unsteady_solver.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2018 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_UNSTEADY_SOLVER_H
#define LIBMESH_UNSTEADY_SOLVER_H

// Local includes
#include "libmesh/auto_ptr.h" // deprecated
#include "libmesh/libmesh_common.h"
#include "libmesh/numeric_vector.h"
#include "libmesh/time_solver.h"

// C++ includes
#include <memory>

namespace libMesh
{

class UnsteadySolver : public TimeSolver
{
public:
  explicit
  UnsteadySolver (sys_type & s);

  virtual ~UnsteadySolver ();

  virtual void init () override;

  virtual void init_data () override;

  virtual void reinit () override;

  virtual void solve () override;

  virtual void advance_timestep () override;

  virtual void adjoint_advance_timestep () override;

  virtual void retrieve_timestep () override;

  virtual Real error_order () const = 0;

  virtual unsigned int time_order () const = 0;

  Number old_nonlinear_solution (const dof_id_type global_dof_number) const;

  std::unique_ptr<NumericVector<Number>> old_local_nonlinear_solution;

  virtual Real du(const SystemNorm & norm) const override;

  virtual bool is_steady() const override { return false; }

protected:

  bool first_solve;

  bool first_adjoint_step;
};



} // namespace libMesh


#endif // LIBMESH_UNSTEADY_SOLVER_H