splitMeshRegions.C 55.6 KB
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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
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    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
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     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

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    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.
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    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
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    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
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Application
    splitMeshRegions

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Description
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    Splits mesh into multiple regions.

    Each region is defined as a domain whose cells can all be reached by
    cell-face-cell walking without crossing
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    - boundary faces
    - additional faces from faceset (-blockedFaces faceSet).
    - any face inbetween differing cellZones (-cellZones)

    Output is:
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    - volScalarField with regions as different scalars (-detectOnly) or
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    - mesh with multiple regions or
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    - mesh with cells put into cellZones (-makeCellZones)

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    Note:
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    - cellZonesOnly does not do a walk and uses the cellZones only. Use
    this if you don't mind having disconnected domains in a single region.
    This option requires all cells to be in one (and one only) cellZone.

    - cellZonesFileOnly behaves like -cellZonesOnly but reads the cellZones
    from the specified file. This allows one to explicitly specify the region
    distribution and still have multiple cellZones per region.

    - useCellZonesOnly does not do a walk and uses the cellZones only. Use
    this if you don't mind having disconnected domains in a single region.
    This option requires all cells to be in one (and one only) cellZone.


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    - Should work in parallel.
    cellZones can differ on either side of processor boundaries in which case
    the faces get moved from processor patch to directMapped patch. Not
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    very well tested.

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    - If a cell zone gets split into more than one region it can detect
    the largest matching region (-sloppyCellZones). This will accept any
    region that covers more than 50% of the zone. It has to be a subset
    so cannot have any cells in any other zone.
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    - writes maps like decomposePar back to original mesh:
        - pointRegionAddressing : for every point in this region the point in
        the original mesh
        - cellRegionAddressing  :   ,,      cell                ,,  cell    ,,
        - faceRegionAddressing  :   ,,      face                ,,  face in
        the original mesh + 'turning index'. For a face in the same orientation
        this is the original facelabel+1, for a turned face this is -facelabel-1
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\*---------------------------------------------------------------------------*/

#include "SortableList.H"
#include "argList.H"
#include "regionSplit.H"
#include "fvMeshSubset.H"
#include "IOobjectList.H"
#include "volFields.H"
#include "faceSet.H"
#include "cellSet.H"
#include "polyTopoChange.H"
#include "removeCells.H"
#include "EdgeMap.H"
#include "syncTools.H"
#include "ReadFields.H"
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#include "directMappedWallPolyPatch.H"
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#include "zeroGradientFvPatchFields.H"
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using namespace Foam;

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

template<class GeoField>
void addPatchFields(fvMesh& mesh, const word& patchFieldType)
{
    HashTable<const GeoField*> flds
    (
        mesh.objectRegistry::lookupClass<GeoField>()
    );

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    forAllConstIter(typename HashTable<const GeoField*>, flds, iter)
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    {
        const GeoField& fld = *iter();

        typename GeoField::GeometricBoundaryField& bfld =
            const_cast<typename GeoField::GeometricBoundaryField&>
            (
                fld.boundaryField()
            );

        label sz = bfld.size();
        bfld.setSize(sz+1);
        bfld.set
        (
            sz,
            GeoField::PatchFieldType::New
            (
                patchFieldType,
                mesh.boundary()[sz],
                fld.dimensionedInternalField()
            )
        );
    }
}


// Remove last patch field
template<class GeoField>
void trimPatchFields(fvMesh& mesh, const label nPatches)
{
    HashTable<const GeoField*> flds
    (
        mesh.objectRegistry::lookupClass<GeoField>()
    );

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    forAllConstIter(typename HashTable<const GeoField*>, flds, iter)
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    {
        const GeoField& fld = *iter();

        const_cast<typename GeoField::GeometricBoundaryField&>
        (
            fld.boundaryField()
        ).setSize(nPatches);
    }
}


// Reorder patch field
template<class GeoField>
void reorderPatchFields(fvMesh& mesh, const labelList& oldToNew)
{
    HashTable<const GeoField*> flds
    (
        mesh.objectRegistry::lookupClass<GeoField>()
    );

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    forAllConstIter(typename HashTable<const GeoField*>, flds, iter)
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    {
        const GeoField& fld = *iter();

        typename GeoField::GeometricBoundaryField& bfld =
            const_cast<typename GeoField::GeometricBoundaryField&>
            (
                fld.boundaryField()
            );

        bfld.reorder(oldToNew);
    }
}


// Adds patch if not yet there. Returns patchID.
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label addPatch(fvMesh& mesh, const polyPatch& patch)
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{
    polyBoundaryMesh& polyPatches =
        const_cast<polyBoundaryMesh&>(mesh.boundaryMesh());

