cyclicAMIPolyPatch.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2016-2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
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 "cyclicAMIPolyPatch.H"
#include "SubField.H"
#include "Time.H"
#include "unitConversion.H"
#include "OFstream.H"
#include "meshTools.H"
#include "addToRunTimeSelectionTable.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeNameAndDebug(cyclicAMIPolyPatch, 0);
 
    addToRunTimeSelectionTable(polyPatch, cyclicAMIPolyPatch, word);
    addToRunTimeSelectionTable(polyPatch, cyclicAMIPolyPatch, dictionary);
}
 
const Foam::scalar Foam::cyclicAMIPolyPatch::tolerance_ = 1e-10;
 
// * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
 
Foam::vector Foam::cyclicAMIPolyPatch::findFaceNormalMaxRadius
(
    const pointField& faceCentres
) const
{
    // Determine a face furthest away from the axis
 
    const vectorField n((faceCentres - rotationCentre_) ^ rotationAxis_);
 
    const scalarField magRadSqr(magSqr(n));
 
    label facei = findMax(magRadSqr);
 
    DebugInFunction
        << "Patch: " << name() << nl
        << "    rotFace  = " << facei << nl
        << "    point    = " << faceCentres[facei] << nl
        << "    distance = " << Foam::sqrt(magRadSqr[facei])
        << endl;
 
    return n[facei];
}
 
 
void Foam::cyclicAMIPolyPatch::calcTransforms
(
    const primitivePatch& half0,
    const pointField& half0Ctrs,
    const vectorField& half0Areas,
    const pointField& half1Ctrs,
    const vectorField& half1Areas
)
{
    if (transform() != neighbPatch().transform())
    {
        FatalErrorInFunction
            << "Patch " << name()
            << " has transform type " << transformTypeNames[transform()]
            << ", neighbour patch " << neighbPatchName()
            << " has transform type "
            << neighbPatch().transformTypeNames[neighbPatch().transform()]
            << exit(FatalError);
    }
 
 
    // Calculate transformation tensors
 
    switch (transform())
    {
        case ROTATIONAL:
        {
            tensor revT = Zero;
 
            if (rotationAngleDefined_)
            {
                const tensor T(rotationAxis_*rotationAxis_);
 
                const tensor S
                (
                    0, -rotationAxis_.z(), rotationAxis_.y(),
                    rotationAxis_.z(), 0, -rotationAxis_.x(),
                    -rotationAxis_.y(), rotationAxis_.x(), 0
                );
 
                const tensor revTPos
                (
                    T
                  + cos(rotationAngle_)*(tensor::I - T)
                  + sin(rotationAngle_)*S
                );
 
                const tensor revTNeg
                (
                    T
                  + cos(-rotationAngle_)*(tensor::I - T)
                  + sin(-rotationAngle_)*S
                );
 
                // Check - assume correct angle when difference in face areas
                // is the smallest
                const vector transformedAreaPos = gSum(half1Areas & revTPos);
                const vector transformedAreaNeg = gSum(half1Areas & revTNeg);
                const vector area0 = gSum(half0Areas);
                const scalar magArea0 = mag(area0) + ROOTVSMALL;
 
                // Areas have opposite sign, so sum should be zero when correct
                // rotation applied
                const scalar errorPos = mag(transformedAreaPos + area0);
                const scalar errorNeg = mag(transformedAreaNeg + area0);
 
                const scalar normErrorPos = errorPos/magArea0;
                const scalar normErrorNeg = errorNeg/magArea0;
 
                if (errorPos > errorNeg && normErrorNeg < matchTolerance())
                {
                    revT = revTNeg;
                    rotationAngle_ *= -1;
                }
                else
                {
                    revT = revTPos;
                }
 
                const scalar areaError = min(normErrorPos, normErrorNeg);
 
