foam-extend4.1-coherent-io/tutorials/basic/potentialFoam/cylinder/analyticalCylinder/analyticalCylinder.C

/*---------------------------------------------------------------------------*\
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License
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Application
    analyticalCylinder

Description
    Generates an analytical solution for potential flow around a cylinder.
    Can be compared with the solution from the potentialFlow/cylinder example.

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

#include "fvCFD.H"


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

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

#   include "setRootCase.H"

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

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

    Info << "\nEvaluating analytical solution" << endl;

    volVectorField centres = UA.mesh().C();
    volScalarField magCentres = mag(centres);
    volScalarField theta = acos((centres & vector(1,0,0))/magCentres);

    volVectorField cs2theta =
        cos(2*theta)*vector(1,0,0)
      + sin(2*theta)*vector(0,1,0);

    UA = uInfX*(dimensionedVector(vector(1,0,0))
      - pow((radius/magCentres),2)*cs2theta);

    runTime.write();

    Info<< "end" << endl;

    return 0;
}

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