linear_implicit_system.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2025 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



#ifndef LIBMESH_LINEAR_IMPLICIT_SYSTEM_H
#define LIBMESH_LINEAR_IMPLICIT_SYSTEM_H

// Local Includes
#include "libmesh/implicit_system.h"

// C++ includes
#include <cstddef>

namespace libMesh
{


// Forward Declarations
template <typename T> class LinearSolver;
template <typename T> class ShellMatrix;


class LinearImplicitSystem : public ImplicitSystem
{
public:

  LinearImplicitSystem (EquationSystems & es,
                        const std::string & name,
                        const unsigned int number);

  LinearImplicitSystem (const LinearImplicitSystem &) = delete;
  LinearImplicitSystem & operator= (const LinearImplicitSystem &) = delete;
  LinearImplicitSystem (LinearImplicitSystem &&) = default;
  LinearImplicitSystem & operator= (LinearImplicitSystem &&) = delete;
  virtual ~LinearImplicitSystem ();

  typedef LinearImplicitSystem sys_type;

  typedef ImplicitSystem Parent;

  sys_type & system () { return *this; }

  virtual void clear () override;

  virtual void init_data () override;

  virtual void reinit () override;

  virtual void assemble () override { ImplicitSystem::assemble(); }

  virtual void restrict_solve_to (const SystemSubset * subset,
                                  const SubsetSolveMode subset_solve_mode=SUBSET_ZERO) override;

  virtual void solve () override;

  virtual LinearSolver<Number> * get_linear_solver() const override;

  virtual void assembly(bool get_residual,
                        bool get_jacobian,
                        bool apply_heterogeneous_constraints = false,
                        bool apply_no_constraints = false) override;

  virtual std::string system_type () const override { return "LinearImplicit"; }

  unsigned int n_linear_iterations() const { return _n_linear_iterations; }

  Real final_linear_residual() const { return _final_linear_residual; }

  void attach_shell_matrix (ShellMatrix<Number> * shell_matrix);

  void detach_shell_matrix () { attach_shell_matrix(nullptr); }

  ShellMatrix<Number> * get_shell_matrix() { return _shell_matrix; }

  virtual void create_static_condensation() override;

protected:

  unsigned int _n_linear_iterations;

  Real _final_linear_residual;

  ShellMatrix<Number> * _shell_matrix;

  const SystemSubset * _subset;

  SubsetSolveMode _subset_solve_mode;
};

} // namespace libMesh

#endif // LIBMESH_LINEAR_IMPLICIT_SYSTEM_H