                if (areaError > matchTolerance())
                {
                    WarningInFunction
                        << "Patch areas are not consistent within "
                        << 100*matchTolerance()
                        << " % indicating a possible error in the specified "
                        << "angle of rotation" << nl
                        << "    owner patch     : " << name() << nl
                        << "    neighbour patch : " << neighbPatch().name()
                        << nl
                        << "    angle           : "
                        << radToDeg(rotationAngle_) << " deg" << nl
                        << "    area error      : " << 100*areaError << " %"
                        << "    match tolerance : " <<  matchTolerance()
                        << endl;
                }
 
                if (debug)
                {
                    scalar theta = radToDeg(rotationAngle_);
 
                    Pout<< "cyclicAMIPolyPatch::calcTransforms: patch:"
                        << name()
                        << " Specified rotation:"
                        << " swept angle: " << theta << " [deg]"
                        << " reverse transform: " << revT
                        << endl;
                }
            }
            else
            {
                point n0 = Zero;
                point n1 = Zero;
                if (half0Ctrs.size())
                {
                    n0 = findFaceNormalMaxRadius(half0Ctrs);
                }
                if (half1Ctrs.size())
                {
                    n1 = -findFaceNormalMaxRadius(half1Ctrs);
                }
 
                reduce(n0, maxMagSqrOp<point>());
                reduce(n1, maxMagSqrOp<point>());
 
                n0.normalise();
                n1.normalise();
 
                // Extended tensor from two local coordinate systems calculated
                // using normal and rotation axis
                const tensor E0
                (
                    rotationAxis_,
                    (n0 ^ rotationAxis_),
                    n0
                );
                const tensor E1
                (
                    rotationAxis_,
                    (-n1 ^ rotationAxis_),
                    -n1
                );
                revT = E1.T() & E0;
 
                if (debug)
                {
                    scalar theta = radToDeg(acos(-(n0 & n1)));
 
                    Pout<< "cyclicAMIPolyPatch::calcTransforms: patch:"
                        << name()
                        << " Specified rotation:"
                        << " n0:" << n0 << " n1:" << n1
                        << " swept angle: " << theta << " [deg]"
                        << " reverse transform: " << revT
                        << endl;
                }
            }
 
            const_cast<tensorField&>(forwardT()) = tensorField(1, revT.T());
            const_cast<tensorField&>(reverseT()) = tensorField(1, revT);
            const_cast<vectorField&>(separation()).setSize(0);
            const_cast<boolList&>(collocated()) = boolList(1, false);
 
            break;
        }
        case TRANSLATIONAL:
        {
            if (debug)
            {
                Pout<< "cyclicAMIPolyPatch::calcTransforms : patch:" << name()
                    << " Specified translation : " << separationVector_
                    << endl;
            }
 
            const_cast<tensorField&>(forwardT()).clear();
            const_cast<tensorField&>(reverseT()).clear();
            const_cast<vectorField&>(separation()) = vectorField
            (
                1,
                separationVector_
            );
            const_cast<boolList&>(collocated()) = boolList(1, false);
 
            break;
        }
        default:
        {
            if (debug)
            {
                Pout<< "patch:" << name()
                    << " Assuming cyclic AMI pairs are colocated" << endl;
            }
 
            const_cast<tensorField&>(forwardT()).clear();
            const_cast<tensorField&>(reverseT()).clear();
            const_cast<vectorField&>(separation()).setSize(0);
            const_cast<boolList&>(collocated()) = boolList(1, true);
 
            break;
        }
    }
 
    if (debug)
    {
        Pout<< "patch: " << name() << nl
            << "    forwardT = " << forwardT() << nl
            << "    reverseT = " << reverseT() << nl
            << "    separation = " << separation() << nl
            << "    collocated = " << collocated() << nl << endl;
    }
}
 
