volPointInterpolation.C

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2020-2022 OpenCFD Ltd.
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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.
 
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    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 "volPointInterpolation.H"
#include "fvMesh.H"
#include "volFields.H"
#include "pointFields.H"
#include "pointConstraints.H"
#include "surfaceFields.H"
#include "processorPointPatch.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeNameAndDebug(volPointInterpolation, 0);
}
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
bool Foam::volPointInterpolation::hasSeparated(const pointMesh& pMesh)
{
    const pointBoundaryMesh& pbm = pMesh.boundary();
 
    bool hasSpecial = false;
    for (const auto& pp : pbm)
    {
        if (isA<coupledFacePointPatch>(pp) && !isType<processorPointPatch>(pp))
        {
            hasSpecial = true;
            break;
        }
    }
 
    return returnReduceOr(hasSpecial);
}
 
 
void Foam::volPointInterpolation::calcBoundaryAddressing()
{
    if (debug)
    {
        Pout<< "volPointInterpolation::calcBoundaryAddressing() : "
            << "constructing boundary addressing"
            << endl;
    }
 
    const polyBoundaryMesh& pbm = mesh().boundaryMesh();
 
    boundaryPtr_.reset(new primitivePatch(pbm.faces(), mesh().points()));
    const auto& boundary = *boundaryPtr_;
 
    boundaryIsPatchFace_.resize_nocopy(boundary.size());
    boundaryIsPatchFace_ = false;
 
    // Store per mesh point whether it is on any 'real' patch. Currently
    // boolList just so we can use syncUntransformedData (does not take
    // bitSet. Tbd)
    boolList isPatchPoint(mesh().nPoints(), false);
 
    // Get precalculated volField only so we can use coupled() tests for
    // cyclicAMI
    const surfaceScalarField& magSf = mesh().magSf();
 
    forAll(pbm, patchi)
    {
        const polyPatch& pp = pbm[patchi];
 
        if
        (
            !isA<emptyPolyPatch>(pp)
         && !magSf.boundaryField()[patchi].coupled()
        )
        {
            boundaryIsPatchFace_.set(labelRange(pp.offset(), pp.size()));
 
            for (const auto& f : pp.faces())
            {
                UIndirectList<bool>(isPatchPoint, f) = true;
            }
        }
    }
 
    // Make sure point status is synchronised so even processor that holds
    // no face of a certain patch still can have boundary points marked.
    pointConstraints::syncUntransformedData
    (
        mesh(),
        isPatchPoint,
        orEqOp<bool>()
    );
 
    // Convert to bitSet
    isPatchPoint_.reset();
    isPatchPoint_.resize(mesh().nPoints());
    isPatchPoint_.assign(isPatchPoint);
 
    if (debug)
    {
        label nPatchFace = boundaryIsPatchFace_.count();
        label nPatchPoint = isPatchPoint_.count();
 
        Pout<< "boundary:" << nl
            << "    faces :" << boundary.size() << nl
            << "    of which on proper patch:" << nPatchFace << nl
            << "    points:" << boundary.nPoints() << nl
            << "    of which on proper patch:" << nPatchPoint << endl;
    }
}
 
 
void Foam::volPointInterpolation::makeInternalWeights(scalarField& sumWeights)
{
    if (debug)
    {
        Pout<< "volPointInterpolation::makeInternalWeights() : "
            << "constructing weighting factors for internal and non-coupled"
            << " points." << endl;
    }
 
    const pointField& points = mesh().points();
    const labelListList& pointCells = mesh().pointCells();
    const vectorField& cellCentres = mesh().cellCentres();
 
    // Allocate storage for weighting factors
    pointWeights_.clear();
    pointWeights_.setSize(points.size());
 
