second_order_unsteady_solver.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_SECOND_ORDER_UNSTEADY_SOLVER_H
#define LIBMESH_SECOND_ORDER_UNSTEADY_SOLVER_H

#include "libmesh/unsteady_solver.h"

namespace libMesh
{

// Forward declarations
template <typename T> class FunctionBase;
template <typename T> class VectorValue;
typedef VectorValue<Number> NumberVectorValue;
typedef NumberVectorValue Gradient;

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

  virtual ~SecondOrderUnsteadySolver ();

  virtual unsigned int time_order() const override
  { return 2; }

  virtual void init () override;

  virtual void init_data () override;

  virtual void reinit () override;

  virtual void retrieve_timestep () override;

  void project_initial_rate(FunctionBase<Number> * f,
                            FunctionBase<Gradient> * g = nullptr);

  Number old_solution_rate (const dof_id_type global_dof_number) const;

  Number old_solution_accel (const dof_id_type global_dof_number) const;

protected:

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

  std::unique_ptr<NumericVector<Number>> _old_local_solution_accel;
};

} // end namespace libMesh

# endif // LIBMESH_SECOND_ORDER_UNSTEADY_SOLVER_H