fvMotionSolverEngineMesh.C

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    Copyright (C) 2011-2016 OpenFOAM Foundation
-------------------------------------------------------------------------------
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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    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
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
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#include "fvMotionSolverEngineMesh.H"
#include "addToRunTimeSelectionTable.H"
#include "fvcMeshPhi.H"
#include "surfaceInterpolate.H"
 
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
namespace Foam
{
    defineTypeNameAndDebug(fvMotionSolverEngineMesh, 0);
    addToRunTimeSelectionTable(engineMesh, fvMotionSolverEngineMesh, IOobject);
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::fvMotionSolverEngineMesh::fvMotionSolverEngineMesh(const IOobject& io)
:
    engineMesh(io),
    pistonLayers_("pistonLayers", dimLength, Zero),
    motionSolver_
    (
        *this,
        engineDB_.engineDict()
    )
{
    engineDB_.engineDict().readIfPresent("pistonLayers", pistonLayers_);
}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
Foam::fvMotionSolverEngineMesh::~fvMotionSolverEngineMesh()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::fvMotionSolverEngineMesh::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();
 
    scalar pistonSpeed = deltaZ/engineDB_.deltaTValue();
 
    motionSolver_.pointMotionU().boundaryFieldRef()[pistonIndex_] ==
        pistonSpeed;
 
    {
        scalarField linerPoints
        (
            boundary()[linerIndex_].patch().localPoints().component(vector::Z)
        );
 
        motionSolver_.pointMotionU().boundaryFieldRef()[linerIndex_] ==
            pistonSpeed*pos0(deckHeight_.value() - linerPoints)
           *(deckHeight_.value() - linerPoints)
           /(deckHeight_.value() - pistonPlusLayers);
    }
 
    motionSolver_.solve();
 
 
    auto* phiPtr = engineDB_.getObjectPtr<surfaceScalarField>("phi");
 
    if (phiPtr)
    {
        auto& phi = *phiPtr;
 
        const auto& rho = engineDB_.lookupObject<volScalarField>("rho");
        const auto& U = engineDB_.lookupObject<volVectorField>("U");
 
        const bool absolutePhi = moving();
        if (absolutePhi)
        {
            // cf. fvc::makeAbsolute
            phi += fvc::interpolate(rho)*fvc::meshPhi(rho, U);
        }
 
        movePoints(motionSolver_.curPoints());
 
        if (absolutePhi)
        {
            // cf. fvc::makeRelative
            phi -= fvc::interpolate(rho)*fvc::meshPhi(rho, U);
        }
    }
    else
    {
        movePoints(motionSolver_.curPoints());
    }
 
 
    pistonPosition_.value() += deltaZ;
 
    Info<< "clearance: " << deckHeight_.value() - pistonPosition_.value() << nl
        << "Piston speed = " << pistonSpeed << " m/s" << endl;
}
 
 
// ************************************************************************* //