MassMatrixAssembler.hpp

00001 /*
00002 
00003 Copyright (C) University of Oxford, 2005-2011
00004 
00005 University of Oxford means the Chancellor, Masters and Scholars of the
00006 University of Oxford, having an administrative office at Wellington
00007 Square, Oxford OX1 2JD, UK.
00008 
00009 This file is part of Chaste.
00010 
00011 Chaste is free software: you can redistribute it and/or modify it
00012 under the terms of the GNU Lesser General Public License as published
00013 by the Free Software Foundation, either version 2.1 of the License, or
00014 (at your option) any later version.
00015 
00016 Chaste is distributed in the hope that it will be useful, but WITHOUT
00017 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00018 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
00019 License for more details. The offer of Chaste under the terms of the
00020 License is subject to the License being interpreted in accordance with
00021 English Law and subject to any action against the University of Oxford
00022 being under the jurisdiction of the English Courts.
00023 
00024 You should have received a copy of the GNU Lesser General Public License
00025 along with Chaste. If not, see <http://www.gnu.org/licenses/>.
00026 
00027 */
00028 
00029 
00030 #ifndef MASSMATRIXASSEMBLER_HPP_
00031 #define MASSMATRIXASSEMBLER_HPP_
00032 
00033 #include "AbstractFeObjectAssembler.hpp"
00034 #include "HeartConfig.hpp"
00035 
00036 
00046 template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
00047 class MassMatrixAssembler
00048    : public AbstractFeObjectAssembler<ELEMENT_DIM, SPACE_DIM, 1, false /*no vectors*/, true/*assembles matrices*/, NORMAL> 
00049 {
00050 private:
00052     double mScaleFactor;
00053 
00055     bool mUseMassLumping;
00056 
00057 public:
00068     c_matrix<double,1*(ELEMENT_DIM+1),1*(ELEMENT_DIM+1)>
00069         ComputeMatrixTerm(
00070                 c_vector<double, ELEMENT_DIM+1> &rPhi,
00071                 c_matrix<double, SPACE_DIM, ELEMENT_DIM+1> &rGradPhi,
00072                 ChastePoint<SPACE_DIM> &rX,
00073                 c_vector<double,1> &rU,
00074                 c_matrix<double, 1, SPACE_DIM> &rGradU /* not used */,
00075                 Element<ELEMENT_DIM,SPACE_DIM>* pElement)
00076     {
00077         c_matrix<double, ELEMENT_DIM+1, ELEMENT_DIM+1> mass_matrix = outer_prod(rPhi, rPhi);
00078 
00080         if (mUseMassLumping)
00081         {
00082             for (unsigned row=0; row<ELEMENT_DIM+1; row++)
00083             {
00084                 for (unsigned column=0; column<ELEMENT_DIM+1; column++)
00085                 {
00086                     if (row != column)
00087                     {
00088                         mass_matrix(row,row) += mass_matrix(row,column);
00089                         mass_matrix(row,column) = 0.0;
00090                     }
00091                 }
00092             }
00093         }
00094 
00095         return mScaleFactor*mass_matrix;
00096     }
00097 
00104     MassMatrixAssembler(AbstractTetrahedralMesh<ELEMENT_DIM,SPACE_DIM>* pMesh, bool useMassLumping=false, double scaleFactor=1.0)
00105         : AbstractFeObjectAssembler<ELEMENT_DIM,SPACE_DIM,1,false,true,NORMAL>(pMesh),
00106           mScaleFactor(scaleFactor),
00107           mUseMassLumping(useMassLumping)
00108     {
00109     }
00110 };
00111 
00112 #endif /*MASSMATRIXASSEMBLER_HPP_*/

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