layeredEngineMesh.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2010 OpenCFD Ltd.
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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 "layeredEngineMesh.H"
#include <OpenFOAM/addToRunTimeSelectionTable.H>
#include <finiteVolume/fvcMeshPhi.H>
#include <finiteVolume/surfaceInterpolate.H>

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

namespace Foam
{

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

defineTypeNameAndDebug(layeredEngineMesh, 0);

addToRunTimeSelectionTable(engineMesh, layeredEngineMesh, IOobject);

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

layeredEngineMesh::layeredEngineMesh(const IOobject& io)
:
    engineMesh(io),
    pistonLayers_("pistonLayers", dimLength, 0.0)
{
    if (engineDB_.engineDict().found("pistonLayers"))
    {
        engineDB_.engineDict().lookup("pistonLayers") >> pistonLayers_;
    }
}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

layeredEngineMesh::~layeredEngineMesh()
{}


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

void layeredEngineMesh::move()
{
    scalar deltaZ = engineDB_.pistonDisplacement().value();
    Info<< "deltaZ = " << deltaZ << endl;

    // Position of the top of the static mesh layers above the piston
    scalar pistonPlusLayers = pistonPosition_.value() + pistonLayers_.value();

    pointField newPoints = points();

    forAll (newPoints, pointi)
    {
        point& p = newPoints[pointi];

        if (p.z() < pistonPlusLayers)           // In piston bowl
        {
            p.z() += deltaZ;
        }
        else if (p.z() < deckHeight_.value())   // In liner region
        {
            p.z() += 
                deltaZ
               *(deckHeight_.value() - p.z())
               /(deckHeight_.value() - pistonPlusLayers);
        }
    }

    if (engineDB_.foundObject<surfaceScalarField>("phi"))
    {
        surfaceScalarField& phi = 
            const_cast<surfaceScalarField&>
            (engineDB_.lookupObject<surfaceScalarField>("phi"));

        const volScalarField& rho =
            engineDB_.lookupObject<volScalarField>("rho");

        const volVectorField& U = 
            engineDB_.lookupObject<volVectorField>("U");

        bool absolutePhi = false;
        if (moving())
        {
            phi += fvc::interpolate(rho)*fvc::meshPhi(rho, U);
            absolutePhi = true;
        }

        movePoints(newPoints);

        if (absolutePhi)
        {
            phi -= fvc::interpolate(rho)*fvc::meshPhi(rho, U);
        }
    }
    else
    {
        movePoints(newPoints);
    }

    pistonPosition_.value() += deltaZ;
    scalar pistonSpeed = deltaZ/engineDB_.deltaT().value();

    Info<< "clearance: " << deckHeight_.value() - pistonPosition_.value() << nl
        << "Piston speed = " << pistonSpeed << " m/s" << endl;
}


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

} // End namespace Foam

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