engineSwirl.C

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2011-2015 OpenFOAM Foundation
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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
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    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
    engineSwirl
 
Group
    grpPreProcessingUtilities
 
Description
    Generate a swirl flow for engine calculations.
 
\*---------------------------------------------------------------------------*/
 
#include "fvCFD.H"
#include "unitConversion.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
int main(int argc, char *argv[])
{
    argList::addNote
    (
        "Generate a swirl flow for engine calculations"
    );
 
    #include "setRootCase.H"
    #include "createTime.H"
    #include "createNamedMesh.H"
    #include "createFields.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
    scalar Vphi = (swirlRPMRatio * rpm * rpmToRads()).value();
    scalar b1 = j1(swirlProfile).value();
    scalar b2 = 2.0*b1/swirlProfile.value() - j0(swirlProfile).value();
 
    scalar omega = 0.125*(Vphi*bore*swirlProfile/b2).value();
 
    scalar cylinderRadius = 0.5*bore.value();
 
    scalar Umax = 0.0;
    forAll(mesh.C(), celli)
    {
        vector c = mesh.C()[celli] - swirlCenter;
        scalar r = ::pow(sqr(c & xT) + sqr(c & yT), 0.5);
 
        if (r <= cylinderRadius)
        {
            scalar b = j1(swirlProfile*r/cylinderRadius).value();
            scalar vEff = omega*b;
            r = max(r, SMALL);
            U[celli] = ((vEff/r)*(c & yT))*xT + (-(vEff/r)*(c & xT))*yT;
            Umax = max(Umax, mag(U[celli]));
        }
    }
 
    Info<< "Umax = " << Umax << endl;
 
    U.write();
 
    Info<< nl << "End" << nl << endl;
 
    return 0;
}
 
 
// ************************************************************************* //