PairCollision.C

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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
     \\/     M anipulation  |
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    for more details.
 
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#include "PairCollision.H"
#include "PairModel.H"
#include "WallModel.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::scalar Foam::PairCollision<CloudType>::cosPhiMinFlatWall = 1 - SMALL;
 
template<class CloudType>
Foam::scalar Foam::PairCollision<CloudType>::flatWallDuplicateExclusion =
    sqrt(3*SMALL);
 
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
template<class CloudType>
void Foam::PairCollision<CloudType>::preInteraction()
{
    // Set accumulated quantities to zero
    forAllIter(typename CloudType, this->owner(), iter)
    {
        typename CloudType::parcelType& p = iter();
 
        p.f() = vector::zero;
 
        p.torque() = vector::zero;
    }
}
 
 
template<class CloudType>
void Foam::PairCollision<CloudType>::parcelInteraction()
{
    PstreamBuffers pBufs(Pstream::nonBlocking);
 
    label startOfRequests = Pstream::nRequests();
 
    il_.sendReferredData(this->owner().cellOccupancy(), pBufs);
 
    realRealInteraction();
 
    il_.receiveReferredData(pBufs, startOfRequests);
 
    realReferredInteraction();
}
 
 
template<class CloudType>
void Foam::PairCollision<CloudType>::realRealInteraction()
{
    // Direct interaction list (dil)
    const labelListList& dil = il_.dil();
 
    typename CloudType::parcelType* pA_ptr = NULL;
    typename CloudType::parcelType* pB_ptr = NULL;
 
    List<DynamicList<typename CloudType::parcelType*> >& cellOccupancy =
        this->owner().cellOccupancy();
 
    forAll(dil, realCellI)
    {
        // Loop over all Parcels in cell A (a)
        forAll(cellOccupancy[realCellI], a)
        {
            pA_ptr = cellOccupancy[realCellI][a];
 
            forAll(dil[realCellI], interactingCells)
            {
                List<typename CloudType::parcelType*> cellBParcels =
                    cellOccupancy[dil[realCellI][interactingCells]];
 
                // Loop over all Parcels in cell B (b)
                forAll(cellBParcels, b)
                {
                    pB_ptr = cellBParcels[b];
 
                    evaluatePair(*pA_ptr, *pB_ptr);
                }
            }
 
            // Loop over the other Parcels in cell A (aO)
            forAll(cellOccupancy[realCellI], aO)
            {
                pB_ptr = cellOccupancy[realCellI][aO];
 
                // Do not double-evaluate, compare pointers, arbitrary
                // order
                if (pB_ptr > pA_ptr)
                {
                    evaluatePair(*pA_ptr, *pB_ptr);
                }
            }
        }
    }
}
 
 
template<class CloudType>
void Foam::PairCollision<CloudType>::realReferredInteraction()
{
    // Referred interaction list (ril)
    const labelListList& ril = il_.ril();
 
    List<IDLList<typename CloudType::parcelType> >& referredParticles =
        il_.referredParticles();
 
    List<DynamicList<typename CloudType::parcelType*> >& cellOccupancy =
        this->owner().cellOccupancy();
 
    // Loop over all referred cells
    forAll(ril, refCellI)
    {
        IDLList<typename CloudType::parcelType>& refCellRefParticles =
            referredParticles[refCellI];
 
        const labelList& realCells = ril[refCellI];
 
        // Loop over all referred parcels in the referred cell
 
        forAllIter
        (
            typename IDLList<typename CloudType::parcelType>,
            refCellRefParticles,
            referredParcel
        )
        {
            // Loop over all real cells in that the referred cell is
            // to supply interactions to
 
            forAll(realCells, realCellI)
            {
                List<typename CloudType::parcelType*> realCellParcels =
                    cellOccupancy[realCells[realCellI]];
 
                forAll(realCellParcels, realParcelI)
                {
                    evaluatePair
                    (
                        *realCellParcels[realParcelI],
                        referredParcel()
                    );
                }
            }
        }
    }
}
 
 
template<class CloudType>
void Foam::PairCollision<CloudType>::wallInteraction()
{
    const polyMesh& mesh = this->owner().mesh();
 
    const labelListList& dil = il_.dil();
 
    const labelListList& directWallFaces = il_.dwfil();
 
    const labelList& patchID = mesh.boundaryMesh().patchID();
 
    const volVectorField& U = mesh.lookupObject<volVectorField>(il_.UName());
 
