Newmark Class Reference

Newmark 2nd-order time-integrator for 6DoF solid-body motion. More...

#include <Newmark.H>

Inheritance diagram for Newmark:

Collaboration diagram for Newmark:

Public Member Functions
	TypeName ("Newmark")
	Runtime type information.
	Newmark (const dictionary &dict, sixDoFRigidBodyMotion &body)
	Construct from a dictionary and the body.
virtual autoPtr< sixDoFSolver >	clone () const
	Construct and return a clone.
virtual	~Newmark ()
	Destructor.
virtual void	solve (bool firstIter, const vector &fGlobal, const vector &tauGlobal, scalar deltaT, scalar deltaT0)
	Drag coefficient.
Public Member Functions inherited from sixDoFSolver
	TypeName ("sixDoFSolver")
	Runtime type information.
	declareRunTimeSelectionTable (autoPtr, sixDoFSolver, dictionary,(const dictionary &dict, sixDoFRigidBodyMotion &body),(dict, body))
	sixDoFSolver (const dictionary &dict, sixDoFRigidBodyMotion &body)
virtual	~sixDoFSolver ()
	Destructor.
void	write (Ostream &) const
	Write.

Additional Inherited Members
Static Public Member Functions inherited from sixDoFSolver
static autoPtr< sixDoFSolver >	New (const dictionary &dict, sixDoFRigidBodyMotion &body)
Protected Member Functions inherited from sixDoFSolver
point &	centreOfRotation ()
	Return the current centre of rotation.
tensor &	Q ()
	Return the orientation.
vector &	v ()
	Return non-const access to vector.
vector &	a ()
	Return non-const access to acceleration.
vector &	pi ()
	Return non-const access to angular momentum.
vector &	tau ()
	Return non-const access to torque.
const point &	centreOfRotation0 () const
	Return the centre of rotation at previous time-step.
const tensor &	Q0 () const
	Return the orientation at previous time-step.
const vector &	v0 () const
	Return the velocity at previous time-step.
const vector &	a0 () const
	Return the acceleration at previous time-step.
const vector &	pi0 () const
	Return the angular momentum at previous time-step.
const vector &	tau0 () const
	Return the torque at previous time-step.
scalar	aDamp () const
	Acceleration damping coefficient (for steady-state simulations).
tensor	tConstraints () const
	Translational constraint tensor.
tensor	rConstraints () const
	Rotational constraint tensor.
Tuple2< tensor, vector >	rotate (const tensor &Q0, const vector &pi, const scalar deltaT) const
	Apply rotation tensors to Q0 for the given torque (pi) and deltaT.
void	updateAcceleration (const vector &fGlobal, const vector &tauGlobal)
	Update and relax accelerations from the force and torque.
void	updateConstraints ()
	Update the constraints to the object.
Protected Attributes inherited from sixDoFSolver
sixDoFRigidBodyMotion &	body_
	The rigid body.
dictionary	dict_
	Model dictionary.

Detailed Description

Newmark 2nd-order time-integrator for 6DoF solid-body motion.

Reference:

    Newmark, N. M. (1959).
    A method of computation for structural dynamics.
    Journal of the Engineering Mechanics Division, 85(3), 67-94.

Example specification in dynamicMeshDict:

solver
{
    type    Newmark;
    gamma   0.5;    // Velocity integration coefficient
    beta    0.25;   // Position integration coefficient
}

Source files

• Newmark.H
• Newmark.C

Definition at line 68 of file Newmark.H.

Constructor & Destructor Documentation

Newmark()

Newmark	(	const dictionary &	dict,
		sixDoFRigidBodyMotion &	body )

Construct from a dictionary and the body.

Definition at line 39 of file Newmark.C.

References dict, Foam::max(), sixDoFSolver::sixDoFSolver(), and Foam::sqr().

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~Newmark()

~Newmark ( )

virtual

Destructor.

Definition at line 60 of file Newmark.C.

Member Function Documentation

TypeName()

TypeName

(

"Newmark"

)

Runtime type information.

References dict.

clone()

virtual autoPtr< sixDoFSolver > clone ( ) const

inlinevirtual

Construct and return a clone.

Implements sixDoFSolver.

Definition at line 107 of file Newmark.H.

References sixDoFSolver::body_, sixDoFSolver::dict_, and autoPtr< T >::NewFrom().

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solve()

void solve ( bool firstIter, const vector & fGlobal, const vector & tauGlobal, scalar deltaT, scalar deltaT0 )

virtual

Drag coefficient.

Implements sixDoFSolver.

Definition at line 66 of file Newmark.C.

References sixDoFSolver::a(), sixDoFSolver::a0(), sixDoFSolver::aDamp(), sixDoFSolver::centreOfRotation(), sixDoFSolver::centreOfRotation0(), Tuple2< T1, T2 >::first(), pi(), sixDoFSolver::pi0(), sixDoFSolver::Q(), sixDoFSolver::Q0(), sixDoFSolver::rConstraints(), sixDoFSolver::rotate(), Foam::sqr(), sixDoFSolver::tau(), sixDoFSolver::tau0(), sixDoFSolver::tConstraints(), sixDoFSolver::updateAcceleration(), sixDoFSolver::updateConstraints(), sixDoFSolver::v(), and sixDoFSolver::v0().

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

• src/sixDoFRigidBodyMotion/sixDoFSolvers/Newmark/Newmark.H
• src/sixDoFRigidBodyMotion/sixDoFSolvers/Newmark/Newmark.C