/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1912                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      dynamicMeshDict;
}

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

dynamicFvMesh   dynamicMotionSolverFvMesh;

motionSolver    coded;
name            myMotion;

codeInclude
#{
    #include "transformField.H"
#};

localCode
#{
    // Generate new set of points
    tmp<pointField> twistColumn
    (
        const scalar& maxRotAngle,
        const pointField& points
    )
    {
        tmp<pointField> tnewPoints(new pointField(points));
        pointField& newPoints = tnewPoints.ref();

        const boundBox bb(points, true);
        const scalar zMin = bb.min()[vector::Z];
        const scalar zSpan = bb.span()[vector::Z];

        forAll(points, pointI)
        {
            const scalar x = points[pointI].component(0);
            const scalar y = points[pointI].component(1);
            const scalar z = points[pointI].component(2);

            // Scale the angle by height
            const scalar localAngle = maxRotAngle*(z-zMin)/zSpan;

            const scalar xr = x*cos(localAngle)-y*sin(localAngle);
            const scalar yr = x*sin(localAngle)+y*cos(localAngle);
            newPoints[pointI] = vector(xr, yr, z);
        }
        return tnewPoints;
    }
#};

code
#{
    const Time& tm = mesh().time();
    const pointField& p0 = points0();

    // Max twist pi at t=10
    const scalar maxRotAngle =
        constant::mathematical::pi*Foam::sin(degToRad(90.0/10.0*tm.value()));

    return twistColumn(maxRotAngle, p0);
#};


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