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// This file is part of ff3d - http://www.freefem.org/ff3d
// Copyright (C) 2001, 2002, 2003 Stphane Del Pino
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// $Id: FiniteElementMethod.cpp,v 1.4 2004/02/01 16:15:11 delpinux Exp $
#include <FiniteElementMethod.hpp>
#include <PDESolution.hpp>
#include <PDEProblem.hpp>
#include <Structured3DMesh.hpp>
#include <MeshOfHexahedra.hpp>
#include <MeshOfTetrahedra.hpp>
#include <FEMDiscretization.hpp>
#include <BoundaryConditionDiscretizationFEM.hpp>
#include <map>
#include <list>
#include <KrylovSolver.hpp>
#include <MatrixManagement.hpp>
#include <SparseMatrix.hpp>
#include <Timer.hpp>
template <typename MeshType>
void FiniteElementMethod::__discretize()
{
MemoryManager MM;
bool performAssembling =MM.ReserveMatrix(__A,
problem().numberOfUnknown(),
__degreeOfFreedomSet.size());
ffout(2) << "reserve \n";
MM.ReserveVector(__b,
problem().numberOfUnknown(),
__degreeOfFreedomSet.size());
ffout(2) << "Discretizing the PDE Problem ... ";
ReferenceCounting<FEMDiscretization<MeshType> > FEM
= new FEMDiscretization<MeshType>(problem(),
dynamic_cast<MeshType&>(mesh()),
*__A,*__b, __degreeOfFreedomSet);
// mesh().CreateReferences(Omega);
if (performAssembling) {
(*FEM).assembleMatrix();
} else {
ffout(2) << "keeping previous operator discretization\n";
}
(*FEM).assembleSecondMember();
ffout(2) << "done\n";
ffout(2) << "Discretizing Boundary Conditions\n";
BoundaryConditionDiscretizationFEM<MeshType>* bcd
= new BoundaryConditionDiscretizationFEM<MeshType>(problem(),
dynamic_cast<MeshType&>(mesh()),
__degreeOfFreedomSet);
bcd->associatesMeshesToBoundaryConditions();
ReferenceCounting<BoundaryConditionDiscretization> bcDiscretization = bcd;
ffout(2) << "Second Member Modification\n";
(*bcDiscretization).setSecondMember(__A,__b);
ffout(2) << "Matrix Modification\n";
(*bcDiscretization).setMatrix(__A,__b);
ffout(2) << "done\n";
if ((*__A).type() == BaseMatrix::doubleHashedMatrix) {
Timer t;
t.start();
SparseMatrix* aa
= new SparseMatrix(static_cast<DoubleHashedMatrix&>(*__A));
__A = aa; // now use sparse matrix
t.stop();
ffout(2) << "Matrix copy: " << t << '\n';
}
}
void FiniteElementMethod::Discretize (ConstReferenceCounting<Problem> Pb)
{
__problem = Pb;
switch (mesh().type()) {
case Mesh::cartesianHexahedraMesh: {
this->__discretize<Structured3DMesh>();
break;
}
case Mesh::hexahedraMesh: {
this->__discretize<MeshOfHexahedra>();
break;
}
case Mesh::tetrahedraMesh: {
this->__discretize<MeshOfTetrahedra>();
break;
}
default: {
fferr(0) << "type: " << mesh().type() << '\n';
fferr(0) << "alors:" << Mesh::tetrahedraMesh << '\n';
fferr(0) << __FILE__ << ':' << __LINE__ << ": Not implemented\n";
fferr(0) << "this mesh type is not supported by standard FEM\n";
std::exit(1);
}
}
}
void FiniteElementMethod::Compute (Solution& U)
{
PDESolution& u = static_cast<PDESolution&>(U);
ffout(2) << "Solving the linear system\n";
KrylovSolver K(*__A, *__b, __degreeOfFreedomSet);
K.solve(u.values(), problem());
}
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