    // Calculate inverse distances between cell centres and points
    // and store in weighting factor array
    forAll(points, pointi)
    {
        if (!isPatchPoint_[pointi])
        {
            const labelList& pcp = pointCells[pointi];
 
            scalarList& pw = pointWeights_[pointi];
            pw.setSize(pcp.size());
 
            forAll(pcp, pointCelli)
            {
                pw[pointCelli] =
                    1.0/mag(points[pointi] - cellCentres[pcp[pointCelli]]);
 
                sumWeights[pointi] += pw[pointCelli];
            }
        }
    }
}
 
 
void Foam::volPointInterpolation::makeBoundaryWeights(scalarField& sumWeights)
{
    if (debug)
    {
        Pout<< "volPointInterpolation::makeBoundaryWeights() : "
            << "constructing weighting factors for boundary points." << endl;
    }
 
    const pointField& points = mesh().points();
    const pointField& faceCentres = mesh().faceCentres();
 
    const primitivePatch& boundary = boundaryPtr_();
 
    boundaryPointWeights_.clear();
    boundaryPointWeights_.setSize(boundary.meshPoints().size());
 
    forAll(boundary.meshPoints(), i)
    {
        label pointi = boundary.meshPoints()[i];
 
        if (isPatchPoint_[pointi])
        {
            const labelList& pFaces = boundary.pointFaces()[i];
 
            scalarList& pw = boundaryPointWeights_[i];
            pw.setSize(pFaces.size());
 
            sumWeights[pointi] = 0.0;
 
            forAll(pFaces, i)
            {
                if (boundaryIsPatchFace_[pFaces[i]])
                {
                    label facei = mesh().nInternalFaces() + pFaces[i];
 
                    pw[i] = 1.0/mag(points[pointi] - faceCentres[facei]);
                    sumWeights[pointi] += pw[i];
                }
                else
                {
                    pw[i] = 0.0;
                }
            }
        }
    }
}
 
 
void Foam::volPointInterpolation::interpolateOne
(
    const tmp<scalarField>& tnormalisation,
    pointScalarField& pf
) const
{
    if (debug)
    {
        Pout<< "volPointInterpolation::interpolateOne("
            << "pointScalarField&) : "
            << "interpolating oneField"
            <<  " from cells to BOUNDARY points "
            << pf.name() << endl;
    }
 
    const primitivePatch& boundary = boundaryPtr_();
    const labelList& mp = boundary.meshPoints();
    Field<scalar>& pfi = pf.primitiveFieldRef();
 
 
    // 1. Interpolate coupled boundary points from cells
    {
        forAll(mp, i)
        {
            const label pointi = mp[i];
            if (!isPatchPoint_[pointi])
            {
                const scalarList& pw = pointWeights_[pointi];
 
                scalar& val = pfi[pointi];
 
                val = Zero;
                forAll(pw, pointCelli)
                {
                    val += pw[pointCelli];
                }
            }
        }
    }
 
 
    // 2. Interpolate to the patches preserving fixed value BCs
    {
        forAll(mp, i)
        {
            const label pointi = mp[i];
 
            if (isPatchPoint_[pointi])
            {
                const labelList& pFaces = boundary.pointFaces()[i];
                const scalarList& pWeights = boundaryPointWeights_[i];
 
                scalar& val = pfi[pointi];
 
                val = Zero;
                forAll(pFaces, j)
                {
                    if (boundaryIsPatchFace_[pFaces[j]])
                    {
                        val += pWeights[j];
                    }
                }
            }
        }
 
        // Sum collocated contributions
        pointConstraints::syncUntransformedData
        (
            mesh(),
            pfi,
            plusEqOp<scalar>()
        );
 
        // And add separated contributions
        addSeparated(pf);
 
        // Optionally normalise
        if (tnormalisation)
        {
            const scalarField& normalisation = tnormalisation();
            forAll(mp, i)
            {
                pfi[mp[i]] *= normalisation[i];
            }
        }
    }
 
    // Apply constraints
    pointConstraints::New(pf.mesh()).constrain(pf, false);
}
 
 
void Foam::volPointInterpolation::makeWeights()
{
    if (debug)
    {
        Pout<< "volPointInterpolation::makeWeights() : "
            << "constructing weighting factors"
            << endl;
    }
 
    const pointMesh& pMesh = pointMesh::New(mesh());
 
