Chaste Commit::ca8ccdedf819b6e02855bc0e8e6f50bdecbc5208
MonodomainPurkinjeCableMassMatrixAssembler.hpp
1/*
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34*/
35
36#ifndef MONODOMAINPURKINJECABLEMASSMATRIXASSEMBLER_HPP_
37#define MONODOMAINPURKINJECABLEMASSMATRIXASSEMBLER_HPP_
38
39#include "AbstractFeCableIntegralAssembler.hpp"
40#include "HeartConfig.hpp"
41
55template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
56class MonodomainPurkinjeCableMassMatrixAssembler : public AbstractFeCableIntegralAssembler<ELEMENT_DIM,SPACE_DIM,2,false,true,NORMAL>
57{
58private:
60 static const unsigned CABLE_ELEMENT_DIM = 1;
61
63 static const unsigned NUM_CABLE_ELEMENT_NODES = 2;
64
67
68public:
81 c_matrix<double,2*NUM_CABLE_ELEMENT_NODES,2*NUM_CABLE_ELEMENT_NODES/*2=PROBLEM_DIM here*/>
83 c_vector<double, NUM_CABLE_ELEMENT_NODES>& rPhi,
84 c_matrix<double, SPACE_DIM, NUM_CABLE_ELEMENT_NODES>& rGradPhi,
86 c_vector<double,2>& rU,
87 c_matrix<double,2, SPACE_DIM>& rGradU,
89 {
90 c_matrix<double,4, 4> ret = zero_matrix<double>(4, 4);
91
92 //We have to scale the assembled matrix by the cross sectional area of the Purkinje
93 //fibre to ensure conservation of current at branch points. See #1899.
94 const double fibre_cross_section_area = M_PI*pElement->GetAttribute()*pElement->GetAttribute();
95
96 for(unsigned i=0; i<2; i++) // 2 = number of basis functions per cable element
97 {
98 for(unsigned j=0; j<2; j++) // 2 = number of basis functions per cable element
99 {
100 ret(2*i, 2*j) = 0; // [V,V] block
101 ret(2*i+1,2*j) = 0; // [Vpurkinje,V] block
102 ret(2*i, 2*j+1) = 0; // [V,Vpurkinje] block
103 ret(2*i+1,2*j+1) = rPhi(i)*rPhi(j);
104
105 ret(2*i+1,2*j+1) *= fibre_cross_section_area;
106 }
107 }
108
109 if (mUseMassLumping)
110 {
111 // not implemented yet (and also not implemented yet in MonodomainPurkinjeVolumeMassMatrixAssembler)
113 }
114
115 return ret;
116 }
117
125 : AbstractFeCableIntegralAssembler<ELEMENT_DIM,SPACE_DIM,2,false,true,NORMAL>(pMesh),
126 mUseMassLumping(useMassLumping)
127 {
128 }
129};
130
131#endif /*MONODOMAINPURKINJECABLEMASSMATRIXASSEMBLER_HPP_*/
#define NEVER_REACHED
c_matrix< double, 2 *NUM_CABLE_ELEMENT_NODES, 2 *NUM_CABLE_ELEMENT_NODES > ComputeCableMatrixTerm(c_vector< double, NUM_CABLE_ELEMENT_NODES > &rPhi, c_matrix< double, SPACE_DIM, NUM_CABLE_ELEMENT_NODES > &rGradPhi, ChastePoint< SPACE_DIM > &rX, c_vector< double, 2 > &rU, c_matrix< double, 2, SPACE_DIM > &rGradU, Element< CABLE_ELEMENT_DIM, SPACE_DIM > *pElement)
MonodomainPurkinjeCableMassMatrixAssembler(MixedDimensionMesh< ELEMENT_DIM, SPACE_DIM > *pMesh, bool useMassLumping=false)