PointEdgeWave.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2017 OpenFOAM Foundation
    Copyright (C) 2021-2023 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
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#include "PointEdgeWave.H"
#include "polyMesh.H"
#include "processorPolyPatch.H"
#include "cyclicPolyPatch.H"
#include "UIPstream.H"
#include "UOPstream.H"
#include "debug.H"
#include "typeInfo.H"
#include "globalMeshData.H"
#include "pointFields.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
    //- Reduction class. If x and y are not equal assign value.
    template<class Type, class TrackingData>
    class combineEqOp
    {
        TrackingData& td_;

    public:

        combineEqOp(TrackingData& td)
        :
            td_(td)
        {}

        void operator()(Type& x, const Type& y) const
        {
            if (!x.valid(td_) && y.valid(td_))
            {
                x = y;
            }
        }
    };
}


// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //

// Handle leaving domain. Implementation referred to Type
template<class Type, class TrackingData>
void Foam::PointEdgeWave<Type, TrackingData>::leaveDomain
(
    const polyPatch& patch,
    const labelList& patchPointLabels,
    List<Type>& pointInfo
) const
{
    const labelList& meshPoints = patch.meshPoints();

    forAll(patchPointLabels, i)
    {
        label patchPointi = patchPointLabels[i];

        const point& pt = patch.points()[meshPoints[patchPointi]];

        pointInfo[i].leaveDomain(patch, patchPointi, pt, td_);
    }
}


// Handle entering domain. Implementation referred to Type
template<class Type, class TrackingData>
void Foam::PointEdgeWave<Type, TrackingData>::enterDomain
(
    const polyPatch& patch,
    const labelList& patchPointLabels,
    List<Type>& pointInfo
) const
{
    const labelList& meshPoints = patch.meshPoints();

    forAll(patchPointLabels, i)
    {
        label patchPointi = patchPointLabels[i];

        const point& pt = patch.points()[meshPoints[patchPointi]];

        pointInfo[i].enterDomain(patch, patchPointi, pt, td_);
    }
}


// Transform. Implementation referred to Type
template<class Type, class TrackingData>
void Foam::PointEdgeWave<Type, TrackingData>::transform
(
    const polyPatch& patch,
    const tensorField& rotTensor,
    List<Type>& pointInfo
) const
{
    if (rotTensor.size() == 1)
    {
        const tensor& T = rotTensor[0];

        forAll(pointInfo, i)
        {
            pointInfo[i].transform(T, td_);
        }
    }
    else
    {
        FatalErrorInFunction
            << "Non-uniform transformation on patch " << patch.name()
            << " of type " << patch.type()
            << " not supported for point fields"
            << abort(FatalError);

        forAll(pointInfo, i)
        {
            pointInfo[i].transform(rotTensor[i], td_);
        }
    }
}


// Update info for pointi, at position pt, with information from
// neighbouring edge.
// Updates:
//      - changedPoint_, changedPoints_,
//      - statistics: nEvals_, nUnvisitedPoints_
template<class Type, class TrackingData>
bool Foam::PointEdgeWave<Type, TrackingData>::updatePoint
(
    const label pointi,
    const label neighbourEdgeI,
    const Type& neighbourInfo,
    Type& pointInfo
)
{
    nEvals_++;

    bool wasValid = pointInfo.valid(td_);

    bool propagate =
        pointInfo.updatePoint
        (
            mesh_,
            pointi,
            neighbourEdgeI,
            neighbourInfo,
            propagationTol_,
            td_
        );

    if (propagate)
    {
        if (changedPoint_.set(pointi))
        {
            changedPoints_.push_back(pointi);
        }
    }

    if (!wasValid && pointInfo.valid(td_))
    {
        --nUnvisitedPoints_;
    }

    return propagate;
}


// Update info for pointi, at position pt, with information from
// same point.
// Updates:
//      - changedPoint_, changedPoints_,
//      - statistics: nEvals_, nUnvisitedPoints_
template<class Type, class TrackingData>
bool Foam::PointEdgeWave<Type, TrackingData>::updatePoint
(
    const label pointi,
    const Type& neighbourInfo,
    Type& pointInfo
)
{
    nEvals_++;

