magneticFoam.C

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/*---------------------------------------------------------------------------*\
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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
    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
    magneticFoam
 
Description
    Solver for the magnetic field generated by permanent magnets.
 
    A Poisson's equation for the magnetic scalar potential psi is solved
    from which the magnetic field intensity H and magnetic flux density B
    are obtained.  The paramagnetic particle force field (H dot grad(H))
    is optionally available.
 
\*---------------------------------------------------------------------------*/
 
#include "argList.H"
#include "magnet.H"
#include "electromagneticConstants.H"
#include "simpleControl.H"
 
#include "fvcGrad.H"
#include "fvcSnGrad.H"
#include "fvcReconstruct.H"
 
#include "fvmLaplacian.H"
 
using namespace Foam;
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
int main(int argc, char *argv[])
{
    argList::addBoolOption
    (
        "noH",
        "do not write the magnetic field intensity field"
    );
 
    argList::addBoolOption
    (
        "noB",
        "do not write the magnetic flux density field"
    );
 
    argList::addBoolOption
    (
        "HdotGradH",
        "write the paramagnetic particle force field"
    );
 
    #include "setRootCase.H"
    #include "createTime.H"
    #include "createMesh.H"
 
    simpleControl simple(mesh);
 
    #include "createFields.H"
 
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
    Info<< "Calculating the magnetic field potential" << endl;
 
    runTime++;
 
    while (simple.correctNonOrthogonal())
    {
        solve(fvm::laplacian(murf, psi) + fvc::div(murf*Mrf));
    }
 
    psi.write();
 
    if (!args.optionFound("noH") || args.optionFound("HdotGradH"))
    {
        volVectorField H
        (
            IOobject
            (
                "H",
                runTime.name(),
                mesh
            ),
            fvc::reconstruct(fvc::snGrad(psi)*mesh.magSf())
        );
 
        if (!args.optionFound("noH"))
        {
            Info<< nl
                << "Creating field H for time "
                << runTime.name() << endl;
 
            H.write();
        }
 
        if (args.optionFound("HdotGradH"))
        {
            Info<< nl
                << "Creating field HdotGradH for time "
                << runTime.name() << endl;
 
            volVectorField HdotGradH
            (
                IOobject
                (
                    "HdotGradH",
                    runTime.name(),
                    mesh
                ),
                H & fvc::grad(H)
            );
 
            HdotGradH.write();
        }
    }
 
    if (!args.optionFound("noB"))
    {
        Info<< nl
            << "Creating field B for time "
            << runTime.name() << endl;
 
        volVectorField B
        (
            IOobject
            (
                "B",
                runTime.name(),
                mesh
            ),
            constant::electromagnetic::mu0
           *fvc::reconstruct(murf*fvc::snGrad(psi)*mesh.magSf() + murf*Mrf)
        );
 
        B.write();
    }
 
    Info<< "\nEnd\n" << endl;
 
    return 0;
}
 
 
// ************************************************************************* //