engineCompRatio.C

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2011-2022 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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

Description
    Calculate the geometric compression ratio.
    Note that if you have valves and/or extra volumes it will not work,
    since it calculates the volume at BDC and TCD.

\*---------------------------------------------------------------------------*/

#include "fvCFD.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

int main(int argc, char *argv[])
{
    #include "setRootCase.H"
    #include "createTime.H"
    #include "createMesh.H"

    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

    scalar eps = 1.0e-10;
    scalar fullCycle = 360.0;

    scalar ca0 = -180.0;
    scalar ca1 = 0.0;

    while (runTime.userTimeValue() > ca0)
    {
        ca0 += fullCycle;
        ca1 += fullCycle;
    }

    while (mag(runTime.userTimeValue() - ca0) > eps)
    {
        scalar t0 = runTime.userTimeToTime(ca0 - runTime.userTimeValue());
        runTime.setDeltaT(t0);
        runTime++;
        Info<< "CA = " << runTime.userTimeValue() << endl;
        mesh.move();
    }

    scalar Vmax = sum(mesh.V().field());

    while (mag(runTime.userTimeValue()-ca1) > eps)
    {
        scalar t1 = runTime.userTimeToTime(ca1 - runTime.userTimeValue());
        runTime.setDeltaT(t1);
        runTime++;
        Info<< "CA = " << runTime.userTimeValue() << endl;
        mesh.move();
    }

    scalar Vmin = sum(mesh.V().field());

    Info<< "\nVmax = " << Vmax;
    Info<< ", Vmin = " << Vmin << endl;
    Info<< "Compression ratio Vmax/Vmin = " << Vmax/Vmin << endl;
    Info<< "\nEnd\n" << endl;

    return 0;
}


// ************************************************************************* //