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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2026 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 compression ratio of the engine combustion chamber
If the combustion chamber is not the entire mesh a \c cellSet or
\c cellZone name of the cells in the combustion chamber can be provided.
Usage
\b engineCompRatio [OPTION]
- \par -cellSet \<name\>
Specify the cellSet name of the combustion chamber
- \par -cellZone zoneName
Specify the cellZone name of the combustion chamber
\*---------------------------------------------------------------------------*/
#include "argList.H"
#include "fvMesh.H"
#include "cellSet.H"
using namespace Foam;
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
int main(int argc, char *argv[])
{
#include "addMeshOption.H"
#include "addRegionOption.H"
argList::addOption
(
"cellSet",
"name",
"Calculate the volume of the specified cellSet"
);
argList::addOption
(
"cellZone",
"name",
"Calculate the volume of the specified cellZone"
);
#include "setRootCase.H"
#include "createTime.H"
#include "createSpecifiedMesh.H"
// Cell labels of the cells in the combustion chamber
// Defaults to all cells
labelList ccCells(identityMap(mesh.nCells()));
word cellSetName;
word cellZoneName;
if (args.optionReadIfPresent("cellSet", cellSetName))
{
// Read the cellSet for the combustion chamber
const cellSet ccCellSet(mesh, cellSetName);
ccCells = ccCellSet.toc();
}
else if (args.optionReadIfPresent("cellZone", cellZoneName))
{
const cellZone& ccCellZone = mesh.cellZones()[cellZoneName];
ccCells = ccCellZone;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
const scalar eps = 1.0e-10;
// Search for the CA >= the current CA which is divisible by 180
int ca0 = -360;
while (runTime.userTimeValue() > ca0)
{
ca0 += 180;
}
int ca1 = ca0 + 180;
if (mag(runTime.userTimeValue() - ca0) > eps)
{
const scalar t0 = runTime.userTimeToTime(ca0 - runTime.userTimeValue());
runTime.setDeltaT(t0);
runTime++;
Info<< "Moving to CA = " << runTime.userTimeValue() << endl;
mesh.move();
}
const scalar V0 = gSum(scalarField(mesh.V(), ccCells));
Info << "Volume at " << runTime.userTimeValue() << "CA = " << V0 << endl;
if (mag(runTime.userTimeValue()-ca1) > eps)
{
const scalar t1 = runTime.userTimeToTime(ca1 - runTime.userTimeValue());
runTime.setDeltaT(t1);
runTime++;
Info<< "Moving to CA = " << runTime.userTimeValue() << endl;
mesh.move();
}
const scalar V1 = gSum(scalarField(mesh.V(), ccCells));
Info << "Volume at " << runTime.userTimeValue() << "CA = " << V1 << endl;
const scalar Vmin(min(V0, V1));
const scalar Vmax(max(V0, V1));
Info<< "\nCompression ratio = " << Vmax/Vmin << endl;
Info<< "\nEnd\n" << endl;
return 0;
}
// ************************************************************************* //
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