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    label patchI = polyPatches.findPatchID(patch.name());
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    if (patchI != -1)
    {
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        if (polyPatches[patchI].type() == patch.type())
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        {
            // Already there
            return patchI;
        }
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        else
        {
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            FatalErrorIn("addPatch(fvMesh&, const polyPatch*)")
                << "Already have patch " << patch.name()
                << " but of type " << patch.type()
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                << exit(FatalError);
        }
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    }


    label insertPatchI = polyPatches.size();
    label startFaceI = mesh.nFaces();

    forAll(polyPatches, patchI)
    {
        const polyPatch& pp = polyPatches[patchI];

        if (isA<processorPolyPatch>(pp))
        {
            insertPatchI = patchI;
            startFaceI = pp.start();
            break;
        }
    }


    // Below is all quite a hack. Feel free to change once there is a better
    // mechanism to insert and reorder patches.

    // Clear local fields and e.g. polyMesh parallelInfo.
    mesh.clearOut();

    label sz = polyPatches.size();

    fvBoundaryMesh& fvPatches = const_cast<fvBoundaryMesh&>(mesh.boundary());

    // Add polyPatch at the end
    polyPatches.setSize(sz+1);
    polyPatches.set
    (
        sz,
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        patch.clone
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        (
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            polyPatches,
            insertPatchI,   //index
            0,              //size
            startFaceI      //start
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        )
    );
    fvPatches.setSize(sz+1);
    fvPatches.set
    (
        sz,
        fvPatch::New
        (
            polyPatches[sz],  // point to newly added polyPatch
            mesh.boundary()
        )
    );

    addPatchFields<volScalarField>
    (
        mesh,
        calculatedFvPatchField<scalar>::typeName
    );
    addPatchFields<volVectorField>
    (
        mesh,
        calculatedFvPatchField<vector>::typeName
    );
    addPatchFields<volSphericalTensorField>
    (
        mesh,
        calculatedFvPatchField<sphericalTensor>::typeName
    );
    addPatchFields<volSymmTensorField>
    (
        mesh,
        calculatedFvPatchField<symmTensor>::typeName
    );
    addPatchFields<volTensorField>
    (
        mesh,
        calculatedFvPatchField<tensor>::typeName
    );

    // Surface fields

    addPatchFields<surfaceScalarField>
    (
        mesh,
        calculatedFvPatchField<scalar>::typeName
    );
    addPatchFields<surfaceVectorField>
    (
        mesh,
        calculatedFvPatchField<vector>::typeName
    );
    addPatchFields<surfaceSphericalTensorField>
    (
        mesh,
        calculatedFvPatchField<sphericalTensor>::typeName
    );
    addPatchFields<surfaceSymmTensorField>
    (
        mesh,
        calculatedFvPatchField<symmTensor>::typeName
    );
    addPatchFields<surfaceTensorField>
    (
        mesh,
        calculatedFvPatchField<tensor>::typeName
    );

    // Create reordering list
    // patches before insert position stay as is
    labelList oldToNew(sz+1);
    for (label i = 0; i < insertPatchI; i++)
    {
        oldToNew[i] = i;
    }
    // patches after insert position move one up
    for (label i = insertPatchI; i < sz; i++)
    {
        oldToNew[i] = i+1;
    }
    // appended patch gets moved to insert position
    oldToNew[sz] = insertPatchI;

    // Shuffle into place
    polyPatches.reorder(oldToNew);
    fvPatches.reorder(oldToNew);

    reorderPatchFields<volScalarField>(mesh, oldToNew);
    reorderPatchFields<volVectorField>(mesh, oldToNew);
    reorderPatchFields<volSphericalTensorField>(mesh, oldToNew);
    reorderPatchFields<volSymmTensorField>(mesh, oldToNew);
    reorderPatchFields<volTensorField>(mesh, oldToNew);
    reorderPatchFields<surfaceScalarField>(mesh, oldToNew);
    reorderPatchFields<surfaceVectorField>(mesh, oldToNew);
    reorderPatchFields<surfaceSphericalTensorField>(mesh, oldToNew);
    reorderPatchFields<surfaceSymmTensorField>(mesh, oldToNew);
    reorderPatchFields<surfaceTensorField>(mesh, oldToNew);

    return insertPatchI;
}


// Reorder and delete patches.
void reorderPatches
(
    fvMesh& mesh,
    const labelList& oldToNew,
    const label nNewPatches
)
{
    polyBoundaryMesh& polyPatches =
        const_cast<polyBoundaryMesh&>(mesh.boundaryMesh());
    fvBoundaryMesh& fvPatches = const_cast<fvBoundaryMesh&>(mesh.boundary());

