/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 1991-2005 OpenCFD Ltd.
     \\/     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 2 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, write to the Free Software Foundation,
    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Application
    engineSwirl

Description
    Generates a swirling flow for engine calulations

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

#include "fvCFD.H"
#include "mathematicalConstants.H"

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

int main(int argc, char *argv[])
{

#   include "setRootCase.H"
#   include "createTime.H"
#   include "createMesh.H"
#   include "createFields.H"

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

    scalar Vphi = (mathematicalConstant::pi*swirlRPMRatio*rpm/30).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 << "\n end\n";

    return(0);
}


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