 
// * * * * * * * * * * * Protected Member Functions  * * * * * * * * * * * * //
 
const Foam::autoPtr<Foam::searchableSurface>&
Foam::cyclicAMIPolyPatch::surfPtr() const
{
    const word surfType(surfDict_.getOrDefault<word>("type", "none"));
 
    if (!surfPtr_ && owner() && surfType != "none")
    {
        word surfName(surfDict_.getOrDefault("name", name()));
 
        const polyMesh& mesh = boundaryMesh().mesh();
 
        surfPtr_ =
            searchableSurface::New
            (
                surfType,
                IOobject
                (
                    surfName,
                    mesh.time().constant(),
                    "triSurface",
                    mesh,
                    IOobject::MUST_READ,
                    IOobject::NO_WRITE
                ),
                surfDict_
            );
    }
 
    return surfPtr_;
}
 
 
void Foam::cyclicAMIPolyPatch::resetAMI() const
{
    resetAMI(boundaryMesh().mesh().points());
}
 
 
void Foam::cyclicAMIPolyPatch::resetAMI(const UList<point>& points) const
{
    DebugInFunction << endl;
 
    if (!owner())
    {
        return;
    }
 
    const cyclicAMIPolyPatch& nbr = neighbPatch();
    pointField srcPoints(localPoints());
    pointField nbrPoints(nbr.localPoints());
 
    if (debug)
    {
        const Time& t = boundaryMesh().mesh().time();
        OFstream os(t.path()/name() + "_neighbourPatch-org.obj");
        meshTools::writeOBJ(os, neighbPatch().localFaces(), nbrPoints);
    }
 
    label patchSize0 = size();
    label nbrPatchSize0 = nbr.size();
 
    if (createAMIFaces_)
    {
        // AMI is created based on the original patch faces (non-extended patch)
        if (srcFaceIDs_.size())
        {
            patchSize0 = srcFaceIDs_.size();
        }
        if (tgtFaceIDs_.size())
        {
            nbrPatchSize0 = tgtFaceIDs_.size();
        }
    }
 
    // Transform neighbour patch to local system
    transformPosition(nbrPoints);
    primitivePatch nbrPatch0
    (
        SubList<face>(nbr.localFaces(), nbrPatchSize0),
        nbrPoints
    );
    primitivePatch patch0
    (
        SubList<face>(localFaces(), patchSize0),
        srcPoints
    );
 
 
    if (debug)
    {
        const Time& t = boundaryMesh().mesh().time();
        OFstream osN(t.path()/name() + "_neighbourPatch-trans.obj");
        meshTools::writeOBJ(osN, nbrPatch0.localFaces(), nbrPoints);
 
        OFstream osO(t.path()/name() + "_ownerPatch.obj");
        meshTools::writeOBJ(osO, this->localFaces(), localPoints());
    }
 
    // Construct/apply AMI interpolation to determine addressing and weights
    AMIPtr_->upToDate() = false;
    AMIPtr_->calculate(patch0, nbrPatch0, surfPtr());
 
    if (debug)
    {
        AMIPtr_->checkSymmetricWeights(true);
    }
}
 
 
void Foam::cyclicAMIPolyPatch::calcTransforms()
{
    DebugInFunction << endl;
 
    const cyclicAMIPolyPatch& half0 = *this;
    vectorField half0Areas(half0.size());
    forAll(half0, facei)
    {
        half0Areas[facei] = half0[facei].areaNormal(half0.points());
    }
 
    const cyclicAMIPolyPatch& half1 = neighbPatch();
    vectorField half1Areas(half1.size());
    forAll(half1, facei)
    {
        half1Areas[facei] = half1[facei].areaNormal(half1.points());
    }
 
    calcTransforms
    (
        half0,
        half0.faceCentres(),
        half0Areas,
        half1.faceCentres(),
        half1Areas
    );
 