    // Shuffle into place
    polyPatches.reorder(oldToNew);
    fvPatches.reorder(oldToNew);

    reorderPatchFields<volScalarField>(mesh, oldToNew);
    reorderPatchFields<volVectorField>(mesh, oldToNew);
    reorderPatchFields<volSphericalTensorField>(mesh, oldToNew);
    reorderPatchFields<volSymmTensorField>(mesh, oldToNew);
    reorderPatchFields<volTensorField>(mesh, oldToNew);
    reorderPatchFields<surfaceScalarField>(mesh, oldToNew);
    reorderPatchFields<surfaceVectorField>(mesh, oldToNew);
    reorderPatchFields<surfaceSphericalTensorField>(mesh, oldToNew);
    reorderPatchFields<surfaceSymmTensorField>(mesh, oldToNew);
    reorderPatchFields<surfaceTensorField>(mesh, oldToNew);

    // Remove last.
    polyPatches.setSize(nNewPatches);
    fvPatches.setSize(nNewPatches);
    trimPatchFields<volScalarField>(mesh, nNewPatches);
    trimPatchFields<volVectorField>(mesh, nNewPatches);
    trimPatchFields<volSphericalTensorField>(mesh, nNewPatches);
    trimPatchFields<volSymmTensorField>(mesh, nNewPatches);
    trimPatchFields<volTensorField>(mesh, nNewPatches);
    trimPatchFields<surfaceScalarField>(mesh, nNewPatches);
    trimPatchFields<surfaceVectorField>(mesh, nNewPatches);
    trimPatchFields<surfaceSphericalTensorField>(mesh, nNewPatches);
    trimPatchFields<surfaceSymmTensorField>(mesh, nNewPatches);
    trimPatchFields<surfaceTensorField>(mesh, nNewPatches);
}


template<class GeoField>
void subsetVolFields
(
    const fvMesh& mesh,
    const fvMesh& subMesh,
    const labelList& cellMap,
    const labelList& faceMap
)
{
    const labelList patchMap(identity(mesh.boundaryMesh().size()));

    HashTable<const GeoField*> fields
    (
        mesh.objectRegistry::lookupClass<GeoField>()
    );
    forAllConstIter(typename HashTable<const GeoField*>, fields, iter)
    {
        const GeoField& fld = *iter();

        Info<< "Mapping field " << fld.name() << endl;

        tmp<GeoField> tSubFld
        (
            fvMeshSubset::interpolate
            (
                fld,
                subMesh,
                patchMap,
                cellMap,
                faceMap
            )
        );

        // Hack: set value to 0 for introduced patches (since don't
        //       get initialised.
        forAll(tSubFld().boundaryField(), patchI)
        {
            const fvPatchField<typename GeoField::value_type>& pfld =
                tSubFld().boundaryField()[patchI];

            if
            (
                isA<calculatedFvPatchField<typename GeoField::value_type> >
                (pfld)
            )
            {
                tSubFld().boundaryField()[patchI] ==
                    pTraits<typename GeoField::value_type>::zero;
            }
        }

        // Store on subMesh
        GeoField* subFld = tSubFld.ptr();
        subFld->rename(fld.name());
        subFld->writeOpt() = IOobject::AUTO_WRITE;
        subFld->store();
    }
}


template<class GeoField>
void subsetSurfaceFields
(
    const fvMesh& mesh,
    const fvMesh& subMesh,
    const labelList& faceMap
)
{
    const labelList patchMap(identity(mesh.boundaryMesh().size()));

    HashTable<const GeoField*> fields
    (
        mesh.objectRegistry::lookupClass<GeoField>()
    );
    forAllConstIter(typename HashTable<const GeoField*>, fields, iter)
    {
        const GeoField& fld = *iter();

        Info<< "Mapping field " << fld.name() << endl;

        tmp<GeoField> tSubFld
        (
            fvMeshSubset::interpolate
            (
                fld,
                subMesh,
                patchMap,
                faceMap
            )
        );