    bool wasValid = pointInfo.valid(td_);

    bool propagate =
        pointInfo.updatePoint
        (
            mesh_,
            pointi,
            neighbourInfo,
            propagationTol_,
            td_
        );

    if (propagate)
    {
        if (changedPoint_.set(pointi))
        {
            changedPoints_.push_back(pointi);
        }
    }

    if (!wasValid && pointInfo.valid(td_))
    {
        --nUnvisitedPoints_;
    }

    return propagate;
}


// Update info for edgei, at position pt, with information from
// neighbouring point.
// Updates:
//      - changedEdge_, changedEdges_,
//      - statistics: nEvals_, nUnvisitedEdge_
template<class Type, class TrackingData>
bool Foam::PointEdgeWave<Type, TrackingData>::updateEdge
(
    const label edgei,
    const label neighbourPointi,
    const Type& neighbourInfo,
    Type& edgeInfo
)
{
    nEvals_++;

    bool wasValid = edgeInfo.valid(td_);

    bool propagate =
        edgeInfo.updateEdge
        (
            mesh_,
            edgei,
            neighbourPointi,
            neighbourInfo,
            propagationTol_,
            td_
        );

    if (propagate)
    {
        if (changedEdge_.set(edgei))
        {
            changedEdges_.push_back(edgei);
        }
    }

    if (!wasValid && edgeInfo.valid(td_))
    {
        --nUnvisitedEdges_;
    }

    return propagate;
}


// Check if patches of given type name are present
template<class Type, class TrackingData>
template<class PatchType>
Foam::label Foam::PointEdgeWave<Type, TrackingData>::countPatchType() const
{
    label nPatches = 0;

    for (const polyPatch& p : mesh_.boundaryMesh())
    {
        if (isA<PatchType>(p))
        {
            ++nPatches;
        }
    }
    return nPatches;
}


// Transfer all the information to/from neighbouring processors
template<class Type, class TrackingData>
void Foam::PointEdgeWave<Type, TrackingData>::handleProcPatches()
{
    // 1. Send all point info on processor patches.

    const globalMeshData& pData = mesh_.globalData();

    // Which patches are processor patches
    const labelList& procPatches = pData.processorPatches();

    // Which processors this processor is connected to
    const labelList& neighbourProcs = pData.topology().procNeighbours();

    // Reset buffers
    pBufs_.clear();

    DynamicList<Type> patchInfo;
    DynamicList<label> thisPoints;
    DynamicList<label> nbrPoints;


    // Reduce communication by only sending non-zero data,
    // but with multiply-connected processor/processor
    // (eg, processorCyclic) also need to send zero information
    // to keep things synchronised

    // If data needs to be sent (index corresponding to neighbourProcs)
    List<bool> isActiveSend(neighbourProcs.size(), false);

    for (const label patchi : procPatches)
    {
        const auto& procPatch =
            refCast<const processorPolyPatch>(mesh_.boundaryMesh()[patchi]);

        const label nbrProci = procPatch.neighbProcNo();

        patchInfo.clear();
        patchInfo.reserve(procPatch.nPoints());

        thisPoints.clear();
        thisPoints.reserve(procPatch.nPoints());

        nbrPoints.clear();
        nbrPoints.reserve(procPatch.nPoints());

        // Get all changed points in reverse order
        const labelList& neighbPoints = procPatch.neighbPoints();
        forAll(neighbPoints, thisPointi)
        {
            label meshPointi = procPatch.meshPoints()[thisPointi];
            if (changedPoint_.test(meshPointi))
            {
                patchInfo.append(allPointInfo_[meshPointi]);
                thisPoints.append(thisPointi);
                nbrPoints.append(neighbPoints[thisPointi]);
            }
        }

        // Adapt for leaving domain
        leaveDomain(procPatch, thisPoints, patchInfo);