    DebugPout
        << "calcTransforms() : patch: " << name() << nl
        << "    forwardT = " << forwardT() << nl
        << "    reverseT = " << reverseT() << nl
        << "    separation = " << separation() << nl
        << "    collocated = " << collocated() << nl << endl;
}
 
 
void Foam::cyclicAMIPolyPatch::initGeometry(PstreamBuffers& pBufs)
{
    DebugInFunction << endl;
 
    // Flag AMI as needing update
    AMIPtr_->upToDate() = false;
 
    polyPatch::initGeometry(pBufs);
 
    // Early calculation of transforms so e.g. cyclicACMI can use them.
    // Note: also triggers primitiveMesh face centre. Note that cell
    // centres should -not- be calculated
    // since e.g. cyclicACMI overrides face areas
    calcTransforms();
}
 
 
void Foam::cyclicAMIPolyPatch::calcGeometry(PstreamBuffers& pBufs)
{
    DebugInFunction << endl;
}
 
 
void Foam::cyclicAMIPolyPatch::initMovePoints
(
    PstreamBuffers& pBufs,
    const pointField& p
)
{
    DebugInFunction << endl;
 
    // See below. Clear out any local geometry
    primitivePatch::movePoints(p);
 
    // Note: processorPolyPatch::initMovePoints calls
    // processorPolyPatch::initGeometry which will trigger calculation of
    // patch faceCentres() and cell volumes...
 
    if (createAMIFaces_)
    {
        // Note: AMI should have been updated in setTopology
 
        // faceAreas() and faceCentres() have been reset and will be
        // recalculated on-demand using the mesh points and no longer
        // correspond to the scaled areas!
        restoreScaledGeometry();
 
        // deltas need to be recalculated to use new face centres!
    }
    else
    {
        AMIPtr_->upToDate() = false;
    }
 
    // Early calculation of transforms. See above.
    calcTransforms();
}
 
 
void Foam::cyclicAMIPolyPatch::movePoints
(
    PstreamBuffers& pBufs,
    const pointField& p
)
{
    DebugInFunction << endl;
 
//    Note: not calling movePoints since this will undo our manipulations!
//    polyPatch::movePoints(pBufs, p);
/*
    polyPatch::movePoints
     -> primitivePatch::movePoints
        -> primitivePatch::clearGeom:
    deleteDemandDrivenData(localPointsPtr_);
    deleteDemandDrivenData(faceCentresPtr_);
    deleteDemandDrivenData(faceAreasPtr_);
    deleteDemandDrivenData(magFaceAreasPtr_);
    deleteDemandDrivenData(faceNormalsPtr_);
    deleteDemandDrivenData(pointNormalsPtr_);
*/
}
 
 
void Foam::cyclicAMIPolyPatch::initUpdateMesh(PstreamBuffers& pBufs)
{
    DebugInFunction << endl;
 
    polyPatch::initUpdateMesh(pBufs);
 
    if (createAMIFaces_ && boundaryMesh().mesh().topoChanging() && owner())
    {
        setAMIFaces();
    }
}
 
 
void Foam::cyclicAMIPolyPatch::updateMesh(PstreamBuffers& pBufs)
{
    DebugInFunction << endl;
 
    // Note: this clears out cellCentres(), faceCentres() and faceAreas()
    polyPatch::updateMesh(pBufs);
}
 
 
void Foam::cyclicAMIPolyPatch::clearGeom()
{
    DebugInFunction << endl;
 