    List<DynamicList<typename CloudType::parcelType*> >& cellOccupancy =
        this->owner().cellOccupancy();
 
    // Storage for the wall interaction sites
    DynamicList<point> flatSitePoints;
    DynamicList<scalar> flatSiteExclusionDistancesSqr;
    DynamicList<WallSiteData<vector> > flatSiteData;
    DynamicList<point> otherSitePoints;
    DynamicList<scalar> otherSiteDistances;
    DynamicList<WallSiteData<vector> > otherSiteData;
    DynamicList<point> sharpSitePoints;
    DynamicList<scalar> sharpSiteExclusionDistancesSqr;
    DynamicList<WallSiteData<vector> > sharpSiteData;
 
    forAll(dil, realCellI)
    {
        // The real wall faces in range of this real cell
        const labelList& realWallFaces = directWallFaces[realCellI];
 
        // Loop over all Parcels in cell
        forAll(cellOccupancy[realCellI], cellParticleI)
        {
            flatSitePoints.clear();
            flatSiteExclusionDistancesSqr.clear();
            flatSiteData.clear();
            otherSitePoints.clear();
            otherSiteDistances.clear();
            otherSiteData.clear();
            sharpSitePoints.clear();
            sharpSiteExclusionDistancesSqr.clear();
            sharpSiteData.clear();
 
            typename CloudType::parcelType& p =
                *cellOccupancy[realCellI][cellParticleI];
 
            const point& pos = p.position();
 
            scalar r = wallModel_->pREff(p);
 
            // real wallFace interactions
 
            forAll(realWallFaces, realWallFaceI)
            {
                label realFaceI = realWallFaces[realWallFaceI];
 
                pointHit nearest = mesh.faces()[realFaceI].nearestPoint
                (
                    pos,
                    mesh.points()
                );
 
                if (nearest.distance() < r)
                {
                    vector normal = mesh.faceAreas()[realFaceI];
 
                    normal /= mag(normal);
 
                    const vector& nearPt = nearest.rawPoint();
 
                    vector pW = nearPt - pos;
 
                    scalar normalAlignment = normal & pW/mag(pW);
 
                    // Find the patchIndex and wallData for WallSiteData object
                    label patchI = patchID[realFaceI - mesh.nInternalFaces()];
 
                    label patchFaceI =
                        realFaceI - mesh.boundaryMesh()[patchI].start();
 
                    WallSiteData<vector> wSD
                    (
                        patchI,
                        U.boundaryField()[patchI][patchFaceI]
                    );
 
                    bool particleHit = false;
                    if (normalAlignment > cosPhiMinFlatWall)
                    {
                        // Guard against a flat interaction being
                        // present on the boundary of two or more
                        // faces, which would create duplicate contact
                        // points. Duplicates are discarded.
                        if
                        (
                            !duplicatePointInList
                            (
                                flatSitePoints,
                                nearPt,
                                sqr(r*flatWallDuplicateExclusion)
                            )
                        )
                        {
                            flatSitePoints.append(nearPt);
 
                            flatSiteExclusionDistancesSqr.append
                            (
                                sqr(r) - sqr(nearest.distance())
                            );
 
                            flatSiteData.append(wSD);
 
                            particleHit = true;
                        }
                    }
                    else
                    {
                        otherSitePoints.append(nearPt);
 
                        otherSiteDistances.append(nearest.distance());
 
                        otherSiteData.append(wSD);
 
                        particleHit = true;
                    }
 
                    if (particleHit)
                    {
                        bool keep = true;
                        this->owner().functions().postFace(p, realFaceI, keep);
                        this->owner().functions().postPatch
                        (
                            p,
                            mesh.boundaryMesh()[patchI],
                            1.0,
                            p.currentTetIndices(),
                            keep
                        );
                     }
                }
            }
 
