petsc_nonlinear_solver.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2017 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_PETSC_NONLINEAR_SOLVER_H
#define LIBMESH_PETSC_NONLINEAR_SOLVER_H

#include "libmesh/libmesh_config.h"

// Petsc include files.
#ifdef LIBMESH_HAVE_PETSC

// Local includes
#include "libmesh/nonlinear_solver.h"
#include "libmesh/petsc_macro.h"

// PETSc includes
# include <petscsnes.h>

namespace libMesh
{
// Allow users access to these functions in case they want to reuse them.  Users shouldn't
// need access to these most of the time as they are used internally by this object.
extern "C"
{
  PetscErrorCode __libmesh_petsc_snes_monitor (SNES, PetscInt its, PetscReal fnorm, void *);
  PetscErrorCode __libmesh_petsc_snes_residual (SNES, Vec x, Vec r, void * ctx);
#if PETSC_RELEASE_LESS_THAN(3,5,0)
  PetscErrorCode __libmesh_petsc_snes_jacobian (SNES, Vec x, Mat * jac, Mat * pc, MatStructure * msflag, void * ctx);
#else
  PetscErrorCode __libmesh_petsc_snes_jacobian (SNES, Vec x, Mat jac, Mat pc, void * ctx);
#endif

  PetscErrorCode __libmesh_petsc_snes_postcheck(
#if PETSC_VERSION_LESS_THAN(3,3,0)
                                                SNES, Vec x, Vec y, Vec w, void * context, PetscBool * changed_y, PetscBool * changed_w
#else
                                                SNESLineSearch, Vec x, Vec y, Vec w, PetscBool * changed_y, PetscBool * changed_w, void * context
#endif
                                                );
}

template <typename T>
class PetscNonlinearSolver : public NonlinearSolver<T>
{
public:
  typedef NonlinearImplicitSystem sys_type;

  explicit
  PetscNonlinearSolver (sys_type & system);

  ~PetscNonlinearSolver ();

  virtual void clear () libmesh_override;

  virtual void init (const char * name = libmesh_nullptr) libmesh_override;

  SNES snes() { this->init(); return _snes; }

  virtual std::pair<unsigned int, Real>
  solve (SparseMatrix<T> &,                     // System Jacobian Matrix
         NumericVector<T> &,                    // Solution vector
         NumericVector<T> &,                    // Residual vector
         const double,                         // Stopping tolerance
         const unsigned int) libmesh_override; // N. Iterations

  virtual void print_converged_reason() libmesh_override;

  SNESConvergedReason get_converged_reason();

  virtual int get_total_linear_iterations() libmesh_override;

  virtual unsigned get_current_nonlinear_iteration_number() const libmesh_override
  { return _current_nonlinear_iteration_number; }

  void set_residual_zero_out(bool state) { _zero_out_residual = state; }

  void set_jacobian_zero_out(bool state) { _zero_out_jacobian = state; }

  void use_default_monitor(bool state) { _default_monitor = state; }

protected:
  SNES _snes;

  SNESConvergedReason _reason;

  PetscInt _n_linear_iterations;

  unsigned _current_nonlinear_iteration_number;

  bool _zero_out_residual;

  bool _zero_out_jacobian;

  bool _default_monitor;

#if !PETSC_VERSION_LESS_THAN(3,3,0)
  void build_mat_null_space(NonlinearImplicitSystem::ComputeVectorSubspace * computeSubspaceObject,
                            void (*)(std::vector<NumericVector<Number> *> &, sys_type &),
                            MatNullSpace *);
#endif
private:
  friend PetscErrorCode __libmesh_petsc_snes_residual (SNES snes, Vec x, Vec r, void * ctx);
#if PETSC_RELEASE_LESS_THAN(3,5,0)
  friend PetscErrorCode __libmesh_petsc_snes_jacobian (SNES snes, Vec x, Mat * jac, Mat * pc, MatStructure * msflag, void * ctx);
#else
  friend PetscErrorCode __libmesh_petsc_snes_jacobian (SNES snes, Vec x, Mat jac, Mat pc, void * ctx);
#endif
};



} // namespace libMesh


#endif // #ifdef LIBMESH_HAVE_PETSC
#endif // LIBMESH_PETSC_NONLINEAR_SOLVER_H