        // Hack: set value to 0 for introduced patches (since don't
        //       get initialised.
        forAll(tSubFld().boundaryField(), patchI)
        {
            const fvsPatchField<typename GeoField::value_type>& pfld =
                tSubFld().boundaryField()[patchI];

            if
            (
                isA<calculatedFvsPatchField<typename GeoField::value_type> >
                (pfld)
            )
            {
                tSubFld().boundaryField()[patchI] ==
                    pTraits<typename GeoField::value_type>::zero;
            }
        }

        // Store on subMesh
        GeoField* subFld = tSubFld.ptr();
        subFld->rename(fld.name());
        subFld->writeOpt() = IOobject::AUTO_WRITE;
        subFld->store();
    }
}

// Select all cells not in the region
labelList getNonRegionCells(const labelList& cellRegion, const label regionI)
{
    DynamicList<label> nonRegionCells(cellRegion.size());
    forAll(cellRegion, cellI)
    {
        if (cellRegion[cellI] != regionI)
        {
            nonRegionCells.append(cellI);
        }
    }
    return nonRegionCells.shrink();
}


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// Get per region-region interface the sizes. If sumParallel sums sizes.
// Returns interfaces as straight list for looping in identical order.
void getInterfaceSizes
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(
    const polyMesh& mesh,
    const labelList& cellRegion,
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    const bool sumParallel,

    edgeList& interfaces,
    EdgeMap<label>& interfaceSizes
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)
{
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    // Internal faces
    // ~~~~~~~~~~~~~~

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    forAll(mesh.faceNeighbour(), faceI)
    {
        label ownRegion = cellRegion[mesh.faceOwner()[faceI]];
        label neiRegion = cellRegion[mesh.faceNeighbour()[faceI]];

        if (ownRegion != neiRegion)
        {
            edge interface
            (
                min(ownRegion, neiRegion),
                max(ownRegion, neiRegion)
            );

            EdgeMap<label>::iterator iter = interfaceSizes.find(interface);

            if (iter != interfaceSizes.end())
            {
                iter()++;
            }
            else
            {
                interfaceSizes.insert(interface, 1);
            }
        }
    }

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    // Boundary faces
    // ~~~~~~~~~~~~~~

    // Neighbour cellRegion.
    labelList coupledRegion(mesh.nFaces()-mesh.nInternalFaces());

    forAll(coupledRegion, i)
    {
        label cellI = mesh.faceOwner()[i+mesh.nInternalFaces()];
        coupledRegion[i] = cellRegion[cellI];
    }
    syncTools::swapBoundaryFaceList(mesh, coupledRegion, false);

    forAll(coupledRegion, i)
    {
        label faceI = i+mesh.nInternalFaces();
        label ownRegion = cellRegion[mesh.faceOwner()[faceI]];
        label neiRegion = coupledRegion[i];

        if (ownRegion != neiRegion)
        {
            edge interface
            (
                min(ownRegion, neiRegion),
                max(ownRegion, neiRegion)
            );

            EdgeMap<label>::iterator iter = interfaceSizes.find(interface);

            if (iter != interfaceSizes.end())
            {
                iter()++;
            }
            else
            {
                interfaceSizes.insert(interface, 1);
            }
        }
    }


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    if (sumParallel && Pstream::parRun())
    {
        if (Pstream::master())
        {
            // Receive and add to my sizes
            for
            (
                int slave=Pstream::firstSlave();
                slave<=Pstream::lastSlave();
                slave++
            )
            {
                IPstream fromSlave(Pstream::blocking, slave);

                EdgeMap<label> slaveSizes(fromSlave);

                forAllConstIter(EdgeMap<label>, slaveSizes, slaveIter)
                {
                    EdgeMap<label>::iterator masterIter =
                        interfaceSizes.find(slaveIter.key());

                    if (masterIter != interfaceSizes.end())
                    {
                        masterIter() += slaveIter();
                    }
                    else
                    {
                        interfaceSizes.insert(slaveIter.key(), slaveIter());
                    }
                }
            }

