solidBodyFvGeometryScheme.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
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    Copyright (C) 2021-2022 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

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#include "solidBodyFvGeometryScheme.H"
#include "addToRunTimeSelectionTable.H"
#include "surfaceFields.H"
#include "primitiveMeshTools.H"
#include "emptyPolyPatch.H"

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

namespace Foam
{
    defineTypeNameAndDebug(solidBodyFvGeometryScheme, 0);
    addToRunTimeSelectionTable
    (
        fvGeometryScheme,
        solidBodyFvGeometryScheme,
        dict
    );
}


void Foam::solidBodyFvGeometryScheme::setMeshMotionData()
{
    if (!cacheInitialised_ || !cacheMotion_)
    {
        DebugInFunction << "Creating cache" << endl;

        changedFaceIDs_.clear();    // used for face areas, meshPhi
        changedPatchIDs_.clear();   // used for meshPhi
        changedCellIDs_.clear();    // used for cell volumes

        const pointField& oldPoints = mesh_.oldPoints();
        const pointField& currPoints = mesh_.points();

        if (oldPoints.size() != currPoints.size())
        {
            FatalErrorInFunction
                << "Old and current points sizes must be the same. "
                << "Old points:" << oldPoints.size()
                << " Current points:" << currPoints.size()
                << abort(FatalError);
        }

        bitSet changedPoints(oldPoints.size());

        // Check for non-identical points
        forAll(changedPoints, pointi)
        {
            changedPoints.set(pointi, oldPoints[pointi] != currPoints[pointi]);
        }

        DebugInfo
            << "SBM --- Changed points:"
            << returnReduce(changedPoints.count(), sumOp<label>())
            << endl;

        // Quick return if no points have moved
        if (returnReduceAnd(changedPoints.none()))
        {
            return;
        }

        bitSet cellIDs(mesh_.nCells());
        bitSet faceIDs(mesh_.nFaces());

        const auto& pointFaces = mesh_.pointFaces();
        const auto& own = mesh_.faceOwner();
        const auto& nbr = mesh_.faceNeighbour();

        // Identify faces and cells attached to moving points
        for (const label pointi : changedPoints)
        {
            for (const auto facei : pointFaces[pointi])
            {
                faceIDs.set(facei);

                cellIDs.set(own[facei]);
                if (facei < mesh_.nInternalFaces())
                {
                    cellIDs.set(nbr[facei]);
                }
            }
        }

        changedCellIDs_ = cellIDs.toc();

        DebugInfo
            << "SBM --- Changed cells:"
            << returnReduce(changedCellIDs_.size(), sumOp<label>())
            << endl;


        // Construct face and patch ID info

        const auto changedFaceFlag = faceIDs.values();

        DynamicList<label> changedFaceIDs(faceIDs.count());
        DynamicList<label> changedPatchIDs(faceIDs.count());
        for (label facei = 0; facei < mesh_.nInternalFaces(); ++facei)
        {
            if (changedFaceFlag[facei])
            {
                changedFaceIDs.append(facei);
                changedPatchIDs.append(-1);
            }
        }

        const auto& pbm = mesh_.boundaryMesh();
        for (label patchi = 0; patchi < pbm.size(); ++patchi)
        {
            const polyPatch& pp = pbm[patchi];

            for (const label meshFacei : pp.range())
            {
                if (changedFaceFlag[meshFacei])
                {
                    changedFaceIDs.append(meshFacei);
                    changedPatchIDs.append(patchi);
                }
            }
        }

        changedFaceIDs_.transfer(changedFaceIDs);
        changedPatchIDs_.transfer(changedPatchIDs);
    }

    cacheInitialised_ = true;
}


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

Foam::solidBodyFvGeometryScheme::solidBodyFvGeometryScheme
(
    const fvMesh& mesh,
    const dictionary& dict
)
:
    basicFvGeometryScheme(mesh, dict),
    partialUpdate_(dict.getOrDefault<bool>("partialUpdate", true)),
    cacheMotion_(dict.getOrDefault<bool>("cacheMotion", true)),
    cacheInitialised_(false),
    changedFaceIDs_(),
    changedPatchIDs_(),
    changedCellIDs_()
{
    DebugInFunction
        << "partialUpdate:" << partialUpdate_
        << " cacheMotion:" << cacheMotion_
        << endl;
}