    if (!updatingAMI_)
    {
        AMIPtr_->upToDate() = false;
    }
 
    polyPatch::clearGeom();
}
 
 
// * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * * * //
 
Foam::cyclicAMIPolyPatch::cyclicAMIPolyPatch
(
    const word& name,
    const label size,
    const label start,
    const label index,
    const polyBoundaryMesh& bm,
    const word& patchType,
    const transformType transform,
    const word& defaultAMIMethod
)
:
    coupledPolyPatch(name, size, start, index, bm, patchType, transform),
    nbrPatchName_(word::null),
    nbrPatchID_(-1),
    fraction_(Zero),
    rotationAxis_(Zero),
    rotationCentre_(Zero),
    rotationAngleDefined_(false),
    rotationAngle_(0.0),
    separationVector_(Zero),
    AMIPtr_(AMIInterpolation::New(defaultAMIMethod)),
    surfDict_(fileName("surface")),
    surfPtr_(nullptr),
    createAMIFaces_(false),
    moveFaceCentres_(false),
    updatingAMI_(true),
    srcFaceIDs_(),
    tgtFaceIDs_(),
    faceAreas0_(),
    faceCentres0_()
{
    // Neighbour patch might not be valid yet so no transformation
    // calculation possible
}
 
 
Foam::cyclicAMIPolyPatch::cyclicAMIPolyPatch
(
    const word& name,
    const dictionary& dict,
    const label index,
    const polyBoundaryMesh& bm,
    const word& patchType,
    const word& defaultAMIMethod
)
:
    coupledPolyPatch(name, dict, index, bm, patchType),
    nbrPatchName_(dict.getOrDefault<word>("neighbourPatch", word::null)),
    coupleGroup_(dict),
    nbrPatchID_(-1),
    fraction_(dict.getOrDefault<scalar>("fraction", Zero)),
    rotationAxis_(Zero),
    rotationCentre_(Zero),
    rotationAngleDefined_(false),
    rotationAngle_(0.0),
    separationVector_(Zero),
    AMIPtr_
    (
        AMIInterpolation::New
        (
            dict.getOrDefault<word>("AMIMethod", defaultAMIMethod),
            dict,
            dict.getOrDefault("flipNormals", false)
        )
    ),
    surfDict_(dict.subOrEmptyDict("surface")),
    surfPtr_(nullptr),
    createAMIFaces_(dict.getOrDefault("createAMIFaces", false)),
    moveFaceCentres_(false),
    updatingAMI_(true),
    srcFaceIDs_(),
    tgtFaceIDs_(),
    faceAreas0_(),
    faceCentres0_()
{
    if (nbrPatchName_ == word::null && !coupleGroup_.valid())
    {
        FatalIOErrorInFunction(dict)
            << "No \"neighbourPatch\" or \"coupleGroup\" provided."
            << exit(FatalIOError);
    }
 
    if (nbrPatchName_ == name)
    {
        FatalIOErrorInFunction(dict)
            << "Neighbour patch name " << nbrPatchName_
            << " cannot be the same as this patch " << name
            << exit(FatalIOError);
    }
 
    switch (transform())
    {
        case ROTATIONAL:
        {
            dict.readEntry("rotationAxis", rotationAxis_);
            dict.readEntry("rotationCentre", rotationCentre_);
            if (dict.readIfPresent("rotationAngle", rotationAngle_))
            {
                rotationAngleDefined_ = true;
                rotationAngle_ = degToRad(rotationAngle_);
 
                if (debug)
                {
                    Info<< "rotationAngle: " << rotationAngle_ << " [rad]"
                        <<  endl;
                }
            }
 
            scalar magRot = mag(rotationAxis_);
            if (magRot < SMALL)
            {
                FatalIOErrorInFunction(dict)
                    << "Illegal rotationAxis " << rotationAxis_ << endl
                    << "Please supply a non-zero vector."
                    << exit(FatalIOError);
            }
            rotationAxis_ /= magRot;
 
            break;
        }
        case TRANSLATIONAL:
        {
            dict.readEntry("separationVector", separationVector_);
            break;
        }
        default:
        {
            // No additional info required
        }
    }
 
    // Neighbour patch might not be valid yet so no transformation
    // calculation possible
 
    // If topology change, recover the sizes of the original patches and
    // read additional controls
    if (createAMIFaces_)
    {
        srcFaceIDs_.setSize(dict.get<label>("srcSize"));
        tgtFaceIDs_.setSize(dict.get<label>("tgtSize"));
        moveFaceCentres_ = dict.getOrDefault("moveFaceCentres", true);
    }
}
 