        // Record if send is required (non-empty data)
        if (!patchInfo.empty())
        {
            const label nbrIndex = neighbourProcs.find(nbrProci);
            if (nbrIndex >= 0)  // Safety check (should be unnecessary)
            {
                isActiveSend[nbrIndex] = true;
            }
        }

        // Send to neighbour
        {
            UOPstream toNbr(nbrProci, pBufs_);
            toNbr << nbrPoints << patchInfo;

            //if (debug & 2)
            //{
            //    Pout<< "Processor patch " << patchi << ' ' << procPatch.name()
            //        << "  send:" << patchInfo.size()
            //        << " to proc:" << nbrProci << endl;
            //}
        }
    }

    // Eliminate unnecessary sends
    forAll(neighbourProcs, nbrIndex)
    {
        if (!isActiveSend[nbrIndex])
        {
            pBufs_.clearSend(neighbourProcs[nbrIndex]);
        }
    }

    // Limit exchange to involved procs
    pBufs_.finishedNeighbourSends(neighbourProcs);


    //
    // 2. Receive all point info on processor patches.
    //

    for (const label patchi : procPatches)
    {
        const auto& procPatch =
            refCast<const processorPolyPatch>(mesh_.boundaryMesh()[patchi]);

        const label nbrProci = procPatch.neighbProcNo();

        if (!pBufs_.recvDataCount(nbrProci))
        {
            // Nothing to receive
            continue;
        }

        labelList patchPoints;
        List<Type> patchInfo;
        {
            UIPstream is(nbrProci, pBufs_);
            is >> patchPoints >> patchInfo;
        }

        //if (debug & 2)
        //{
        //    Pout<< "Processor patch " << patchi << ' ' << procPatch.name()
        //        << "  recv:" << patchInfo.size() << " from proc:"
        //        << nbrProci << endl;
        //}

        // Apply transform to received data for non-parallel planes
        if (!procPatch.parallel())
        {
            transform(procPatch, procPatch.forwardT(), patchInfo);
        }

        // Adapt for entering domain
        enterDomain(procPatch, patchPoints, patchInfo);

        // Merge received info
        const labelList& meshPoints = procPatch.meshPoints();
        forAll(patchInfo, i)
        {
            label meshPointi = meshPoints[patchPoints[i]];

            if (!allPointInfo_[meshPointi].equal(patchInfo[i], td_))
            {
                updatePoint
                (
                    meshPointi,
                    patchInfo[i],
                    allPointInfo_[meshPointi]
                );
            }
        }
    }

    // Collocated points should be handled by face based transfer
    // (since that is how connectivity is worked out)
    // They are also explicitly equalised in handleCollocatedPoints to
    // guarantee identical values.
}


template<class Type, class TrackingData>
void Foam::PointEdgeWave<Type, TrackingData>::handleCyclicPatches()
{
    // 1. Send all point info on cyclic patches.

    DynamicList<Type> nbrInfo;
    DynamicList<label> nbrPoints;
    DynamicList<label> thisPoints;

    for (const polyPatch& patch : mesh_.boundaryMesh())
    {
        const cyclicPolyPatch* cpp = isA<cyclicPolyPatch>(patch);

        if (cpp)
        {
            const auto& cycPatch = *cpp;
            const auto& nbrPatch = cycPatch.neighbPatch();

            nbrInfo.clear();
            nbrInfo.reserve(cycPatch.nPoints());
            nbrPoints.clear();
            nbrPoints.reserve(cycPatch.nPoints());
            thisPoints.clear();
            thisPoints.reserve(cycPatch.nPoints());

            // Collect nbrPatch points that have changed
            {
                const edgeList& pairs = cycPatch.coupledPoints();
                const labelList& meshPoints = nbrPatch.meshPoints();

                forAll(pairs, pairI)
                {
                    label thisPointi = pairs[pairI][0];
                    label nbrPointi = pairs[pairI][1];
                    label meshPointi = meshPoints[nbrPointi];

                    if (changedPoint_.test(meshPointi))
                    {
                        nbrInfo.append(allPointInfo_[meshPointi]);
                        nbrPoints.append(nbrPointi);
                        thisPoints.append(thisPointi);
                    }
                }

