection volume
V += vol;
}
}
while (!nbrTgtCells.empty());
mapFlag[srcCelli] = false;
// find new source seed cell
setNextCells
(
srcMesh,
tgtMesh,
startSeedI,
srcCelli,
tgtCelli,
srcCellIDs,
mapFlag,
visitedTgtCells,
seedCells
);
}
while (srcCelli != -1);
// transfer addressing into persistent storage
forAll(srcToTgtCellAddr, i)
{
srcToTgtCellAddr[i].transfer(srcToTgtAddr[i]);
srcToTgtCellWght[i].transfer(srcToTgtWght[i]);
}
forAll(tgtToSrcCellAddr, i)
{
tgtToSrcCellAddr[i].transfer(tgtToSrcAddr[i]);
tgtToSrcCellWght[i].transfer(tgtToSrcWght[i]);
}
return V;
}
void Foam::cellsToCellss::intersection::setNextCells
(
const polyMesh& srcMesh,
const polyMesh& tgtMesh,
label& startSeedI,
label& srcCelli,
label& tgtCelli,
const labelList& srcCellIDs,
const boolList& mapFlag,
const DynamicList<label>& visitedCells,
labelList& seedCells
) const
{
const labelList& srcNbrCells = srcMesh.cellCells()[srcCelli];
// set possible seeds for later use by querying all src cell neighbours
// with all visited target cells
bool valuesSet = false;
forAll(srcNbrCells, i)
{
label cellS = srcNbrCells[i];
if (mapFlag[cellS] && seedCells[cellS] == -1)
{
forAll(visitedCells, j)
{
label cellT = visitedCells[j];
if (intersect(srcMesh, tgtMesh, cellS, cellT))
{
seedCells[cellS] = cellT;
if (!valuesSet)
{
srcCelli = cellS;
tgtCelli = cellT;
valuesSet = true;
}
}
}
}
}
// set next src and tgt cells if not set above
if (valuesSet)
{
return;
}
else
{
// try to use existing seed
bool foundNextSeed = false;
for (label i = startSeedI; i < srcCellIDs.size(); i++)
{
label cellS = srcCellIDs[i];
if (mapFlag[cellS])
{
if (!foundNextSeed)
{
startSeedI = i;
foundNextSeed = true;
}
if (seedCells[cellS] != -1)
{
srcCelli = cellS;
tgtCelli = seedCells[cellS];
return;
}
}
}
// perform new search to find match
if (debug)
{
Pout<< "Advancing front stalled: searching for new "
<< "target cell" << endl;
}
bool restart =
findInitialSeeds
(
srcMesh,
tgtMesh,
srcCellIDs,
mapFlag,
startSeedI,
srcCelli,
tgtCelli
);
if (restart)
{
// successfully found new starting seed-pair
return;
}
}
// if we have got to here, there are no more src/tgt cell intersections
srcCelli = -1;
tgtCelli = -1;
}
// * * * * * * * * * * * * Protected Member Functions * * * * * * * * * * * //
Foam::scalar Foam::cellsToCellss::intersection::calculate
(
const polyMesh& srcMesh,
const polyMesh& tgtMesh
)
{
initialise(srcMesh, tgtMesh);
// Determine (potentially) participating source mesh cells
const labelList srcCellIDs(maskCells(srcMesh, tgtMesh));
// Initialise list to keep track of whether src cell can be mapped
boolList mapFlag(srcMesh.nCells(), false);
UIndirectList<bool>(mapFlag, srcCellIDs) = true;
// Find initial point in tgt mesh
label srcSeedI = -1;
label tgtSeedI = -1;
label startSeedI = 0;
bool startWalk =
findInitialSeeds
(
srcMesh,
tgtMesh,
srcCellIDs,
mapFlag,
startSeedI,
srcSeedI,
tgtSeedI
);
if (startWalk)
{
return
calculateAddressing
(
srcMesh,
tgtMesh,
srcLocalTgtCells_,
srcWeights_,
tgtLocalSrcCells_,
tgtWeights_,
srcSeedI,
tgtSeedI,
srcCellIDs,
mapFlag,
startSeedI
);
}
else
{
return 0;
}
}
void Foam::cellsToCellss::intersection::normalise
(
const polyMesh& srcMesh,
labelListList& srcToTgtAddr,
scalarListList& srcToTgtWght
) const
{
tetOverlapVolume overlapEngine;
forAll(srcToTgtWght, srcCelli)
{
const scalar v = overlapEngine.cellVolumeMinDecomp(srcMesh, srcCelli);
forAll(srcToTgtWght[srcCelli], i)
{
srcToTgtWght[srcCelli][i] /= v;
}
}
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::cellsToCellss::intersection::intersection()
:
cellsToCells()
{}
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
Foam::cellsToCellss::intersection::~intersection()
{}
// ************************************************************************* //
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