#include <ode.hpp>

Inheritance diagram for mfem::NewmarkSolver:

Collaboration diagram for mfem::NewmarkSolver:

Public Member Functions
	NewmarkSolver (real_t beta_=0.25, real_t gamma_=0.5, bool no_mult_=false)

void	PrintProperties (std::ostream &os=mfem::out)

void	Step (Vector &x, Vector &dxdt, real_t &t, real_t &dt) override
	Perform a time step from time t [in] to time t [out] based on the requested step size dt [in].

Public Member Functions inherited from mfem::SecondOrderODESolver
	SecondOrderODESolver ()

virtual void	Init (SecondOrderTimeDependentOperator &f)
	Associate a TimeDependentOperator with the ODE solver.

void	EulerStep (Vector &x, Vector &dxdt, real_t &t, real_t &dt)

void	MidPointStep (Vector &x, Vector &dxdt, real_t &t, real_t &dt)

virtual void	Run (Vector &x, Vector &dxdt, real_t &t, real_t &dt, real_t tf)
	Perform time integration from time t [in] to time tf [in].

ODEStateData &	GetState ()
	Functions for getting the state vectors.

const ODEStateData &	GetState () const

int	GetStateSize ()
	Returns how many State vectors the ODE requires.

virtual	~SecondOrderODESolver ()

Additional Inherited Members
Static Public Member Functions inherited from mfem::SecondOrderODESolver
static MFEM_EXPORT SecondOrderODESolver *	Select (const int ode_solver_type)
	Function selecting the desired SecondOrderODESolver.

Static Public Attributes inherited from mfem::SecondOrderODESolver
static MFEM_EXPORT std::string	Types
	Help info for SecondOrderODESolver options.

Protected Attributes inherited from mfem::SecondOrderODESolver
SecondOrderTimeDependentOperator *	f
	Pointer to the associated TimeDependentOperator.

MemoryType	mem_type

ODEStateDataVector	state

Detailed Description

The classical newmark method. Newmark, N. M. (1959) A method of computation for structural dynamics. Journal of Engineering Mechanics, ASCE, 85 (EM3) 67-94.

Definition at line 807 of file ode.hpp.

Constructor & Destructor Documentation

◆ NewmarkSolver()

mfem::NewmarkSolver::NewmarkSolver	(	real_t	beta_ = 0.25,
		real_t	gamma_ = 0.5,
		bool	no_mult_ = false )

inline

Definition at line 814 of file ode.hpp.

Member Function Documentation

◆ PrintProperties()

void mfem::NewmarkSolver::PrintProperties ( std::ostream & os = mfem::out )

Definition at line 1126 of file ode.cpp.

◆ Step()

void mfem::NewmarkSolver::Step	(	Vector &	x,
		Vector &	dxdt,
		real_t &	t,
		real_t &	dt )

overridevirtual

Perform a time step from time t [in] to time t [out] based on the requested step size dt [in].

Parameters

[in,out]	x	Approximate solution.
[in,out]	dxdt	Approximate rate.
[in,out]	t	Time associated with the approximate solution x and rate @ dxdt
[in,out]	dt	Time step size.

The following rules describe the common behavior of the method:

The input x [in] is the approximate solution for the input time t [in].
The input dxdt [in] is the approximate rate for the input time t [in].
The input dt [in] is the desired time step size, defining the desired target time: t [target] = t [in] + dt [in].
The output x [out] is the approximate solution for the output time t [out].
The output dxdt [out] is the approximate rate for the output time t [out].
The output dt [out] is the last time step taken by the method which may be smaller or larger than the input dt [in] value, e.g. because of time step control.
The method may perform more than one time step internally; in this case dt [out] is the last internal time step size.
The output value of t [out] may be smaller or larger than t [target], however, it is not smaller than t [in] + dt [out], if at least one internal time step was performed.
The value x [out] may be obtained by interpolation using internally stored data.
In some cases, the contents of x [in] may not be used, e.g. when x [out] from a previous Step() call was obtained by interpolation.
In consecutive calls to this method, the output t [out] of one Step() call has to be the same as the input t [in] to the next Step() call.
If the previous rule has to be broken, e.g. to restart a time stepping sequence, then the ODE solver must be re-initialized by calling Init() between the two Step() calls.

Implements mfem::SecondOrderODESolver.

Definition at line 1156 of file ode.cpp.

The documentation for this class was generated from the following files:

linalg/ode.hpp
linalg/ode.cpp