    // Update addressing over all boundary faces
    calcBoundaryAddressing();
 
 
    // Running sum of weights
    tmp<pointScalarField> tsumWeights
    (
        new pointScalarField
        (
            IOobject
            (
                "volPointSumWeights",
                mesh().polyMesh::instance(),
                mesh()
            ),
            pMesh,
            dimensionedScalar(dimless, Zero)
        )
    );
    pointScalarField& sumWeights = tsumWeights.ref();
 
 
    // Create internal weights; add to sumWeights
    makeInternalWeights(sumWeights);
 
 
    // Create boundary weights; override sumWeights
    makeBoundaryWeights(sumWeights);
 
 
    const primitivePatch& boundary = boundaryPtr_();
    const labelList& mp = boundary.meshPoints();
 
 
    // Sum collocated contributions
    pointConstraints::syncUntransformedData
    (
        mesh(),
        sumWeights,
        plusEqOp<scalar>()
    );
 
 
    // And add separated contributions
    addSeparated(sumWeights);
 
 
    // Push master data to slaves. It is possible (not sure how often) for
    // a coupled point to have its master on a different patch so
    // to make sure just push master data to slaves. Reuse the syncPointData
    // structure.
    pushUntransformedData(sumWeights);
 
 
    // Normalise internal weights
    forAll(pointWeights_, pointi)
    {
        scalarList& pw = pointWeights_[pointi];
        // Note:pw only sized for !isPatchPoint
        forAll(pw, i)
        {
            pw[i] /= sumWeights[pointi];
        }
    }
 
    // Normalise boundary weights
    forAll(mp, i)
    {
        const label pointi = mp[i];
 
        scalarList& pw = boundaryPointWeights_[i];
        // Note:pw only sized for isPatchPoint
        forAll(pw, i)
        {
            pw[i] /= sumWeights[pointi];
        }
    }
 
 
    // Normalise separated contributions
    if (hasSeparated_)
    {
        if (debug)
        {
            Pout<< "volPointInterpolation::makeWeights() : "
                << "detected separated coupled patches"
                << " - allocating normalisation" << endl;
        }
 
        // Sum up effect of interpolating one (on boundary points only)
        interpolateOne(tmp<scalarField>(), sumWeights);
 
        // Store as normalisation factor (on boundary points only)
        normalisationPtr_ = new scalarField(mp.size());
        normalisationPtr_.ref() = scalar(1.0);
        normalisationPtr_.ref() /= scalarField(sumWeights, mp);
    }
    else
    {
        normalisationPtr_.clear();
    }
 
 
    if (debug)
    {
        Pout<< "volPointInterpolation::makeWeights() : "
            << "finished constructing weighting factors"
            << endl;
    }
}
 
 
// * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * * //
 
Foam::volPointInterpolation::volPointInterpolation(const fvMesh& vm)
:
    MeshObject_type(vm),
    hasSeparated_(hasSeparated(pointMesh::New(vm)))
{
    makeWeights();
}
 
 
// * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * * //
 
Foam::volPointInterpolation::~volPointInterpolation()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::volPointInterpolation::updateMesh(const mapPolyMesh&)
{
    // Recheck whether has coupled patches
    hasSeparated_ = hasSeparated(pointMesh::New(mesh()));
 
    makeWeights();
}
 
 
bool Foam::volPointInterpolation::movePoints()
{
    makeWeights();
 
    return true;
}
 
 
void Foam::volPointInterpolation::interpolateDisplacement
(
    const volVectorField& vf,
    pointVectorField& pf
) const
{
    interpolateInternalField(vf, pf);
 
    // Interpolate to the patches but no constraints
    interpolateBoundaryField(vf, pf);
 
    // Apply displacement constraints
    const pointConstraints& pcs = pointConstraints::New(pf.mesh());
 
    pcs.constrainDisplacement(pf, false);
}
 
 
// ************************************************************************* //