engineCompRatio.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2013 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.
 
    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
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Application
    engineCompRatio
 
Group
    grpPostProcessingUtilities
 
Description
    Calculate the engine geometric compression ratio.
 
    Note: if you have valves and/or extra volumes it will not work,
          since it calculates the volume at BDC and TCD.
 
\*---------------------------------------------------------------------------*/
 
#include "fvCFD.H"
#include "engineTime.H"
#include "engineMesh.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
int main(int argc, char *argv[])
{
    argList::addNote
    (
        "Calculate the engine geometric compression ratio"
    );
 
    #include "setRootCase.H"
    #include "createEngineTime.H"
    #include "createEngineMesh.H"
 
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
    scalar eps = 1.0e-10;
    scalar fullCycle = 360.0;
 
    scalar ca0 = -180.0;
    scalar ca1 = 0.0;
 
    while (runTime.theta() > ca0)
    {
        ca0 += fullCycle;
        ca1 += fullCycle;
    }
 
    while (mag(runTime.theta() - ca0) > eps)
    {
        scalar t0 = runTime.userTimeToTime(ca0 - runTime.theta());
        runTime.setDeltaT(t0);
        ++runTime;
        Info<< "CA = " << runTime.theta() << endl;
        mesh.move();
    }
 
    scalar Vmax = sum(mesh.V().field());
 
    while (mag(runTime.theta() - ca1) > eps)
    {
        scalar t1 = runTime.userTimeToTime(ca1 - runTime.theta());
        runTime.setDeltaT(t1);
        ++runTime;
        Info<< "CA = " << runTime.theta() << endl;
        mesh.move();
    }
 
    scalar Vmin = sum(mesh.V().field());
 
    Info<< "\nVmax = " << Vmax
        << ", Vmin = " << Vmin << nl
        << "Vmax/Vmin = " << Vmax/Vmin << endl;
 
    Info<< "\nEnd\n" << endl;
 
    return 0;
}
 
 
// ************************************************************************* //