 
Foam::cyclicAMIPolyPatch::cyclicAMIPolyPatch
(
    const cyclicAMIPolyPatch& pp,
    const polyBoundaryMesh& bm
)
:
    coupledPolyPatch(pp, bm),
    nbrPatchName_(pp.nbrPatchName_),
    coupleGroup_(pp.coupleGroup_),
    nbrPatchID_(-1),
    fraction_(pp.fraction_),
    rotationAxis_(pp.rotationAxis_),
    rotationCentre_(pp.rotationCentre_),
    rotationAngleDefined_(pp.rotationAngleDefined_),
    rotationAngle_(pp.rotationAngle_),
    separationVector_(pp.separationVector_),
    AMIPtr_(pp.AMIPtr_->clone()),
    surfDict_(pp.surfDict_),
    surfPtr_(nullptr),
    createAMIFaces_(pp.createAMIFaces_),
    moveFaceCentres_(pp.moveFaceCentres_),
    updatingAMI_(true),
    srcFaceIDs_(),
    tgtFaceIDs_(),
    faceAreas0_(),
    faceCentres0_()
{
    // Neighbour patch might not be valid yet so no transformation
    // calculation possible
}
 
 
Foam::cyclicAMIPolyPatch::cyclicAMIPolyPatch
(
    const cyclicAMIPolyPatch& pp,
    const polyBoundaryMesh& bm,
    const label index,
    const label newSize,
    const label newStart,
    const word& nbrPatchName
)
:
    coupledPolyPatch(pp, bm, index, newSize, newStart),
    nbrPatchName_(nbrPatchName),
    coupleGroup_(pp.coupleGroup_),
    nbrPatchID_(-1),
    fraction_(pp.fraction_),
    rotationAxis_(pp.rotationAxis_),
    rotationCentre_(pp.rotationCentre_),
    rotationAngleDefined_(pp.rotationAngleDefined_),
    rotationAngle_(pp.rotationAngle_),
    separationVector_(pp.separationVector_),
    AMIPtr_(pp.AMIPtr_->clone()),
    surfDict_(pp.surfDict_),
    surfPtr_(nullptr),
    createAMIFaces_(pp.createAMIFaces_),
    moveFaceCentres_(pp.moveFaceCentres_),
    updatingAMI_(true),
    srcFaceIDs_(),
    tgtFaceIDs_(),
    faceAreas0_(),
    faceCentres0_()
{
    if (nbrPatchName_ == name())
    {
        FatalErrorInFunction
            << "Neighbour patch name " << nbrPatchName_
            << " cannot be the same as this patch " << name()
            << exit(FatalError);
    }
 
    // Neighbour patch might not be valid yet so no transformation
    // calculation possible
}
 
 
Foam::cyclicAMIPolyPatch::cyclicAMIPolyPatch
(
    const cyclicAMIPolyPatch& pp,
    const polyBoundaryMesh& bm,
    const label index,
    const labelUList& mapAddressing,
    const label newStart
)
:
    coupledPolyPatch(pp, bm, index, mapAddressing, newStart),
    nbrPatchName_(pp.nbrPatchName_),
    coupleGroup_(pp.coupleGroup_),
    nbrPatchID_(-1),
    fraction_(pp.fraction_),
    rotationAxis_(pp.rotationAxis_),
    rotationCentre_(pp.rotationCentre_),
    rotationAngleDefined_(pp.rotationAngleDefined_),
    rotationAngle_(pp.rotationAngle_),
    separationVector_(pp.separationVector_),
    AMIPtr_(pp.AMIPtr_->clone()),
    surfDict_(pp.surfDict_),
    surfPtr_(nullptr),
    createAMIFaces_(pp.createAMIFaces_),
    moveFaceCentres_(pp.moveFaceCentres_),
    updatingAMI_(true),
    srcFaceIDs_(),
    tgtFaceIDs_(),
    faceAreas0_(),
    faceCentres0_()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
Foam::label Foam::cyclicAMIPolyPatch::neighbPatchID() const
{
    if (nbrPatchID_ == -1)
    {
        nbrPatchID_ = this->boundaryMesh().findPatchID(neighbPatchName());
 