            // Distribute
            for
            (
                int slave=Pstream::firstSlave();
                slave<=Pstream::lastSlave();
                slave++
            )
            {
                // Receive the edges using shared points from the slave.
                OPstream toSlave(Pstream::blocking, slave);
                toSlave << interfaceSizes;
            }
        }
        else
        {
            // Send to master
            {
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                OPstream toMaster(Pstream::blocking, Pstream::masterNo());
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                toMaster << interfaceSizes;
            }
            // Receive from master
            {
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                IPstream fromMaster(Pstream::blocking, Pstream::masterNo());
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                fromMaster >> interfaceSizes;
            }
        }
    }

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    // Make sure all processors have interfaces in same order
    interfaces = interfaceSizes.toc();
    if (sumParallel)
    {
        Pstream::scatter(interfaces);
    }
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}


// Create mesh for region.
autoPtr<mapPolyMesh> createRegionMesh
(
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    const labelList& cellRegion,
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    const EdgeMap<label>& interfaceToPatch,
    const fvMesh& mesh,
    const label regionI,
    const word& regionName,
    autoPtr<fvMesh>& newMesh
)
{
    // Create dummy system/fv*
    {
        IOobject io
        (
            "fvSchemes",
            mesh.time().system(),
            regionName,
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            mesh,
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            IOobject::NO_READ,
            IOobject::NO_WRITE,
            false
        );

        Info<< "Testing:" << io.objectPath() << endl;

        if (!io.headerOk())
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        // if (!exists(io.objectPath()))
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        {
            Info<< "Writing dummy " << regionName/io.name() << endl;
            dictionary dummyDict;
            dictionary divDict;
            dummyDict.add("divSchemes", divDict);
            dictionary gradDict;
            dummyDict.add("gradSchemes", gradDict);
            dictionary laplDict;
            dummyDict.add("laplacianSchemes", laplDict);

            IOdictionary(io, dummyDict).regIOobject::write();
        }
    }
    {
        IOobject io
        (
            "fvSolution",
            mesh.time().system(),
            regionName,
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            mesh,
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            IOobject::NO_READ,
            IOobject::NO_WRITE,
            false
        );

        if (!io.headerOk())
        //if (!exists(io.objectPath()))
        {
            Info<< "Writing dummy " << regionName/io.name() << endl;
            dictionary dummyDict;
            IOdictionary(io, dummyDict).regIOobject::write();
        }
    }


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    // Neighbour cellRegion.
    labelList coupledRegion(mesh.nFaces()-mesh.nInternalFaces());

    forAll(coupledRegion, i)
    {
        label cellI = mesh.faceOwner()[i+mesh.nInternalFaces()];
        coupledRegion[i] = cellRegion[cellI];
    }
    syncTools::swapBoundaryFaceList(mesh, coupledRegion, false);


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    // Topology change container. Start off from existing mesh.
    polyTopoChange meshMod(mesh);

    // Cell remover engine
    removeCells cellRemover(mesh);

    // Select all but region cells
    labelList cellsToRemove(getNonRegionCells(cellRegion, regionI));

    // Find out which faces will get exposed. Note that this
    // gets faces in mesh face order. So both regions will get same
    // face in same order (important!)
    labelList exposedFaces = cellRemover.getExposedFaces(cellsToRemove);

    labelList exposedPatchIDs(exposedFaces.size());
    forAll(exposedFaces, i)
    {
        label faceI = exposedFaces[i];

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        label ownRegion = cellRegion[mesh.faceOwner()[faceI]];
        label neiRegion = -1;

        if (mesh.isInternalFace(faceI))
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        {
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            neiRegion = cellRegion[mesh.faceNeighbour()[faceI]];
        }
        else
        {
            neiRegion = coupledRegion[faceI-mesh.nInternalFaces()];
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        }

        label otherRegion = -1;

        if (ownRegion == regionI && neiRegion != regionI)
        {
            otherRegion = neiRegion;
        }
        else if (ownRegion != regionI && neiRegion == regionI)
        {
            otherRegion = ownRegion;
        }
        else
        {
            FatalErrorIn("createRegionMesh(..)")
                << "Exposed face:" << faceI
                << " fc:" << mesh.faceCentres()[faceI]
                << " has owner region " << ownRegion
                << " and neighbour region " << neiRegion
                << " when handling region:" << regionI
                << exit(FatalError);
        }

        if (otherRegion != -1)
        {
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            edge interface(regionI, otherRegion);
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            // Find the patch.
            if (regionI < otherRegion)
            {
                exposedPatchIDs[i] = interfaceToPatch[interface];
            }
            else
            {
                exposedPatchIDs[i] = interfaceToPatch[interface]+1;
            }
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        }
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    }

