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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 1.19 2007/05/20 23:15:36 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 <PETScMatrix.hpp>
#include <Timer.hpp>
#include <ErrorHandler.hpp>
template <typename MeshType,
DiscretizationType::Type TypeOfDiscretization>
void FiniteElementMethod::__discretizeOnMesh()
{
MemoryManager MM;
bool performAssembling =MM.ReserveMatrix(__A,
problem().numberOfUnknown(),
__degreeOfFreedomSet.size());
MM.ReserveVector(__b,
problem().numberOfUnknown(),
__degreeOfFreedomSet.size());
ffout(2) << "Finite element method: disretization...\n";
ReferenceCounting<FEMDiscretization<MeshType,
TypeOfDiscretization> > FEM
= new FEMDiscretization<MeshType,
TypeOfDiscretization>(problem(),
dynamic_cast<MeshType&>(mesh()),
*__A,*__b, __degreeOfFreedomSet);
if (performAssembling) {
FEM->assembleMatrix();
} else {
ffout(2) << "- keeping previous operator discretization\n";
}
FEM->assembleSecondMember();
ffout(2) << "- discretizing boundary conditions\n";
BoundaryConditionDiscretizationFEM<MeshType,
TypeOfDiscretization>* bcd
= new BoundaryConditionDiscretizationFEM<MeshType,
TypeOfDiscretization>(problem(),
dynamic_cast<MeshType&>(mesh()),
__degreeOfFreedomSet);
bcd->associatesMeshesToBoundaryConditions();
ReferenceCounting<BoundaryConditionDiscretization> bcDiscretization = bcd;
// Set Dirichlet information to the matrix
FEM->setDirichletList(bcDiscretization->getDirichletList());
ffout(2) << "- second member modification\n";
bcDiscretization->setSecondMember(__A,__b);
ffout(2) << "- matrix modification\n";
bcDiscretization->setMatrix(__A,__b);
ffout(2) << "Finite element method: disretization done\n";
if (__A->type() == BaseMatrix::doubleHashedMatrix) {
Timer t;
t.start();
#warning temporary implementation
#ifdef HAVE_PETSC
PETScMatrix* aa
= new PETScMatrix(static_cast<DoubleHashedMatrix&>(*__A));
__A = aa; // now use sparse matrix
#else // HAVE_PETSC
SparseMatrix* aa
= new SparseMatrix(static_cast<DoubleHashedMatrix&>(*__A));
__A = aa; // now use sparse matrix
#endif // HAVE_PETSC
t.stop();
ffout(2) << "Matrix copy: " << t << '\n';
}
}
template <DiscretizationType::Type TypeOfDiscretization>
void FiniteElementMethod::__discretize()
{
switch (mesh().type()) {
case Mesh::cartesianHexahedraMesh: {
this->__discretizeOnMesh<Structured3DMesh, TypeOfDiscretization>();
break;
}
case Mesh::hexahedraMesh: {
this->__discretizeOnMesh<MeshOfHexahedra, TypeOfDiscretization>();
break;
}
case Mesh::tetrahedraMesh: {
this->__discretizeOnMesh<MeshOfTetrahedra, TypeOfDiscretization>();
break;
}
default: {
throw ErrorHandler(__FILE__, __LINE__,
"Cannot use '"+mesh().typeName()+"' for finite element computations",
ErrorHandler::normal);
}
}
}
void FiniteElementMethod::Discretize (ConstReferenceCounting<Problem> Pb)
{
__problem = Pb;
switch(__discretizationType.type()) {
case DiscretizationType::lagrangianFEM0: {
this->__discretize<DiscretizationType::lagrangianFEM0>();
return;
}
case DiscretizationType::lagrangianFEM1: {
this->__discretize<DiscretizationType::lagrangianFEM1>();
return;
}
case DiscretizationType::lagrangianFEM2: {
this->__discretize<DiscretizationType::lagrangianFEM2>();
return;
}
default: {
throw ErrorHandler(__FILE__,__LINE__,
"Discretization type not implemented",
ErrorHandler::normal);
}
}
}
void FiniteElementMethod::Compute (Solution& U)
{
PDESolution& u = static_cast<PDESolution&>(U);
KrylovSolver K(*__A, *__b, __degreeOfFreedomSet);
K.solve(problem(), u.values());
}
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