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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 "fvRegionSplit.H"
#include "FvFaceCellWave.H"
#include "globalIndex.H"
#include "minData.H"
#include "coupledFvPatchFields.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
defineTypeNameAndDebug(fvRegionSplit, 0);
}
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
void Foam::fvRegionSplit::calcNonCompactRegionSplit
(
const globalIndex& globalFaces,
const volScalarField& isoField,
const scalar isoValue,
labelList& cellRegion
) const
{
// Initialise wave data. Blocked faces are given a negative number, so it
// is always less than that of the global face indices, so the walk will
// not cross them
List<minData> internalFaceData(mesh().nInternalFaces());
label nUnblocked = 0;
if (isNull(isoField))
{
nUnblocked = mesh().nInternalFaces();
}
else
{
forAll(internalFaceData, internalFacei)
{
const label own = mesh().owner()[internalFacei];
const label nbr = mesh().neighbour()[internalFacei];
if ((isoField[own] < isoValue) != (isoField[nbr] < isoValue))
{
internalFaceData[internalFacei] = minData(-2);
}
else
{
nUnblocked ++;
}
}
}
List<List<minData>> patchFaceData(mesh().boundary().size());
forAll(patchFaceData, patchi)
{
const fvPatchScalarField& pf = isoField.boundaryField()[patchi];
patchFaceData[patchi].resize(pf.size());
if (isNull(isoField) || !pf.coupled())
{
nUnblocked += pf.size();
}
else
{
tmp<scalarField> tpnf =
refCast<const coupledFvPatchScalarField>(pf)
.patchNeighbourField();
const scalarField& pnf = tpnf();
forAll(patchFaceData[patchi], patchFacei)
{
if ((pf[patchFacei] < isoValue) != (pnf[patchFacei] < isoValue))
{
patchFaceData[patchi][patchFacei] = minData(-2);
}
else
{
nUnblocked ++;
}
}
}
}
List<minData> cellData(mesh().nCells());
// Seed all unblocked faces with a globally unique number
List<labelPair> seedPatchAndFaces(nUnblocked);
List<minData> seedData(nUnblocked);
auto& td = FvFaceCellWave<minData>::defaultTrackingData_;
nUnblocked = 0;
forAll(internalFaceData, internalFacei)
{
if (!internalFaceData[internalFacei].valid(td))
{
seedPatchAndFaces[nUnblocked] = labelPair(-1, internalFacei);
seedData[nUnblocked] = minData(globalFaces.toGlobal(internalFacei));
nUnblocked ++;
}
}
forAll(patchFaceData, patchi)
{
forAll(patchFaceData[patchi], patchFacei)
{
if (!patchFaceData[patchi][patchFacei].valid(td))
{
seedPatchAndFaces[nUnblocked] = labelPair(patchi, patchFacei);
seedData[nUnblocked] =
minData
(
globalFaces.toGlobal
(
mesh().polyFacesBf()[patchi][patchFacei]
)
);
nUnblocked ++;
}
}
}
// Propagate information inwards
FvFaceCellWave<minData> deltaCalc
(
mesh(),
seedPatchAndFaces,
seedData,
internalFaceData,
patchFaceData,
cellData,
mesh().globalData().nTotalCells() + 1,
FvFaceCellWave<minData>::defaultTrackingData_
);
// Extract into the cells
cellRegion.setSize(mesh().nCells());
forAll(cellRegion, celli)
{
if (cellData[celli].valid(deltaCalc.data()))
{
cellRegion[celli] = cellData[celli].data();
}
else
{
// Unvisited cell. This is only possible if it is surrounded by
// blocked faces. If so make up region from any of the faces.
const label facei = mesh().cells()[celli][0];
cellRegion[celli] = globalFaces.toGlobal(facei);
}
}
}
Foam::label Foam::fvRegionSplit::calcRegionSplit
(
const volScalarField& isoField,
const scalar isoValue,
labelList& cellRegion
) const
{
// Create global face index
const globalIndex globalFaces(mesh().nFaces());
// Minimise regions across connected cells. This leaves cellRegion
// containing the minimum face index in the contiguous region of mesh.
calcNonCompactRegionSplit(globalFaces, isoField, isoValue, cellRegion);
// Compact and return
return compactGlobalRegionSplit(globalFaces, cellRegion);
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::fvRegionSplit::fvRegionSplit(const fvMesh& mesh)
:
regionSplitBase(mesh.nCells()),
mesh_(mesh)
{
nRegions_ =
calcRegionSplit
(
NullObjectRef<volScalarField>(),
NaN,
*this
);
}
Foam::fvRegionSplit::fvRegionSplit
(
const fvMesh& mesh,
const volScalarField& isoField,
const scalar isoValue
)
:
regionSplitBase(mesh.nCells()),
mesh_(mesh)
{
nRegions_ =
calcRegionSplit
(
isoField,
isoValue,
*this
);
}
// ************************************************************************* //
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