            // referred wallFace interactions
 
            // The labels of referred wall faces in range of this real cell
            const labelList& cellRefWallFaces = il_.rwfilInverse()[realCellI];
 
            forAll(cellRefWallFaces, rWFI)
            {
                label refWallFaceI = cellRefWallFaces[rWFI];
 
                const referredWallFace& rwf =
                    il_.referredWallFaces()[refWallFaceI];
 
                const pointField& pts = rwf.points();
 
                pointHit nearest = rwf.nearestPoint(pos, pts);
 
                if (nearest.distance() < r)
                {
                    vector normal = rwf.normal(pts);
 
                    normal /= mag(normal);
 
                    const vector& nearPt = nearest.rawPoint();
 
                    vector pW = nearPt - pos;
 
                    scalar normalAlignment = normal & pW/mag(pW);
 
                    // Find the patchIndex and wallData for WallSiteData object
 
                    WallSiteData<vector> wSD
                    (
                        rwf.patchIndex(),
                        il_.referredWallData()[refWallFaceI]
                    );
 
                    bool particleHit = false;
                    if (normalAlignment > cosPhiMinFlatWall)
                    {
                        // Guard against a flat interaction being
                        // present on the boundary of two or more
                        // faces, which would create duplicate contact
                        // points. Duplicates are discarded.
                        if
                        (
                            !duplicatePointInList
                            (
                                flatSitePoints,
                                nearPt,
                                sqr(r*flatWallDuplicateExclusion)
                            )
                        )
                        {
                            flatSitePoints.append(nearPt);
 
                            flatSiteExclusionDistancesSqr.append
                            (
                                sqr(r) - sqr(nearest.distance())
                            );
 
                            flatSiteData.append(wSD);
 
                            particleHit = false;
                        }
                    }
                    else
                    {
                        otherSitePoints.append(nearPt);
 
                        otherSiteDistances.append(nearest.distance());
 
                        otherSiteData.append(wSD);
 
                        particleHit = false;
                    }
 
                    if (particleHit)
                    {
                        // TODO: call cloud function objects for referred
                        //       wall particle interactions
                    }
                }
            }
 
            // All flat interaction sites found, now classify the
            // other sites as being in range of a flat interaction, or
            // a sharp interaction, being aware of not duplicating the
            // sharp interaction sites.
 
            // The "other" sites need to evaluated in order of
            // ascending distance to their nearest point so that
            // grouping occurs around the closest in any group
 
            labelList sortedOtherSiteIndices;
 
            sortedOrder(otherSiteDistances, sortedOtherSiteIndices);
 
            forAll(sortedOtherSiteIndices, siteI)
            {
                label orderedIndex = sortedOtherSiteIndices[siteI];
 
                const point& otherPt = otherSitePoints[orderedIndex];
 
                if
                (
                    !duplicatePointInList
                    (
                        flatSitePoints,
                        otherPt,
                        flatSiteExclusionDistancesSqr
                    )
                )
                {
                    // Not in range of a flat interaction, must be a
                    // sharp interaction.
 
                    if
                    (
                        !duplicatePointInList
                        (
                            sharpSitePoints,
                            otherPt,
                            sharpSiteExclusionDistancesSqr
                        )
                    )
                    {
                        sharpSitePoints.append(otherPt);
 
                        sharpSiteExclusionDistancesSqr.append
                        (
                            sqr(r) - sqr(otherSiteDistances[orderedIndex])
                        );
 
