src/dynamicMesh/dynamicFvMesh/dynamicBoxFvMesh/dynamicBoxFvMesh.C

   1 /*---------------------------------------------------------------------------*\
   2   =========                 |
   3   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   4    \\    /   O peration     |
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   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 "dynamicBoxFvMesh.H"
  28 #include "addToRunTimeSelectionTable.H"
  29 #include "volFields.H"
  30 #include "mathematicalConstants.H"
  31
  32 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
  33
  34 namespace Foam
  35 {
  36
  37 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
  38
  39 defineTypeNameAndDebug(dynamicBoxFvMesh, 0);
  40
  41 addToRunTimeSelectionTable(dynamicFvMesh, dynamicBoxFvMesh, IOobject);
  42
  43
  44 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
  45
  46 dynamicBoxFvMesh::dynamicBoxFvMesh(const IOobject& io)
  47 :
  48     dynamicFvMesh(io),
  49     movingMeshCoeffs_
  50     (
  51         IOdictionary
  52         (
  53             IOobject
  54             (
  55                 "dynamicMeshDict",
  56                 io.time().constant(),
  57                 *this,
  58                 IOobject::MUST_READ,
  59                 IOobject::NO_WRITE
  60             )
  61         ).subDict(typeName + "Coeffs")
  62     ),
  63     splitDirection_(movingMeshCoeffs_.lookup("splitDirection")),
  64     leftEdge_(movingMeshCoeffs_.lookup("leftEdge")),
  65     rightEdge_(movingMeshCoeffs_.lookup("rightEdge")),
  66     amplitude_(movingMeshCoeffs_.lookup("amplitude")),
  67     frequency_(readScalar(movingMeshCoeffs_.lookup("frequency"))),
  68     stationaryPoints_
  69     (
  70         IOobject
  71         (
  72             "points",
  73             io.time().constant(),
  74             meshSubDir,
  75             *this,
  76             IOobject::MUST_READ,
  77             IOobject::NO_WRITE
  78         )
  79     ),
  80     motionMarkup_(stationaryPoints_.size(), 0)
  81 {
  82     if (mag(splitDirection_) < SMALL)
  83     {
  84         FatalErrorIn("dynamicBoxFvMesh::dynamicBoxFvMesh(const IOobject& io)")
  85             << "Incorrect definition of split direction"
  86             << abort(FatalError);
  87     }
  88
  89     splitDirection_ /= mag(splitDirection_);
  90
  91     Info<< "Performing a moving mesh calculation: " << nl
  92         << "splitDirection: " << splitDirection_ << nl
  93         << "leftEdge: " << leftEdge_ << nl
  94         << "rightEdge: " << rightEdge_ << nl
  95         << "amplitude: " << amplitude_ << nl
  96         << "frequency: " << frequency_ << endl;
  97
  98     // Calculate vertex markup
  99     scalarField p = points() & splitDirection_;
 100     scalar leftP = (leftEdge_ & splitDirection_);
 101     scalar rightP = (rightEdge_ & splitDirection_);
 102
 103     // Re-scale p to be between 0 and 1
 104
 105     scalar minP = min(p);
 106     p -= minP;
 107     leftP -= minP;
 108     rightP -= minP;
 109
 110     scalar maxP = max(p);
 111     p /= maxP;
 112     leftP /= maxP;
 113     rightP /= maxP;
 114
 115     Info << "leftP: " << leftP << " rightP: " << rightP << " min: " << min(p)
 116          << " max: " << max(p);
 117
 118     // Left part
 119     motionMarkup_ += neg(p - leftP - SMALL)*p/leftP;
 120
 121     // Centre part
 122     motionMarkup_ += neg(p - rightP + SMALL)*pos(p - leftP - SMALL);
 123
 124     // Right part
 125     motionMarkup_ += pos(p - rightP + SMALL)*(1.0 - p)/(1.0 - rightP);
 126 }
 127
 128 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 129
 130 dynamicBoxFvMesh::~dynamicBoxFvMesh()
 131 {}
 132
 133
 134 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 135
 136 bool dynamicBoxFvMesh::update()
 137 {
 138     scalar scalingFunction =
 139         Foam::sin(2*mathematicalConstant::pi*frequency_*time().value());
 140
 141     Info<< "Mesh scaling. Time = " << time().value() << " scaling: "
 142         << scalingFunction << endl;
 143
 144     pointField newPoints =
 145         stationaryPoints_ + motionMarkup_*amplitude_*scalingFunction;
 146
 147     fvMesh::movePoints(newPoints);
 148
 149     // Mesh motion only - return false
 150     return false;
 151 }
 152
 153
 154 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 155
 156 } // End namespace Foam
 157
 158 // ************************************************************************* //