MonodomainPurkinjeVolumeMassMatrixAssembler.hpp

/*

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*/

#ifndef MONODOMAINPURKINJEVOLUMEMASSMATRIXASSEMBLER_HPP_
#define MONODOMAINPURKINJEVOLUMEMASSMATRIXASSEMBLER_HPP_

#include "AbstractFeVolumeIntegralAssembler.hpp"
#include "HeartConfig.hpp"

template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
class MonodomainPurkinjeVolumeMassMatrixAssembler
    : public AbstractFeVolumeIntegralAssembler<ELEMENT_DIM, SPACE_DIM, 2, false /*no vectors*/, true/*assembles matrices*/, NORMAL>
{
private:

    double mScaleFactor;

    bool mUseMassLumping;

public:

    c_matrix<double,2*(ELEMENT_DIM+1),2*(ELEMENT_DIM+1)>
        ComputeMatrixTerm(
                c_vector<double, ELEMENT_DIM+1> &rPhi,
                c_matrix<double, SPACE_DIM, ELEMENT_DIM+1> &rGradPhi,
                ChastePoint<SPACE_DIM> &rX,
                c_vector<double,2> &rU,
                c_matrix<double,2,SPACE_DIM> &rGradU /* not used */,
                Element<ELEMENT_DIM,SPACE_DIM>* pElement)
    {
        c_matrix<double, ELEMENT_DIM+1, ELEMENT_DIM+1> mass_matrix = outer_prod(rPhi, rPhi);

        if (mUseMassLumping)
        {
            // not implemented yet (and also not implemented yet in MonodomainPurkinjeCableMassMatrixAssembler)
            NEVER_REACHED;
//            for (unsigned row=0; row<ELEMENT_DIM+1; row++)
//            {
//                for (unsigned column=0; column<ELEMENT_DIM+1; column++)
//                {
//                    if (row != column)
//                    {
//                        mass_matrix(row,row) += mass_matrix(row,column);
//                        mass_matrix(row,column) = 0.0;
//                    }
//                }
//            }
        }

        c_matrix<double,2*(ELEMENT_DIM+1),2*(ELEMENT_DIM+1)> ret
                = zero_matrix<double>(2*(ELEMENT_DIM+1),2*(ELEMENT_DIM+1));
        // even rows, even columns
        matrix_slice<c_matrix<double, 2*ELEMENT_DIM+2, 2*ELEMENT_DIM+2> >
        slice00(ret, slice(0, 2, ELEMENT_DIM+1), slice(0, 2, ELEMENT_DIM+1));
        slice00 = mScaleFactor*mass_matrix;
        return ret;
    }

    MonodomainPurkinjeVolumeMassMatrixAssembler(AbstractTetrahedralMesh<ELEMENT_DIM,SPACE_DIM>* pMesh, bool useMassLumping=false, double scaleFactor=1.0)
        : AbstractFeVolumeIntegralAssembler<ELEMENT_DIM,SPACE_DIM,2,false,true,NORMAL>(pMesh),
          mScaleFactor(scaleFactor),
          mUseMassLumping(useMassLumping)
    {
    }
};

#endif /*MONODOMAINPURKINJEVOLUMEMASSMATRIXASSEMBLER_HPP_*/