src/engine/engineMesh/layeredEngineMesh/layeredEngineMesh.C

   1 /*---------------------------------------------------------------------------*\
   2   =========                 |
   3   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   4    \\    /   O peration     |
   5     \\  /    A nd           | Copyright (C) 1991-2009 OpenCFD Ltd.
   6      \\/     M anipulation  |
   7 -------------------------------------------------------------------------------
   8 License
   9     This file is part of OpenFOAM.
  10
  11     OpenFOAM is free software; you can redistribute it and/or modify it
  12     under the terms of the GNU General Public License as published by the
  13     Free Software Foundation; either version 2 of the License, or (at your
  14     option) any later version.
  15
  16     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
  17     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19     for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with OpenFOAM; if not, write to the Free Software Foundation,
  23     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  24
  25 \*---------------------------------------------------------------------------*/
  26
  27 #include "layeredEngineMesh.H"
  28 #include "addToRunTimeSelectionTable.H"
  29 #include "fvcMeshPhi.H"
  30 #include "surfaceInterpolate.H"
  31
  32 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
  33
  34 namespace Foam
  35 {
  36
  37 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
  38
  39 defineTypeNameAndDebug(layeredEngineMesh, 0);
  40
  41 addToRunTimeSelectionTable(engineMesh, layeredEngineMesh, IOobject);
  42
  43 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
  44
  45 layeredEngineMesh::layeredEngineMesh(const IOobject& io)
  46 :
  47     engineMesh(io),
  48     pistonLayers_("pistonLayers", dimLength, 0.0)
  49 {
  50     if (engineDB_.engineDict().found("pistonLayers"))
  51     {
  52         engineDB_.engineDict().lookup("pistonLayers") >> pistonLayers_;
  53     }
  54 }
  55
  56
  57 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
  58
  59 layeredEngineMesh::~layeredEngineMesh()
  60 {}
  61
  62
  63 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
  64
  65 void layeredEngineMesh::move()
  66 {
  67     scalar deltaZ = engineDB_.pistonDisplacement().value();
  68     Info<< "deltaZ = " << deltaZ << endl;
  69
  70     // Position of the top of the static mesh layers above the piston
  71     scalar pistonPlusLayers = pistonPosition_.value() + pistonLayers_.value();
  72
  73     pointField newPoints = points();
  74
  75     forAll (newPoints, pointi)
  76     {
  77         point& p = newPoints[pointi];
  78
  79         if (p.z() < pistonPlusLayers)           // In piston bowl
  80         {
  81             p.z() += deltaZ;
  82         }
  83         else if (p.z() < deckHeight_.value())   // In liner region
  84         {
  85             p.z() +=
  86                 deltaZ
  87                *(deckHeight_.value() - p.z())
  88                /(deckHeight_.value() - pistonPlusLayers);
  89         }
  90     }
  91
  92     if (engineDB_.foundObject<surfaceScalarField>("phi"))
  93     {
  94         surfaceScalarField& phi =
  95             const_cast<surfaceScalarField&>
  96             (engineDB_.lookupObject<surfaceScalarField>("phi"));
  97
  98         const volScalarField& rho =
  99             engineDB_.lookupObject<volScalarField>("rho");
 100
 101         const volVectorField& U =
 102             engineDB_.lookupObject<volVectorField>("U");
 103
 104         bool absolutePhi = false;
 105         if (moving())
 106         {
 107             phi += fvc::interpolate(rho)*fvc::meshPhi(rho, U);
 108             absolutePhi = true;
 109         }
 110
 111         movePoints(newPoints);
 112
 113         if (absolutePhi)
 114         {
 115             phi -= fvc::interpolate(rho)*fvc::meshPhi(rho, U);
 116         }
 117     }
 118     else
 119     {
 120         movePoints(newPoints);
 121     }
 122
 123     pistonPosition_.value() += deltaZ;
 124     scalar pistonSpeed = deltaZ/engineDB_.deltaT().value();
 125
 126     Info<< "clearance: " << deckHeight_.value() - pistonPosition_.value() << nl
 127         << "Piston speed = " << pistonSpeed << " m/s" << endl;
 128 }
 129
 130
 131 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 132
 133 } // End namespace Foam
 134
 135 // ************************************************************************* //