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

void Foam::solidBodyFvGeometryScheme::movePoints()
{
    // Note: not calling fvGeometryScheme::movePoints since we want to perform
    // our own geometry manipulations

    bool haveGeometry =
        mesh_.hasCellCentres()
     && mesh_.hasFaceCentres()
     && mesh_.hasCellVolumes()
     && mesh_.hasFaceAreas();

    if (!haveGeometry)
    {
        DebugInFunction
            << "Creating initial geometry using primitiveMesh::updateGeom"
            << endl;

        const_cast<fvMesh&>(mesh_).primitiveMesh::updateGeom();
        return;
    }

    if (mesh_.moving())
    {
        setMeshMotionData();

        DebugInFunction << "Performing partial meshPhi construction" << endl;

        const pointField& oldPoints = mesh_.oldPoints();
        const pointField& currPoints = mesh_.points();

        if (oldPoints.size() != currPoints.size())
        {
            FatalErrorInFunction
                << "Old and current points sizes must be the same. "
                << "Old points:" << oldPoints.size()
                << " Current points:" << currPoints.size()
                << abort(FatalError);
        }

        const polyBoundaryMesh& pbm = mesh_.boundaryMesh();
        const faceList& faces = mesh_.faces();

        auto tmeshPhi(const_cast<fvMesh&>(mesh_).setPhi());
        if (tmeshPhi)
        {
            const scalar rdt = 1.0/mesh_.time().deltaTValue();

            // Set the mesh flux
            auto& meshPhi = tmeshPhi.ref();
            auto& meshPhii = meshPhi.primitiveFieldRef();
            auto& meshPhiBf = meshPhi.boundaryFieldRef();

            //meshPhi == dimensionedScalar(dimVolume/dimTime, Zero);
            meshPhii = Zero;
            meshPhiBf == Zero;

            forAll(changedFaceIDs_, i)
            {
                const face& f = faces[changedFaceIDs_[i]];

                if (changedPatchIDs_[i] == -1)
                {
                    const label facei = changedFaceIDs_[i];
                    meshPhii[facei] = f.sweptVol(oldPoints, currPoints)*rdt;
                }
                else
                {
                    const label patchi = changedPatchIDs_[i];
                    const polyPatch& pp = pbm[patchi];

                    if (isA<emptyPolyPatch>(pp))
                    {
                        continue;
                    }

                    const label patchFacei = changedFaceIDs_[i] - pp.start();

                    meshPhiBf[patchi][patchFacei] =
                        f.sweptVol(oldPoints, currPoints)*rdt;
                }
            }
        }

        if (partialUpdate_ && haveGeometry)
        {
            // Keep base geometry and update as needed
            DebugInFunction << "Performing partial geometry update" << endl;

            // Initialise geometry using the old/existing values
            vectorField faceCentres(mesh_.faceCentres());
            vectorField faceAreas(mesh_.faceAreas());

            // Make face centres and areas consistent with new points
            primitiveMeshTools::updateFaceCentresAndAreas
            (
                mesh_,
                changedFaceIDs_,
                mesh_.points(),
                faceCentres,
                faceAreas
            );

            vectorField cellCentres(mesh_.cellCentres());
            scalarField cellVolumes(mesh_.cellVolumes());

            primitiveMeshTools::updateCellCentresAndVols
            (
                mesh_,
                faceCentres,
                faceAreas,
                changedCellIDs_,
                mesh_.cells(),
                cellCentres,
                cellVolumes
            );

            const_cast<fvMesh&>(mesh_).primitiveMesh::resetGeometry
            (
                std::move(faceCentres),
                std::move(faceAreas),
                std::move(cellCentres),
                std::move(cellVolumes)
            );

            if (debug)
            {
                for (const auto& p : mesh_.boundaryMesh())
                {
                    Pout<< "SBM --- " << p.name()
                        << " sum(Sf)=" << sum(p.faceAreas())
                        << " sum(mag(Sf))=" << sum(mag(p.faceAreas()))
                        << endl;
                }
            }
        }
        else
        {
            DebugInFunction
                << "Performing complete geometry clear and update" << endl;

            // Clear out old geometry
            // Note: this recreates the old primitiveMesh::movePoints behaviour
            const_cast<fvMesh&>(mesh_).primitiveMesh::clearGeom();

            // Use lower level to calculate the geometry
            const_cast<fvMesh&>(mesh_).primitiveMesh::updateGeom();
        }
    }
    else
    {
        DebugInFunction << "Performing complete geometry update" << endl;

        // Use lower level to calculate the geometry
        const_cast<fvMesh&>(mesh_).primitiveMesh::updateGeom();
    }
}


void Foam::solidBodyFvGeometryScheme::updateMesh(const mapPolyMesh& mpm)
{
    cacheInitialised_ = false;
}


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