Esempio n. 1
0
Foam::dimensionedScalar Foam::engineTime::pistonDisplacement() const
{
    return dimensionedScalar
    (
        "pistonDisplacement",
        dimLength,
        pistonPosition(theta() - deltaTheta()) - pistonPosition().value()
    );
}
Esempio n. 2
0
Foam::dimensionedScalar Foam::engineTime::pistonPosition() const
{
    return dimensionedScalar
    (
        "pistonPosition",
        dimLength,
        pistonPosition(theta())
    );
}
Esempio n. 3
0
void Foam::thoboisMesh::addZonesAndModifiers()
{
    // Add the zones and mesh modifiers to operate piston motion

    if
    (
        pointZones().size() > 0
     && faceZones().size() > 0
     && topoChanger_.size() > 0

    ) 
    {
        Info<< "Time = " << engTime().theta() << endl;
        Info<< "void Foam::thoboisMesh::addZonesAndModifiers() : "
            << "Zones and modifiers already present.  Skipping."
            << endl;
        
        setVirtualPositions();
        checkAndCalculate();

        Info << "Point zones found = " << pointZones().size() << endl;
        Info << "Face zones found = " << faceZones().size() << endl;
        Info << "Cell zones found = " << cellZones().size() << endl;
        
        return;

    }
    else
    {
        pointZones().setSize(0);
        faceZones().setSize(0);
        cellZones().setSize(0);
        topoChanger_.setSize(0);
    }

    
    Info << "checkAndCalculate()" << endl;
    checkAndCalculate();

    Info<< "Time = " << engTime().theta() << endl
        << "Adding zones to the engine mesh" << endl;

/*
    Point zones
    1) Piston points
*/
    
    DynamicList<pointZone*> pz;
 
/*
    Face zones
    1) Piston layer faces

*/
    DynamicList<faceZone*> fz;

/*
*/

    DynamicList<cellZone*> cz;

    label nPointZones = 0;
    label nFaceZones = 0;
    label nCellZones = 0;

/* 

    Adding the following faces zones:
    1:  pistonLayerFaces
    nv: movingFaces
    nv: staticFaces
    nv: detachFaces

    Adding the following point zones:
    1:  pistonPoints
    nv:  movingValvePoints
    nv:  staticValvePoints

*/

#   include "addPistonFacesPointZonesThoboisMesh.H"

//#   include "addAttachDetachFacesThoboisMesh.H"

    Info<< "Adding " << nPointZones << " point, "
        << nFaceZones << " face zones and "
        << nCellZones << " cell zones" << endl;

#   include "addValveFaceZonesThoboisMesh.H"

    pz.setSize(nPointZones);
    Info << "setSize pz" << endl;
    fz.setSize(nFaceZones);
    Info << "setSize fz" << endl;
    cz.setSize(nCellZones);
    Info << "setSize cz" << endl;

    addZones(pz, fz, cz);

#   include "addMeshModifiersThoboisMesh.H"

    // Calculating the virtual positions of piston and valves

    setVirtualPositions();

    // Write mesh and modifiers
    topoChanger_.writeOpt() = IOobject::AUTO_WRITE;
    write();

    Info << "virtualPistonPosition = " << virtualPistonPosition() << endl;
    Info << "piston position = " << pistonPosition() << endl;
}
Esempio n. 4
0
void Foam::verticalValves::checkAndCalculate()
{
    
    label pistonIndex = -1;
    bool foundPiston = false;

    label linerIndex = -1;
    bool foundLiner = false;

    label cylinderHeadIndex = -1;
    bool foundCylinderHead = false;
    
    
    forAll(boundary(), i)
    {
        if (boundary()[i].name() == "piston")
        {
            pistonIndex = i;
            foundPiston = true;
        }
        else if (boundary()[i].name() == "liner")
        {
            linerIndex = i;
            foundLiner = true;
        }
        else if (boundary()[i].name() == "cylinderHead")
        {
            cylinderHeadIndex = i;
            foundCylinderHead = true;
        }
    }
    
    reduce(foundPiston, orOp<bool>());
    reduce(foundLiner, orOp<bool>());
    reduce(foundCylinderHead, orOp<bool>());

    if (!foundPiston)
    {
        FatalErrorIn("Foam::verticalValves::checkAndCalculate()")
            << " : cannot find piston patch"
            << abort(FatalError);
    }

    if (!foundLiner)
    { 
        FatalErrorIn("Foam::verticalValves::checkAndCalculate()")
            << " : cannot find liner patch"
            << abort(FatalError);
    }

    if (!foundCylinderHead)
    { 
        FatalErrorIn("Foam::verticalValves::checkAndCalculate()")
            << " : cannot find cylinderHead patch"
            << exit(FatalError);
    }

    {
        if (linerIndex != -1)
        {
            pistonPosition() =
                max(boundary()[pistonIndex].patch().localPoints()).z();
        }
        reduce(pistonPosition(), minOp<scalar>());

        if (cylinderHeadIndex != -1)
        {
            deckHeight() = min
            (
                boundary()[cylinderHeadIndex].patch().localPoints()
            ).z();

        }
        reduce(deckHeight(), minOp<scalar>());

        Info<< "deckHeight: " << deckHeight() << nl
            << "piston position: " << pistonPosition() << endl;
    }
        
    
} 
Esempio n. 5
0
bool Foam::twoStrokeEngine::update()
{
    // Detaching the interface
    if (attached())
    {
        Info << "Decoupling sliding interfaces" << endl;
        makeSlidersLive();

