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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2026 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 "multiLevel.H"
#include "IFstream.H"
#include "globalIndex.H"
#include "distributionMap.H"
#include "addToRunTimeSelectionTable.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
namespace decompositionMethods
{
defineTypeNameAndDebug(multiLevel, 0);
addToRunTimeSelectionTable
(
decompositionMethod,
multiLevel,
decomposer
);
addToRunTimeSelectionTable
(
decompositionMethod,
multiLevel,
distributor
);
}
}
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
void Foam::decompositionMethods::multiLevel::subsetGlobalCellCells
(
const label nDomains,
const label domainI,
const labelList& dist,
const labelListList& cellCells,
const labelList& set,
labelListList& subCellCells,
labelList& cutConnections
) const
{
// Determine new index for cells by inverting subset
labelList oldToNew(invert(cellCells.size(), set));
globalIndex globalCells(cellCells.size());
// Subset locally the elements for which I have data
subCellCells = UIndirectList<labelList>(cellCells, set);
// Get new indices for neighbouring processors
List<Map<label>> compactMap;
distributionMap map(globalCells, subCellCells, compactMap);
map.distribute(oldToNew);
labelList allDist(dist);
map.distribute(allDist);
// Now we have:
// oldToNew : the locally-compact numbering of all our cellCells. -1 if
// cellCell is not in set.
// allDist : destination domain for all our cellCells
// subCellCells : indexes into oldToNew and allDist
// Globally compact numbering for cells in set.
globalIndex globalSubCells(set.size());
// Now subCellCells contains indices into oldToNew which are the
// new locations of the neighbouring cells.
cutConnections.setSize(nDomains);
cutConnections = 0;
forAll(subCellCells, subCelli)
{
labelList& cCells = subCellCells[subCelli];
// Keep the connections to valid mapped cells
label newI = 0;
forAll(cCells, i)
{
// Get locally-compact cell index of neighbouring cell
label nbrCelli = oldToNew[cCells[i]];
if (nbrCelli == -1)
{
cutConnections[allDist[cCells[i]]]++;
}
else
{
// Reconvert local cell index into global one
// Get original neighbour
label celli = set[subCelli];
label oldNbrCelli = cellCells[celli][i];
// Get processor from original neighbour
label proci = globalCells.whichProcID(oldNbrCelli);
// Convert into global compact numbering
cCells[newI++] = globalSubCells.toGlobal(proci, nbrCelli);
}
}
cCells.setSize(newI);
}
}
void Foam::decompositionMethods::multiLevel::decompose
(
const labelListList& pointPoints,
const pointField& points,
const scalarField& pointWeights,
const labelList& pointMap, // map back to original points
const label levelI,
labelField& decomp
)
{
labelList dist
(
methods_[levelI].decompose
(
pointPoints,
points,
pointWeights
)
);
forAll(pointMap, i)
{
label orig = pointMap[i];
decomp[orig] += dist[i];
}
if (levelI != methods_.size()-1)
{
// Recurse
// Determine points per domain
label n = methods_[levelI].nDomains();
labelListList domainToPoints(invertOneToMany(n, dist));
// 'Make space' for new levels of decomposition
decomp *= methods_[levelI+1].nDomains();
// Extract processor+local index from point-point addressing
if (debug && Pstream::master())
{
Pout<< "Decomposition at level " << levelI << " :" << endl;
}
for (label domainI = 0; domainI < n; domainI++)
{
// Extract elements for current domain
const labelList domainPoints(findIndices(dist, domainI));
// Subset point-wise data.
pointField subPoints(points, domainPoints);
scalarField subWeights(pointWeights, domainPoints);
labelList subPointMap(UIndirectList<label>(pointMap, domainPoints));
// Subset point-point addressing (adapt global numbering)
labelListList subPointPoints;
labelList nOutsideConnections;
subsetGlobalCellCells
(
n,
domainI,
dist,
pointPoints,
domainPoints,
subPointPoints,
nOutsideConnections
);
label nPoints = returnReduce(domainPoints.size(), addOp());
Pstream::listCombineGather(nOutsideConnections, addEqOp());
Pstream::listCombineScatter(nOutsideConnections);
label nPatches = 0;
label nFaces = 0;
forAll(nOutsideConnections, i)
{
if (nOutsideConnections[i] > 0)
{
nPatches++;
nFaces += nOutsideConnections[i];
}
}
string oldPrefix;
if (debug && Pstream::master())
{
Pout<< " Domain " << domainI << nl
<< " Number of cells = " << nPoints << nl
<< " Number of inter-domain patches = " << nPatches
<< nl
<< " Number of inter-domain faces = " << nFaces << nl
<< endl;
oldPrefix = Pout.prefix();
Pout.prefix() = " " + oldPrefix;
}
decompose
(
subPointPoints,
subPoints,
subWeights,
subPointMap,
levelI+1,
decomp
);
if (debug && Pstream::master())
{
Pout.prefix() = oldPrefix;
}
}
}
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::decompositionMethods::multiLevel::multiLevel
(
const dictionary& decompositionDict,
const dictionary& methodDict
)
:
decompositionMethod(decompositionDict)
{
methods_.setSize(methodDict.size());
label i = 0;
forAllConstIter(dictionary, methodDict, iter)
{
methods_.set(i++, decompositionMethod::NewDecomposer(iter().dict()));
}
label n = 1;
Info<< "decompositionMethod " << type() << " :" << endl;
forAll(methods_, i)
{
Info<< " level " << i << " decomposing with " << methods_[i].type()
<< " into " << methods_[i].nDomains() << " subdomains." << endl;
n *= methods_[i].nDomains();
}
if (n != nDomains())
{
FatalErrorInFunction
<< "Top level decomposition specifies " << nDomains()
<< " domains which is not equal to the product of"
<< " all sub domains " << n
<< exit(FatalError);
}
}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
Foam::labelList Foam::decompositionMethods::multiLevel::decompose
(
const polyMesh& mesh,
const pointField& cellCentres,
const scalarField& cellWeights
)
{
CompactListList<label> cellCells;
calcCellCells
(
mesh,
identityMap(cellCentres.size()),
cellCentres.size(),
true,
cellCells
);
labelField decomp(cellCentres.size(), 0);
labelList cellMap(identityMap(cellCentres.size()));
decompose
(
cellCells.list(),
cellCentres,
cellWeights,
cellMap, // map back to original cells
0,
decomp
);
return decomp;
}
Foam::labelList Foam::decompositionMethods::multiLevel::decompose
(
const labelListList& globalPointPoints,
const pointField& points,
const scalarField& pointWeights
)
{
labelField decomp(points.size(), 0);
labelList pointMap(identityMap(points.size()));
decompose
(
globalPointPoints,
points,
pointWeights,
pointMap, // map back to original points
0,
decomp
);
return decomp;
}
// ************************************************************************* //
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