LeastSquaresVectors.C

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#include "LeastSquaresVectors.H"
 
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
 
template<class Stencil>
Foam::fv::LeastSquaresVectors<Stencil>::LeastSquaresVectors
(
    const fvMesh& mesh
)
:
    MeshObject_type(mesh),
    vectors_(mesh.nCells())
{
    calcLeastSquaresVectors();
}
 
 
// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
 
template<class Stencil>
Foam::fv::LeastSquaresVectors<Stencil>::~LeastSquaresVectors()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class Stencil>
void Foam::fv::LeastSquaresVectors<Stencil>::calcLeastSquaresVectors()
{
    DebugInFunction << "Calculating least square gradient vectors" << nl;
 
    const fvMesh& mesh = this->mesh_;
    const extendedCentredCellToCellStencil& stencil = this->stencil();
 
    stencil.collectData(mesh.C(), vectors_);
 
    // Create the base form of the dd-tensor
    // including components for the "empty" directions
    const symmTensor dd0(sqr((Vector<label>::one - mesh.geometricD())/2));
 
    forAll(vectors_, i)
    {
        List<vector>& lsvi = vectors_[i];
        symmTensor dd(dd0);
 
        // The current cell is 0 in the stencil
        // Calculate the deltas and sum the weighted dd
        for (label j = 1; j < lsvi.size(); ++j)
        {
            lsvi[j] = lsvi[j] - lsvi[0];
            const scalar magSqrLsvi = magSqr(lsvi[j]);
            dd += sqr(lsvi[j])/magSqrLsvi;
            lsvi[j] /= magSqrLsvi;
        }
 
        // Invert dd
        dd = inv(dd);
 
        // Remove the components corresponding to the empty directions
        dd -= dd0;
 
        // Finalize the gradient weighting vectors
        lsvi[0] = Zero;
        for (label j = 1; j < lsvi.size(); ++j)
        {
            lsvi[j] = dd & lsvi[j];
            lsvi[0] -= lsvi[j];
        }
    }
 
    DebugInfo
        << "Finished calculating least square gradient vectors" << endl;
}
 
 
template<class Stencil>
bool Foam::fv::LeastSquaresVectors<Stencil>::movePoints()
{
    calcLeastSquaresVectors();
    return true;
}
 
 
// ************************************************************************* //