        if (nbrPatchID_ == -1)
        {
            FatalErrorInFunction
                << "Illegal neighbourPatch name " << neighbPatchName()
                << nl << "Valid patch names are "
                << this->boundaryMesh().names()
                << exit(FatalError);
        }
 
        // Check that it is a cyclic AMI patch
        const cyclicAMIPolyPatch& nbrPatch =
            refCast<const cyclicAMIPolyPatch>
            (
                this->boundaryMesh()[nbrPatchID_]
            );
 
        if (nbrPatch.neighbPatchName() != name())
        {
            WarningInFunction
                << "Patch " << name()
                << " specifies neighbour patch " << neighbPatchName()
                << nl << " but that in return specifies "
                << nbrPatch.neighbPatchName() << endl;
        }
    }
 
    return nbrPatchID_;
}
 
 
bool Foam::cyclicAMIPolyPatch::owner() const
{
    return index() < neighbPatchID();
}
 
 
const Foam::cyclicAMIPolyPatch& Foam::cyclicAMIPolyPatch::neighbPatch() const
{
    const polyPatch& pp = this->boundaryMesh()[neighbPatchID()];
    return refCast<const cyclicAMIPolyPatch>(pp);
}
 
 
const Foam::AMIPatchToPatchInterpolation& Foam::cyclicAMIPolyPatch::AMI() const
{
    if (!owner())
    {
        FatalErrorInFunction
            << "AMI interpolator only available to owner patch"
            << abort(FatalError);
    }
 
    if (!AMIPtr_->upToDate())
    {
        resetAMI();
    }
 
    return *AMIPtr_;
}
 
 
bool Foam::cyclicAMIPolyPatch::applyLowWeightCorrection() const
{
    if (owner())
    {
        return AMI().applyLowWeightCorrection();
    }
    else
    {
        return neighbPatch().AMI().applyLowWeightCorrection();
    }
}
 
 
void Foam::cyclicAMIPolyPatch::transformPosition(pointField& l) const
{
    if (!parallel())
    {
        if (transform() == ROTATIONAL)
        {
            l = Foam::transform(forwardT(), l - rotationCentre_)
              + rotationCentre_;
        }
        else
        {
            l = Foam::transform(forwardT(), l);
        }
    }
    else if (separated())
    {
        // transformPosition gets called on the receiving side,
        // separation gets calculated on the sending side so subtract
 
        const vectorField& s = separation();
        if (s.size() == 1)
        {
            forAll(l, i)
            {
                l[i] -= s[0];
            }
        }
        else
        {
            l -= s;
        }
    }
}
 
 
void Foam::cyclicAMIPolyPatch::transformPosition
(
    point& l,
    const label facei
) const
{
    if (!parallel())
    {
        const tensor& T =
        (
            forwardT().size() == 1
          ? forwardT()[0]
          : forwardT()[facei]
        );
 
        if (transform() == ROTATIONAL)
        {
            l = Foam::transform(T, l - rotationCentre_) + rotationCentre_;
        }
        else
        {
            l = Foam::transform(T, l);
        }
    }
    else if (separated())
    {
        const vector& s =
        (
            separation().size() == 1
          ? separation()[0]
          : separation()[facei]
        );
 
        l -= s;
    }
}
 
 
void Foam::cyclicAMIPolyPatch::reverseTransformPosition
(
    point& l,
    const label facei
) const
{
    if (!parallel())
    {
        const tensor& T =
        (
            reverseT().size() == 1
          ? reverseT()[0]
          : reverseT()[facei]
        );
 