    // Remove faces
    cellRemover.setRefinement
    (
        cellsToRemove,
        exposedFaces,
        exposedPatchIDs,
        meshMod
    );

    autoPtr<mapPolyMesh> map = meshMod.makeMesh
    (
        newMesh,
        IOobject
        (
            regionName,
            mesh.time().timeName(),
            mesh.time(),
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        mesh
    );

    return map;
}


void createAndWriteRegion
(
    const fvMesh& mesh,
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    const labelList& cellRegion,
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    const wordList& regionNames,
    const EdgeMap<label>& interfaceToPatch,
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    const label regionI,
    const word& newMeshInstance
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)
{
    Info<< "Creating mesh for region " << regionI
        << ' ' << regionNames[regionI] << endl;

    autoPtr<fvMesh> newMesh;
    autoPtr<mapPolyMesh> map = createRegionMesh
    (
        cellRegion,
        interfaceToPatch,
        mesh,
        regionI,
        regionNames[regionI],
        newMesh
    );

    Info<< "Mapping fields" << endl;

    // Map existing fields
    newMesh().updateMesh(map());

    // Add subsetted fields
    subsetVolFields<volScalarField>
    (
        mesh,
        newMesh(),
        map().cellMap(),
        map().faceMap()
    );
    subsetVolFields<volVectorField>
    (
        mesh,
        newMesh(),
        map().cellMap(),
        map().faceMap()
    );
    subsetVolFields<volSphericalTensorField>
    (
        mesh,
        newMesh(),
        map().cellMap(),
        map().faceMap()
    );
    subsetVolFields<volSymmTensorField>
    (
        mesh,
        newMesh(),
        map().cellMap(),
        map().faceMap()
    );
    subsetVolFields<volTensorField>
    (
        mesh,
        newMesh(),
        map().cellMap(),
        map().faceMap()
    );

    subsetSurfaceFields<surfaceScalarField>
    (
        mesh,
        newMesh(),
        map().faceMap()
    );
    subsetSurfaceFields<surfaceVectorField>
    (
        mesh,
        newMesh(),
        map().faceMap()
    );
    subsetSurfaceFields<surfaceSphericalTensorField>
    (
        mesh,
        newMesh(),
        map().faceMap()
    );
    subsetSurfaceFields<surfaceSymmTensorField>
    (
        mesh,
        newMesh(),
        map().faceMap()
    );
    subsetSurfaceFields<surfaceTensorField>
    (
        mesh,
        newMesh(),
        map().faceMap()
    );


    const polyBoundaryMesh& newPatches = newMesh().boundaryMesh();
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    newPatches.checkParallelSync(true);
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    // Delete empty patches
    // ~~~~~~~~~~~~~~~~~~~~

    // Create reordering list to move patches-to-be-deleted to end
    labelList oldToNew(newPatches.size(), -1);
    label newI = 0;

    Info<< "Deleting empty patches" << endl;

    // Assumes all non-proc boundaries are on all processors!
    forAll(newPatches, patchI)
    {
        const polyPatch& pp = newPatches[patchI];

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        if (!isA<processorPolyPatch>(pp))
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        {
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            if (returnReduce(pp.size(), sumOp<label>()) > 0)
            {
                oldToNew[patchI] = newI++;
            }
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        }
    }

    // Same for processor patches (but need no reduction)
    forAll(newPatches, patchI)
    {
        const polyPatch& pp = newPatches[patchI];

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        if (isA<processorPolyPatch>(pp) && pp.size())
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        {
            oldToNew[patchI] = newI++;
        }
    }

    const label nNewPatches = newI;

    // Move all deleteable patches to the end
    forAll(oldToNew, patchI)
    {
        if (oldToNew[patchI] == -1)
        {
            oldToNew[patchI] = newI++;
        }
    }

    reorderPatches(newMesh(), oldToNew, nNewPatches);


    Info<< "Writing new mesh" << endl;

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    newMesh().setInstance(newMeshInstance);
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    newMesh().write();

    // Write addressing files like decomposePar
    Info<< "Writing addressing to base mesh" << endl;

    labelIOList pointProcAddressing
    (
        IOobject
        (
            "pointRegionAddressing",
            newMesh().facesInstance(),
            newMesh().meshSubDir,
            newMesh(),
            IOobject::NO_READ,
            IOobject::NO_WRITE,
            false
        ),
        map().pointMap()
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