newmark_solver.h

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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
 
 
 
#ifndef LIBMESH_NEWMARK_SOLVER_H
#define LIBMESH_NEWMARK_SOLVER_H
 
// Local includes
#include "libmesh/second_order_unsteady_solver.h"
 
namespace libMesh
{
class NewmarkSolver : public SecondOrderUnsteadySolver
{
public:
  typedef UnsteadySolver Parent;
 
  explicit
  NewmarkSolver (sys_type & s);
 
  virtual ~NewmarkSolver ();
 
  virtual void advance_timestep () override;
 
  virtual void adjoint_advance_timestep () override;
 
  virtual void compute_initial_accel();
 
  void project_initial_accel (FunctionBase<Number> * f,
                              FunctionBase<Gradient> * g = nullptr);
 
  void set_initial_accel_avail (bool initial_accel_set);
 
  virtual Real error_order() const override;
 
  virtual void solve () override;
 
  virtual bool element_residual (bool request_jacobian,
                                 DiffContext &) override;
 
  virtual bool side_residual (bool request_jacobian,
                              DiffContext &) override;
 
  virtual bool nonlocal_residual (bool request_jacobian,
                                  DiffContext &) override;
 
 
  void set_beta ( Real beta )
  { _beta = beta; }
 
  void set_gamma ( Real gamma )
  { _gamma = gamma; }
 
protected:
 
  Real _beta;
 
  Real _gamma;
 
  bool _is_accel_solve;
 
 
  bool _initial_accel_set;
 
  virtual bool _general_residual (bool request_jacobian,
                                  DiffContext &,
                                  ResFuncType mass,
                                  ResFuncType damping,
                                  ResFuncType time_deriv,
                                  ResFuncType constraint,
                                  ReinitFuncType reinit);
};
 
} // namespace libMesh
 
#endif // LIBMESH_NEWMARK_SOLVER_H