                        sharpSiteData.append(otherSiteData[orderedIndex]);
                    }
                }
            }
 
            evaluateWall
            (
                p,
                flatSitePoints,
                flatSiteData,
                sharpSitePoints,
                sharpSiteData
            );
        }
    }
}
 
 
template<class CloudType>
bool Foam::PairCollision<CloudType>::duplicatePointInList
(
    const DynamicList<point>& existingPoints,
    const point& pointToTest,
    scalar duplicateRangeSqr
) const
{
    forAll(existingPoints, i)
    {
        if (magSqr(existingPoints[i] - pointToTest) < duplicateRangeSqr)
        {
            return true;
        }
    }
 
    return false;
}
 
 
template<class CloudType>
bool Foam::PairCollision<CloudType>::duplicatePointInList
(
    const DynamicList<point>& existingPoints,
    const point& pointToTest,
    const scalarList& duplicateRangeSqr
) const
{
    forAll(existingPoints, i)
    {
        if (magSqr(existingPoints[i] - pointToTest) < duplicateRangeSqr[i])
        {
            return true;
        }
    }
 
    return false;
}
 
 
template<class CloudType>
void Foam::PairCollision<CloudType>::postInteraction()
{
    // Delete any collision records where no collision occurred this step
 
    forAllIter(typename CloudType, this->owner(), iter)
    {
        typename CloudType::parcelType& p = iter();
 
        p.collisionRecords().update();
    }
}
 
 
template<class CloudType>
void Foam::PairCollision<CloudType>::evaluatePair
(
    typename CloudType::parcelType& pA,
    typename CloudType::parcelType& pB
) const
{
    pairModel_->evaluatePair(pA, pB);
}
 
 
template<class CloudType>
void Foam::PairCollision<CloudType>::evaluateWall
(
    typename CloudType::parcelType& p,
    const List<point>& flatSitePoints,
    const List<WallSiteData<vector> >& flatSiteData,
    const List<point>& sharpSitePoints,
    const List<WallSiteData<vector> >& sharpSiteData
) const
{
    wallModel_->evaluateWall
    (
        p,
        flatSitePoints,
        flatSiteData,
        sharpSitePoints,
        sharpSiteData
    );
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::PairCollision<CloudType>::PairCollision
(
    const dictionary& dict,
    CloudType& owner
)
:
    CollisionModel<CloudType>(dict, owner, typeName),
    pairModel_
    (
        PairModel<CloudType>::New
        (
            this->coeffDict(),
            this->owner()
        )
    ),
    wallModel_
    (
        WallModel<CloudType>::New
        (
            this->coeffDict(),
            this->owner()
        )
    ),
    il_
    (
        owner.mesh(),
        readScalar(this->coeffDict().lookup("maxInteractionDistance")),
        Switch
        (
            this->coeffDict().lookupOrDefault
            (
                "writeReferredParticleCloud",
                false
            )
        ),
        this->coeffDict().lookupOrDefault("UName", word("U"))
    )
{}
 
 
template<class CloudType>
Foam::PairCollision<CloudType>::PairCollision
(
    const PairCollision<CloudType>& cm
)
:
    CollisionModel<CloudType>(cm),
    pairModel_(NULL),
    wallModel_(NULL),
    il_(cm.owner().mesh())
{
    // Need to clone to PairModel and WallModel
    NotImplemented;
}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::PairCollision<CloudType>::~PairCollision()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::label Foam::PairCollision<CloudType>::nSubCycles() const
{
    label nSubCycles = 1;
 
    if (pairModel_->controlsTimestep())
    {
        label nPairSubCycles = returnReduce
        (
            pairModel_->nSubCycles(), maxOp<label>()
        );
 
        nSubCycles = max(nSubCycles, nPairSubCycles);
    }
 
    if (wallModel_->controlsTimestep())
    {
        label nWallSubCycles = returnReduce
        (
            wallModel_->nSubCycles(), maxOp<label>()
        );
 
        nSubCycles = max(nSubCycles, nWallSubCycles);
    }
 
    return nSubCycles;
}
 
 
template<class CloudType>
bool Foam::PairCollision<CloudType>::controlsWallInteraction() const
{
    return true;
}
 
 
template<class CloudType>
void Foam::PairCollision<CloudType>::collide()
{
    preInteraction();
 
    parcelInteraction();
 
    wallInteraction();
 
    postInteraction();
}
 
 
// ************************************************************************* //