Chaste  Release::2018.1
MonodomainPurkinjeCableMassMatrixAssembler.hpp
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35 
36 #ifndef MONODOMAINPURKINJECABLEMASSMATRIXASSEMBLER_HPP_
37 #define MONODOMAINPURKINJECABLEMASSMATRIXASSEMBLER_HPP_
38 
39 #include "AbstractFeCableIntegralAssembler.hpp"
40 #include "HeartConfig.hpp"
41 
55 template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
56 class MonodomainPurkinjeCableMassMatrixAssembler : public AbstractFeCableIntegralAssembler<ELEMENT_DIM,SPACE_DIM,2,false,true,NORMAL>
57 {
58 private:
60  static const unsigned CABLE_ELEMENT_DIM = 1;
61 
63  static const unsigned NUM_CABLE_ELEMENT_NODES = 2;
64 
67 
68 public:
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_*/
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)
#define NEVER_REACHED
Definition: Exception.hpp:206
MonodomainPurkinjeCableMassMatrixAssembler(MixedDimensionMesh< ELEMENT_DIM, SPACE_DIM > *pMesh, bool useMassLumping=false)