                // nbr : adapt for leaving domain
                leaveDomain(nbrPatch, nbrPoints, nbrInfo);
            }


            // Apply rotation for non-parallel planes

            if (!cycPatch.parallel())
            {
                // received data from half1
                transform(cycPatch, cycPatch.forwardT(), nbrInfo);
            }

            //if (debug)
            //{
            //    Pout<< "Cyclic patch " << patch.index() << ' ' << patch.name()
            //        << "  Changed : " << nbrInfo.size()
            //        << endl;
            //}

            // Adapt for entering domain
            enterDomain(cycPatch, thisPoints, nbrInfo);

            // Merge received info
            const labelList& meshPoints = cycPatch.meshPoints();
            forAll(nbrInfo, i)
            {
                label meshPointi = meshPoints[thisPoints[i]];

                if (!allPointInfo_[meshPointi].equal(nbrInfo[i], td_))
                {
                    updatePoint
                    (
                        meshPointi,
                        nbrInfo[i],
                        allPointInfo_[meshPointi]
                    );
                }
            }
        }
    }
}


// Guarantee collocated points have same information.
// Return number of points changed.
template<class Type, class TrackingData>
Foam::label Foam::PointEdgeWave<Type, TrackingData>::handleCollocatedPoints()
{
    // Transfer onto coupled patch
    const globalMeshData& gmd = mesh_.globalData();
    const indirectPrimitivePatch& cpp = gmd.coupledPatch();
    const labelList& meshPoints = cpp.meshPoints();

    const mapDistribute& slavesMap = gmd.globalPointSlavesMap();
    const labelListList& slaves = gmd.globalPointSlaves();

    List<Type> elems(slavesMap.constructSize());
    forAll(meshPoints, pointi)
    {
        elems[pointi] = allPointInfo_[meshPoints[pointi]];
    }

    // Pull slave data onto master (which might or might not have any
    // initialised points). No need to update transformed slots.
    slavesMap.distribute(elems, false);

    // Combine master data with slave data
    combineEqOp<Type, TrackingData> cop(td_);

    forAll(slaves, pointi)
    {
        Type& elem = elems[pointi];

        const labelList& slavePoints = slaves[pointi];

        // Combine master with untransformed slave data
        forAll(slavePoints, j)
        {
            cop(elem, elems[slavePoints[j]]);
        }

        // Copy result back to slave slots
        forAll(slavePoints, j)
        {
            elems[slavePoints[j]] = elem;
        }
    }

    // Push slave-slot data back to slaves
    slavesMap.reverseDistribute(elems.size(), elems, false);

    // Extract back onto mesh
    forAll(meshPoints, pointi)
    {
        if (elems[pointi].valid(td_))
        {
            label meshPointi = meshPoints[pointi];

            Type& elem = allPointInfo_[meshPointi];

            bool wasValid = elem.valid(td_);

            // Like updatePoint but bypass Type::updatePoint with its tolerance
            // checking
            //if (!elem.valid(td_) || !elem.equal(elems[pointi], td_))
            if (!elem.equal(elems[pointi], td_))
            {
                nEvals_++;
                elem = elems[pointi];

                // See if element now valid
                if (!wasValid && elem.valid(td_))
                {
                    --nUnvisitedPoints_;
                }

                // Update database of changed points
                if (changedPoint_.set(meshPointi))
                {
                    changedPoints_.push_back(meshPointi);
                }
            }
        }
    }

    // Sum changedPoints over all procs
    return returnReduce(nChangedPoints(), sumOp<label>());
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

// Iterate, propagating changedPointsInfo across mesh, until no change (or
// maxIter reached). Initial point values specified.
template<class Type, class TrackingData>
Foam::PointEdgeWave<Type, TrackingData>::PointEdgeWave
(
    const polyMesh& mesh,
    const labelList& changedPoints,
    const List<Type>& changedPointsInfo,

