nonlinear_solver.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2026 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
 
// This library 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
// Lesser General Public License for more details.
 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 
 
// Local Includes
#include "libmesh/nonlinear_solver.h"
#include "libmesh/petsc_nonlinear_solver.h"
#include "libmesh/trilinos_nox_nonlinear_solver.h"
#include "libmesh/solver_configuration.h"
#include "libmesh/enum_solver_package.h"
 
// C++ Includes
#include <memory>
 
 
namespace libMesh
{
 
 
//------------------------------------------------------------------
// NonlinearSolver members
#if defined(LIBMESH_HAVE_PETSC) || defined(LIBMESH_TRILINOS_HAVE_NOX)
template <typename T>
std::unique_ptr<NonlinearSolver<T>>
NonlinearSolver<T>::build(sys_type & s, const SolverPackage solver_package)
{
  // Build the appropriate solver
  switch (solver_package)
    {
 
#ifdef LIBMESH_HAVE_PETSC
    case PETSC_SOLVERS:
      return std::make_unique<PetscNonlinearSolver<T>>(s);
#endif // LIBMESH_HAVE_PETSC
 
#if defined(LIBMESH_TRILINOS_HAVE_NOX) && defined(LIBMESH_TRILINOS_HAVE_EPETRA)
    case TRILINOS_SOLVERS:
      return std::make_unique<NoxNonlinearSolver<T>>(s);
#endif
 
    default:
      libmesh_error_msg("ERROR:  Unrecognized solver package: " << solver_package);
    }
}
 
#else // LIBMESH_HAVE_PETSC || LIBMESH_TRILINOS_HAVE_NOX
 
template <typename T>
std::unique_ptr<NonlinearSolver<T>>
NonlinearSolver<T>::build(sys_type &, const SolverPackage)
{
  libmesh_not_implemented_msg("ERROR: libMesh was compiled without nonlinear solver support");
}
#endif
 
 
template <typename T>
void
NonlinearSolver<T>::attach_preconditioner(Preconditioner<T> * preconditioner)
{
  libmesh_error_msg_if(this->_is_initialized, "Preconditioner must be attached before the solver is initialized!");
 
  _preconditioner = preconditioner;
}
 
template <typename T>
void NonlinearSolver<T>::set_solver_configuration(SolverConfiguration & solver_configuration)
{
  _solver_configuration = &solver_configuration;
}
 
template <typename T>
bool NonlinearSolver<T>::reuse_preconditioner() const
{
  libmesh_not_implemented();
}
 
template <typename T>
void NonlinearSolver<T>::set_reuse_preconditioner(bool reuse)
{
  _reuse_preconditioner = reuse;
}
 
template <typename T>
unsigned int NonlinearSolver<T>::reuse_preconditioner_max_linear_its() const
{
  libmesh_not_implemented();
}
 
template <typename T>
void NonlinearSolver<T>::set_reuse_preconditioner_max_linear_its(unsigned int i)
{
  _reuse_preconditioner_max_linear_its = i;
}
 
//------------------------------------------------------------------
// Explicit instantiations
template class LIBMESH_EXPORT NonlinearSolver<Number>;
 
} // namespace libMesh