        if (transform() == ROTATIONAL)
        {
            l = Foam::transform(T, l - rotationCentre_) + rotationCentre_;
        }
        else
        {
            l = Foam::transform(T, l);
        }
    }
    else if (separated())
    {
        const vector& s =
        (
            separation().size() == 1
          ? separation()[0]
          : separation()[facei]
        );
 
        l += s;
    }
}
 
 
void Foam::cyclicAMIPolyPatch::reverseTransformDirection
(
    vector& d,
    const label facei
) const
{
    if (!parallel())
    {
        const tensor& T =
        (
            reverseT().size() == 1
          ? reverseT()[0]
          : reverseT()[facei]
        );
 
        d = Foam::transform(T, d);
    }
}
 
 
void Foam::cyclicAMIPolyPatch::calcGeometry
(
    const primitivePatch& referPatch,
    const pointField& thisCtrs,
    const vectorField& thisAreas,
    const pointField& thisCc,
    const pointField& nbrCtrs,
    const vectorField& nbrAreas,
    const pointField& nbrCc
)
{}
 
 
void Foam::cyclicAMIPolyPatch::initOrder
(
    PstreamBuffers& pBufs,
    const primitivePatch& pp
) const
{}
 
 
bool Foam::cyclicAMIPolyPatch::order
(
    PstreamBuffers& pBufs,
    const primitivePatch& pp,
    labelList& faceMap,
    labelList& rotation
) const
{
    faceMap.setSize(pp.size());
    faceMap = -1;
 
    rotation.setSize(pp.size());
    rotation = 0;
 
    return false;
}
 
 
Foam::label Foam::cyclicAMIPolyPatch::pointFace
(
    const label facei,
    const vector& n,
    point& p
) const
{
    point prt(p);
    reverseTransformPosition(prt, facei);
 
    vector nrt(n);
    reverseTransformDirection(nrt, facei);
 
    label nbrFacei = -1;
 
    if (owner())
    {
        nbrFacei = AMI().tgtPointFace
        (
            *this,
            neighbPatch(),
            nrt,
            facei,
            prt
        );
    }
    else
    {
        nbrFacei = neighbPatch().AMI().srcPointFace
        (
            neighbPatch(),
            *this,
            nrt,
            facei,
            prt
        );
    }
 
    if (nbrFacei >= 0)
    {
        p = prt;
    }
 
    return nbrFacei;
}
 
 
void Foam::cyclicAMIPolyPatch::write(Ostream& os) const
{
    coupledPolyPatch::write(os);
    if (!nbrPatchName_.empty())
    {
        os.writeEntry("neighbourPatch", nbrPatchName_);
    }
    coupleGroup_.write(os);
 
    switch (transform())
    {
        case ROTATIONAL:
        {
            os.writeEntry("rotationAxis", rotationAxis_);
            os.writeEntry("rotationCentre", rotationCentre_);
 
            if (rotationAngleDefined_)
            {
                os.writeEntry("rotationAngle", radToDeg(rotationAngle_));
            }
 
            break;
        }
        case TRANSLATIONAL:
        {
            os.writeEntry("separationVector", separationVector_);
            break;
        }
        case NOORDERING:
        {
            break;
        }
        default:
        {
            // No additional info to write
        }
    }
 
    AMIPtr_->write(os);
 
    if (!surfDict_.empty())
    {
        surfDict_.writeEntry(surfDict_.dictName(), os);
    }
 
    if (createAMIFaces_)
    {
        os.writeEntry("createAMIFaces", createAMIFaces_);
        os.writeEntry("srcSize", srcFaceIDs_.size());
        os.writeEntry("tgtSize", tgtFaceIDs_.size());
        os.writeEntry("moveFaceCentres", moveFaceCentres_);
    }
 
    os.writeEntryIfDifferent<scalar>("fraction", Zero, fraction_);
}
 
 
// ************************************************************************* //