    UList<Type>& allPointInfo,
    UList<Type>& allEdgeInfo,

    const label maxIter,
    TrackingData& td
)
:
    PointEdgeWaveBase(mesh),

    allPointInfo_(allPointInfo),
    allEdgeInfo_(allEdgeInfo),
    td_(td),
    nCyclicPatches_(countPatchType<cyclicPolyPatch>()),
    nEvals_(0)
{
    if (allPointInfo_.size() != mesh_.nPoints())
    {
        FatalErrorInFunction
            << "size of pointInfo work array is not equal to the number"
            << " of points in the mesh" << endl
            << "    pointInfo   :" << allPointInfo_.size() << endl
            << "    mesh.nPoints:" << mesh_.nPoints()
            << exit(FatalError);
    }
    if (allEdgeInfo_.size() != mesh_.nEdges())
    {
        FatalErrorInFunction
            << "size of edgeInfo work array is not equal to the number"
            << " of edges in the mesh" << endl
            << "    edgeInfo   :" << allEdgeInfo_.size() << endl
            << "    mesh.nEdges:" << mesh_.nEdges()
            << exit(FatalError);
    }


    // Set from initial changed points data
    setPointInfo(changedPoints, changedPointsInfo);

    if (debug)
    {
        Info<< typeName << ": Seed points               : "
            << returnReduce(nChangedPoints(), sumOp<label>()) << endl;
    }

    // Iterate until nothing changes
    label iter = iterate(maxIter);

    if ((maxIter > 0) && (iter >= maxIter))
    {
        FatalErrorInFunction
            << "Maximum number of iterations reached. Increase maxIter." << endl
            << "    maxIter:" << maxIter << nl
            << "    nChangedPoints:" << nChangedPoints() << nl
            << "    nChangedEdges:" << nChangedEdges() << endl
            << exit(FatalError);
    }
}


template<class Type, class TrackingData>
Foam::PointEdgeWave<Type, TrackingData>::PointEdgeWave
(
    const polyMesh& mesh,
    UList<Type>& allPointInfo,
    UList<Type>& allEdgeInfo,
    TrackingData& td
)
:
    PointEdgeWaveBase(mesh),

    allPointInfo_(allPointInfo),
    allEdgeInfo_(allEdgeInfo),
    td_(td),
    nCyclicPatches_(countPatchType<cyclicPolyPatch>()),
    nEvals_(0)
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

// Copy point information into member data
template<class Type, class TrackingData>
void Foam::PointEdgeWave<Type, TrackingData>::setPointInfo
(
    const labelList& changedPoints,
    const List<Type>& changedPointsInfo
)
{
    forAll(changedPoints, changedPointi)
    {
        const label pointi = changedPoints[changedPointi];

        const bool wasValid = allPointInfo_[pointi].valid(td_);

        // Copy info for pointi
        allPointInfo_[pointi] = changedPointsInfo[changedPointi];

        // Maintain count of unset points
        if (!wasValid && allPointInfo_[pointi].valid(td_))
        {
            --nUnvisitedPoints_;
        }

        // Mark pointi as changed, both on list and on point itself.

        if (changedPoint_.set(pointi))
        {
            changedPoints_.push_back(pointi);
        }
    }

    // Sync
    handleCollocatedPoints();
}


// Propagate information from edge to point. Return number of points changed.
template<class Type, class TrackingData>
Foam::label Foam::PointEdgeWave<Type, TrackingData>::edgeToPoint()
{
    for (const label edgei : changedEdges_)
    {
        if (!changedEdge_.test(edgei))
        {
            FatalErrorInFunction
                << "edge " << edgei
                << " not marked as having been changed" << nl
                << "This might be caused by multiple occurrences of the same"
                << " seed point." << abort(FatalError);
        }


        const Type& neighbourWallInfo = allEdgeInfo_[edgei];

        // Evaluate all connected points (= edge endpoints)
        const edge& e = mesh_.edges()[edgei];

        forAll(e, eI)
        {
            Type& currentWallInfo = allPointInfo_[e[eI]];

            if (!currentWallInfo.equal(neighbourWallInfo, td_))
            {
                updatePoint
                (
                    e[eI],
                    edgei,
                    neighbourWallInfo,
                    currentWallInfo
                );
            }
        }

