applications/utilities/postProcessing/wall/wallGradU/wallGradU.C

   1 /*---------------------------------------------------------------------------*\
   2   =========                 |
   3   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   4    \\    /   O peration     |
   5     \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
   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
  13     the Free Software Foundation, either version 3 of the License, or
  14     (at your 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, see <http://www.gnu.org/licenses/>.
  23
  24 Application
  25     wallGradU
  26
  27 Description
  28     Calculates and writes the gradient of U at the wall
  29
  30 \*---------------------------------------------------------------------------*/
  31
  32 #include "fvCFD.H"
  33
  34 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
  35
  36 int main(int argc, char *argv[])
  37 {
  38     timeSelector::addOptions();
  39     #include "setRootCase.H"
  40 #   include "createTime.H"
  41     instantList timeDirs = timeSelector::select0(runTime, args);
  42 #   include "createMesh.H"
  43
  44     forAll(timeDirs, timeI)
  45     {
  46         runTime.setTime(timeDirs[timeI], timeI);
  47         Info<< "Time = " << runTime.timeName() << endl;
  48
  49         IOobject Uheader
  50         (
  51             "U",
  52             runTime.timeName(),
  53             mesh,
  54             IOobject::MUST_READ
  55         );
  56
  57         // Check U exists
  58         if (Uheader.headerOk())
  59         {
  60             mesh.readUpdate();
  61
  62             Info<< "    Reading U" << endl;
  63             volVectorField U(Uheader, mesh);
  64
  65             Info<< "    Calculating wallGradU" << endl;
  66
  67             volVectorField wallGradU
  68             (
  69                 IOobject
  70                 (
  71                     "wallGradU",
  72                     runTime.timeName(),
  73                     mesh,
  74                     IOobject::NO_READ,
  75                     IOobject::AUTO_WRITE
  76                 ),
  77                 mesh,
  78                 dimensionedVector
  79                 (
  80                     "wallGradU",
  81                     U.dimensions()/dimLength,
  82                     vector::zero
  83                 )
  84             );
  85
  86             forAll(wallGradU.boundaryField(), patchi)
  87             {
  88                 wallGradU.boundaryField()[patchi] =
  89                     -U.boundaryField()[patchi].snGrad();
  90             }
  91
  92             wallGradU.write();
  93         }
  94         else
  95         {
  96             Info<< "    No U" << endl;
  97         }
  98     }
  99
 100     Info<< "End" << endl;
 101
 102     return 0;
 103 }
 104
 105
 106 // ************************************************************************* //