chrono::ChTimestepperLeapfrog Class Reference

Description

Performs a step of a Leapfrog explicit integrator.

This is a symplectic method, with 2nd order accuracy, at least when F depends on positions only. Note: uses last step acceleration: changing or resorting the numbering of DOFs will invalidate it. Suggestion: use the ChTimestepperEulerSemiImplicit, it gives the same accuracy with better performance.

#include <ChTimestepper.h>

Inheritance diagram for chrono::ChTimestepperLeapfrog:

Collaboration diagram for chrono::ChTimestepperLeapfrog:

Public Member Functions
	ChTimestepperLeapfrog (ChIntegrableIIorder *intgr=nullptr)
	Constructors (default empty)
virtual Type	GetType () const override
	Return type of the integration method. More...
virtual void	Advance (const double dt) override
	Performs an integration timestep. More...
virtual void	ArchiveOut (ChArchiveOut &archive) override
	Method to allow serialization of transient data to archives.
virtual void	ArchiveIn (ChArchiveIn &archive) override
	Method to allow de-serialization of transient data from archives.
Public Member Functions inherited from chrono::ChTimestepperIIorder
	ChTimestepperIIorder (ChIntegrableIIorder *intgr=nullptr)
	Constructor.
virtual	~ChTimestepperIIorder ()
	Destructor.
virtual ChState &	GetStatePos ()
	Access the state, position part, at current time.
virtual ChStateDelta &	GetStateVel ()
	Access the state, speed part, at current time.
virtual ChStateDelta &	GetStateAcc ()
	Access the acceleration, at current time.
virtual void	SetIntegrable (ChIntegrableIIorder *intgr)
	Set the integrable object.
Public Member Functions inherited from chrono::ChTimestepper
	ChTimestepper (ChIntegrable *intgr=nullptr)
	Constructor.
virtual	~ChTimestepper ()
	Destructor.
virtual ChVectorDynamic &	GetLagrangeMultipliers ()
	Access the lagrangian multipliers, if any.
virtual void	SetIntegrable (ChIntegrable *intgr)
	Set the integrable object.
ChIntegrable *	GetIntegrable ()
	Get the integrable object.
virtual double	GetTime () const
	Get the current time.
virtual void	SetTime (double mt)
	Set the current time.
void	SetVerbose (bool verb)
	Turn on/off logging of messages.
Public Member Functions inherited from chrono::ChExplicitTimestepper
void	SetDiagonalLumpingON (double Ck=1000, double Cr=0)
	Turn on the diagonal lumping. More...
void	SetDiagonalLumpingOFF ()
	Turn off the diagonal lumping (default is off)
double	GetLumpingError ()
	Gets the diagonal lumping error done last time the integrator has been called.
void	ResetLumpingError ()
	Resets the diagonal lumping error.

Protected Attributes
ChStateDelta	Aold
Protected Attributes inherited from chrono::ChTimestepperIIorder
ChState	X
ChStateDelta	V
ChStateDelta	A
Protected Attributes inherited from chrono::ChTimestepper
ChIntegrable *	integrable
double	T
ChVectorDynamic	L
bool	verbose
bool	Qc_do_clamp
double	Qc_clamping
Protected Attributes inherited from chrono::ChExplicitTimestepper
ChLumpingParms *	lumping_parameters

Additional Inherited Members
Public Types inherited from chrono::ChTimestepper
enum	Type {   EULER_IMPLICIT_LINEARIZED = 0, EULER_IMPLICIT_PROJECTED = 1, EULER_IMPLICIT = 2, TRAPEZOIDAL = 3,   TRAPEZOIDAL_LINEARIZED = 4, HHT = 5, HEUN = 6, RUNGEKUTTA45 = 7,   EULER_EXPLICIT = 8, LEAPFROG = 9, NEWMARK = 10, CUSTOM = 20 }
	Available methods for time integration (time steppers).

Member Function Documentation

Advance()

void chrono::ChTimestepperLeapfrog::Advance ( const double  dt )

overridevirtual

Performs an integration timestep.

Parameters

dt	timestep to advance

Implements chrono::ChTimestepper.

GetType()

virtual Type chrono::ChTimestepperLeapfrog::GetType ( ) const

inlineoverridevirtual

Return type of the integration method.

Default is CUSTOM. Derived classes should override this function.

Reimplemented from chrono::ChTimestepper.

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

• /builds/uwsbel/chrono/src/chrono/timestepper/ChTimestepper.h
• /builds/uwsbel/chrono/src/chrono/timestepper/ChTimestepper.cpp