        // Reset status of edge
        changedEdge_.unset(edgei);
    }

    // Handled all changed edges by now
    changedEdges_.clear();

    if (nCyclicPatches_ > 0)
    {
        // Transfer changed points across cyclic halves
        handleCyclicPatches();
    }
    if (Pstream::parRun())
    {
        // Transfer changed points from neighbouring processors.
        handleProcPatches();
    }

    //if (debug)
    //{
    //    Pout<< "Changed points            : " << nChangedPoints() << nl;
    //}

    // Sum changedPoints over all procs
    return returnReduce(nChangedPoints(), sumOp<label>());
}


// Propagate information from point to edge. Return number of edges changed.
template<class Type, class TrackingData>
Foam::label Foam::PointEdgeWave<Type, TrackingData>::pointToEdge()
{
    const labelListList& pointEdges = mesh_.pointEdges();

    for (const label pointi : changedPoints_)
    {
        if (!changedPoint_.test(pointi))
        {
            FatalErrorInFunction
                << "Point " << pointi
                << " not marked as having been changed" << nl
                << "This might be caused by multiple occurrences of the same"
                << " seed point." << abort(FatalError);
        }

        const Type& neighbourWallInfo = allPointInfo_[pointi];

        // Evaluate all connected edges

        for (const label edgei : pointEdges[pointi])
        {
            Type& currentWallInfo = allEdgeInfo_[edgei];

            if (!currentWallInfo.equal(neighbourWallInfo, td_))
            {
                updateEdge
                (
                    edgei,
                    pointi,
                    neighbourWallInfo,
                    currentWallInfo
                );
            }
        }

        // Reset status of point
        changedPoint_.unset(pointi);
    }

    // Handled all changed points by now
    changedPoints_.clear();

    //if (debug)
    //{
    //    Pout<< "Changed edges             : " << nChangedEdges() << endl;
    //}

    // Sum changedEdges over all procs
    return returnReduce(nChangedEdges(), sumOp<label>());
}


// Iterate
template<class Type, class TrackingData>
Foam::label Foam::PointEdgeWave<Type, TrackingData>::iterate
(
    const label maxIter
)
{
    if (nCyclicPatches_ > 0)
    {
        // Transfer changed points across cyclic halves
        handleCyclicPatches();
    }
    if (Pstream::parRun())
    {
        // Transfer changed points from neighbouring processors.
        handleProcPatches();
    }

    nEvals_ = 0;

    label iter = 0;

    while (iter < maxIter)
    {
        while (iter < maxIter)
        {
            if (debug)
            {
                Info<< typeName << ": Iteration " << iter << endl;
            }

            label nEdges = pointToEdge();

            if (debug)
            {
                Info<< typeName << ": Total changed edges       : "
                    << nEdges << endl;
            }

            if (nEdges == 0)
            {
                break;
            }

            label nPoints = edgeToPoint();

            if (debug)
            {
                Info<< typeName << ": Total changed points      : "
                    << nPoints << nl
                    << typeName << ": Total evaluations         : "
                    << returnReduce(nEvals_, sumOp<label>()) << nl
                    << typeName << ": Remaining unvisited points: "
                    << returnReduce(nUnvisitedPoints_, sumOp<label>()) << nl
                    << typeName << ": Remaining unvisited edges : "
                    << returnReduce(nUnvisitedEdges_, sumOp<label>()) << nl
                    << endl;
            }

            if (nPoints == 0)
            {
                break;
            }

            iter++;
        }


        // Enforce collocated points are exactly equal. This might still mean
        // non-collocated points are not equal though. WIP.
        label nPoints = handleCollocatedPoints();
        if (debug)
        {
            Info<< typeName << ": Collocated point sync     : "
                << nPoints << nl << endl;
        }

        if (nPoints == 0)
        {
            break;
        }
    }

    return iter;
}


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