interpolatingSolidBodyMotionSolver.C

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License
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#include "interpolatingSolidBodyMotionSolver.H"
#include "addToRunTimeSelectionTable.H"
#include "pointPatchDist.H"
#include "pointConstraints.H"

// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
    defineTypeNameAndDebug(interpolatingSolidBodyMotionSolver, 0);

    addToRunTimeSelectionTable
    (
        motionSolver,
        interpolatingSolidBodyMotionSolver,
        dictionary
    );
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::interpolatingSolidBodyMotionSolver::interpolatingSolidBodyMotionSolver
(
    const word& name,
    const polyMesh& mesh,
    const dictionary& dict
)
:
    points0MotionSolver(name, mesh, dict, typeName),
    SBMFPtr_(solidBodyMotionFunction::New(coeffDict(), mesh.time())),
    patches_(wordReList(coeffDict().lookup("patches"))),
    patchSet_(mesh.boundaryMesh().patchSet(patches_)),
    CofG_(coeffDict().lookup("CofG")),
    di_(coeffDict().lookup<scalar>("innerDistance")),
    do_(coeffDict().lookup<scalar>("outerDistance")),
    scale_
    (
        IOobject
        (
            "motionScale",
            mesh.time().timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::NO_WRITE,
            false
        ),
        pointMesh::New(mesh),
        dimensionedScalar(dimless, 0)
    )
{
    // Calculate scaling factor everywhere

    {
        const pointMesh& pMesh = pointMesh::New(mesh);

        pointPatchDist pDist(pMesh, patchSet_, points0());

        // Scaling: 1 up to di then linear down to 0 at do away from patches
        scale_.primitiveFieldRef() =
            min
            (
                max
                (
                    (do_ - pDist.primitiveField())/(do_ - di_),
                    scalar(0)
                ),
                scalar(1)
            );

        // Convert the scale function to a cosine
        scale_.primitiveFieldRef() =
            min
            (
                max
                (
                    0.5
                  - 0.5
                   *cos(scale_.primitiveField()
                   *Foam::constant::mathematical::pi),
                    scalar(0)
                ),
                scalar(1)
            );

        pointConstraints::New(pMesh).constrain(scale_);
        scale_.write();
    }
}


// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //

Foam::interpolatingSolidBodyMotionSolver::~interpolatingSolidBodyMotionSolver()
{}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

Foam::tmp<Foam::pointField>
Foam::interpolatingSolidBodyMotionSolver::curPoints() const
{
    const pointField& points0 = this->points0();
    const septernion s = SBMFPtr_().transformation();

    tmp<pointField> tpoints(new pointField(points0));
    pointField& points = tpoints.ref();

    forAll(points, pointi)
    {
        // Move non-stationary points
        if (scale_[pointi] > small)
        {
            // Use solid-body motion where scale = 1
            if (scale_[pointi] > 1 - small)
            {
                points[pointi] =
                    CofG_ + s.transformPoint(points0[pointi] - CofG_);
            }
            // Slerp septernion interpolation
            else
            {
                const septernion ss(slerp(septernion::I, s, scale_[pointi]));

                points[pointi] =
                    CofG_ + ss.transformPoint(points0[pointi] - CofG_);
            }
        }
    }

    return tpoints;
}


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