        // Changing topology by hand
        autoPtr<mapPolyMesh> topoChangeMap5 = topoChanger_.changeMesh();

        if (topoChangeMap5->hasMotionPoints() && topoChangeMap5->morphing())
        {
            Info << "Topology change; executing pre-motion after "
                << "sliding detach" << endl;
            movePoints(topoChangeMap5->preMotionPoints());
        }

        Info << "sliding interfaces successfully decoupled!!!" << endl;
    }
    else
    {
        Info << "Sliding interfaces decoupled" << endl;
    }

    Info << "Executing layer action" << endl;

    // Piston Layering

    makeLayersLive();
    // Changing topology by hand


// /* Tommaso, 23/5/2008

    // Find piston mesh modifier
    const label pistonLayerID =
        topoChanger_.findModifierID("pistonLayer");

    if (pistonLayerID < 0)
    {
        FatalErrorIn("void engineFvMesh::moveAndMorph()")
            << "Piston modifier not found."
            << abort(FatalError);
    }

    scalar minLayerThickness = piston().minLayer();
    scalar deltaZ = engTime().pistonDisplacement().value();
    virtualPistonPosition() += deltaZ;

    Info << "virtualPistonPosition = " << virtualPistonPosition()
    << ", deckHeight = " << deckHeight()
    << ", pistonPosition = " << pistonPosition() << endl;

    if (realDeformation())
    {
        // Dectivate piston layer
        Info << "Mesh deformation mode" << endl;
        topoChanger_[pistonLayerID].disable();
    }
    else
    {
        // Activate piston layer
        Info << "Piston layering mode" << endl;
        topoChanger_[pistonLayerID].enable();
    }


    // Changing topology by hand
    autoPtr<mapPolyMesh> topoChangeMap = topoChanger_.changeMesh();

    // Work array for new points position.
    pointField newPoints = allPoints();
    const pointField& refPoints = allPoints();

    if (topoChangeMap->morphing())
    {
        if (topoChangeMap->hasMotionPoints())
        {
            Info<< "Topology change; executing pre-motion after "
                << "dynamic layering" << endl;
            movePoints(topoChangeMap->preMotionPoints());
            newPoints = topoChangeMap->preMotionPoints();
        }

        setV0();
        resetMotion();
    }

    // Reset the position of layered interfaces

    boolList scaleDisp(nPoints(), true);

    boolList pistonPoint(newPoints.size(), false);
    boolList headPoint(newPoints.size(), false);

    // Make a list of piston and head points. HJ, 2/Dec/2009

    labelList pistonPoints;
    labelList headPoints;
    {
        label pistonCellIndex = cellZones().findZoneID("pistonCells");

        if (pistonCellIndex < 0)
        {
            FatalErrorIn("bool twoStrokeEngine::update()")
                << "Cannot find cell zone pistonCells"
                << abort(FatalError);
        }


        const labelList& pistonCells = cellZones()[pistonCellIndex];

        label headCellIndex = cellZones().findZoneID("headCells");

        if (headCellIndex < 0)
        {
            FatalErrorIn("bool twoStrokeEngine::update()")
                << "Cannot find cell zone headCells"
                << abort(FatalError);
        }

        const labelList& headCells = cellZones()[headCellIndex];

        const labelListList& cp = cellPoints();

        boolList count(newPoints.size(), false);

        forAll (pistonCells, cellI)
        {
            const labelList& curCellPoints = cp[pistonCells[cellI]];

            forAll (curCellPoints, i)
            {
                count[curCellPoints[i]] = true;
            }
        }

        // Count the points
        label nCounted = 0;
        forAll (count, pointI)
        {
            if (count[pointI] == true)
            {
                nCounted++;
            }
        }

        pistonPoints.setSize(nCounted);

        // Collect the points
        nCounted = 0;
        forAll (count, pointI)
        {
            if (count[pointI] == true)
            {
                pistonPoints[nCounted] = pointI;
                nCounted++;
            }
        }

        // Repeat for head points
        count = false;

        forAll (headCells, cellI)
        {
            const labelList& curCellPoints = cp[pistonCells[cellI]];

            forAll (curCellPoints, i)
            {
                count[curCellPoints[i]] = true;
            }
        }

        // Count the points
        nCounted = 0;
        forAll (count, pointI)
        {
            if (count[pointI] == true)
            {
                nCounted++;
            }
        }

        headPoints.setSize(nCounted);

        // Collect the points
        nCounted = 0;
        forAll (count, pointI)
        {
            if (count[pointI] == true)
            {
                headPoints[nCounted] = pointI;
                nCounted++;
            }
        }
    }


    label nScaled = nPoints();

//     label pistonPtsIndex = pointZones().findZoneID("pistonPoints");
//     const labelList& pistonPoints = pointZones()[pistonPtsIndex];

//     label headPtsIndex = pointZones().findZoneID("headPoints");
//     const labelList& headPoints = pointZones()[headPtsIndex];

    const scalarField& movingPointsM = movingPointsMask();

    forAll(pistonPoints, i)
    {
        label pointI = pistonPoints[i];
        pistonPoint[pointI] = true;
        point& p = newPoints[pointI];

        if (p.z() < pistonPosition() - 1.0e-6)
        {
            scaleDisp[pointI] = false;
            nScaled--;
        }
    }