Frictional+Elastic interaction between particles between rotational particles. More...

#include <RotFricInteraction.h>

Inheritance diagram for CRotFrictionInteraction:

Collaboration diagram for CRotFrictionInteraction:

Public Types
typedef CRotFrictionIGP	ParameterType

typedef double(CRotFrictionInteraction::*	ScalarFieldFunction )() const

typedef pair< bool, double > (CRotFrictionInteraction::*	CheckedScalarFieldFunction )() const

typedef Vec3(CRotFrictionInteraction::*	VectorFieldFunction )() const

Public Member Functions
	CRotFrictionInteraction ()

	CRotFrictionInteraction (CRotParticle , CRotParticle , const CRotFrictionIGP &)

virtual	~CRotFrictionInteraction ()

virtual void	calcForces ()

virtual void	calcSimpleForces ()

virtual void	calcRigidBodyForces ()

virtual bool	isPersistent ()

void	setTimeStepSize (double dt)

void	calcNormalForce ()

double	getAbsForceDeficit () const

double	getPotentialEnergy () const

double	getSlipping () const

double	getSticking () const

double	getDissipatedEnergy () const

double	getAbsSlip () const

virtual double	Count () const

virtual Vec3	getPos () const

Vec3	getForce () const

Vec3	getNormalForce () const

Vec3	getTangentialForce () const

virtual void	saveRestartData (std::ostream &oStream)

virtual void	loadRestartData (std::istream &iStream)

Public Member Functions inherited from ARotPairInteraction
	ARotPairInteraction ()

	ARotPairInteraction (CRotParticle , CRotParticle )

virtual	~ARotPairInteraction ()

const CParticle *	first () const

const CParticle *	second () const

CRotParticle *	first ()

CRotParticle *	second ()

pair< int, int >	getPairID () const

void	checkIDs ()

virtual bool	hasTag (int, int) const

virtual Vec3	getPosFirst () const

virtual Vec3	getPosSecond () const

void	setPP (CRotParticle , CRotParticle )

void	setPP (const vector< CRotParticle * >)

esys::lsm::quintuple< Vec3, double, Vec3, double, Vec3 >	getRaw2Data () const

virtual void	calcHeatTrans ()

virtual void	calcHeatFrict ()

Public Member Functions inherited from AInteraction
	AInteraction ()

virtual	~AInteraction ()

bool	initialized () const

vector< int >	getAllID () const

int	getID ()

double	Count () const

Static Public Member Functions
static CheckedScalarFieldFunction	getCheckedScalarFieldFunction (const string &)

static ScalarFieldFunction	getScalarFieldFunction (const string &)

static VectorFieldFunction	getVectorFieldFunction (const string &)

static string	getType ()

Private Attributes
double	m_k
	spring constant More...

double	m_r0
	equilibrium distance More...

double	m_mu_d
	coefficient of dynamic friction More...

double	m_mu_s
	coefficient of static friction More...

double	m_ks
	shear stiffness (Cundall) More...

double	m_dt
	time step More...

Vec3	m_Ffric
	current frictional force More...

Vec3	m_force_deficit
	difference between fric. force & force necessary for slip More...

Vec3	m_cpos
	contact position More...

Vec3	m_normal_force
	current normal force More...

bool	m_is_slipping
	static/dynamic status of the interaction More...

bool	m_is_touching
	contact status of the interaction More...

double	m_E_diss
	dissipated energy More...

bool	m_scaling
	toggles scaling of elastic properties by particle size More...

bool	m_rigid
	toggles whether to use rigid body friction interactions More...

bool	m_meanR_scaling
	toggles whether to use the mean particle radius or minimum particle radius to define bond radius More...

Friends
class	TML_PackedMessageInterface

ostream &	operator<< (ostream &, const CRotFrictionInteraction &)

Additional Inherited Members
Protected Attributes inherited from ARotPairInteraction
CRotParticle *	m_p1

CRotParticle *	m_p2

Protected Attributes inherited from AInteraction
vector< int >	m_id
	id's of the particles involved More...

int	m_iid
	interaction id More...

bool	m_init

Detailed Description

Frictional+Elastic interaction between particles between rotational particles.

Author: Shane Latham, Steffen Abe $Revision$ $Date$

Member Typedef Documentation

typedef pair<bool,double>(CRotFrictionInteraction::* CRotFrictionInteraction::CheckedScalarFieldFunction)() const

typedef CRotFrictionIGP CRotFrictionInteraction::ParameterType

typedef double(CRotFrictionInteraction::* CRotFrictionInteraction::ScalarFieldFunction)() const

typedef Vec3(CRotFrictionInteraction::* CRotFrictionInteraction::VectorFieldFunction)() const

Constructor & Destructor Documentation

CRotFrictionInteraction::CRotFrictionInteraction ( )

References m_dt, m_E_diss, m_Ffric, m_is_slipping, m_is_touching, m_k, m_ks, m_meanR_scaling, m_mu_d, m_mu_s, m_r0, m_rigid, and m_scaling.

CRotFrictionInteraction::CRotFrictionInteraction	(	CRotParticle *	p1,
		CRotParticle *	p2,
		const CRotFrictionIGP &	param
	)

References CRotFrictionIGP::dt, CParticle::getDo2dCalculations(), CBasicParticle::getPos(), CBasicParticle::getRad(), CRotFrictionIGP::k, CRotFrictionIGP::k_s, m_cpos, m_dt, m_E_diss, m_Ffric, m_is_slipping, m_is_touching, m_k, m_ks, m_meanR_scaling, m_mu_d, m_mu_s, m_r0, m_rigid, m_scaling, CRotFrictionIGP::meanR_scaling, CRotFrictionIGP::mu_d, CRotFrictionIGP::mu_s, CRotFrictionIGP::rigid, and CRotFrictionIGP::scaling.

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CRotFrictionInteraction::~CRotFrictionInteraction ( )

virtual

Member Function Documentation

void CRotFrictionInteraction::calcForces ( )

virtual

Implements ARotPairInteraction.

References calcRigidBodyForces(), calcSimpleForces(), and m_rigid.

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void CRotFrictionInteraction::calcNormalForce ( )

Calculate the normal force.

References CBasicParticle::getPos(), CBasicParticle::getRad(), m_k, m_normal_force, ARotPairInteraction::m_p1, and ARotPairInteraction::m_p2.

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void CRotFrictionInteraction::calcRigidBodyForces ( )

virtual

Yucang Wang's friction implementation which takes into account rigid body rotation of particle-pairs.

References CParticle::applyForce(), CRotParticle::applyMoment(), cross(), dot(), CRotParticle::getAngVel(), CBasicParticle::getPos(), CBasicParticle::getRad(), CParticle::getVel(), m_cpos, m_dt, m_E_diss, m_Ffric, m_force_deficit, m_is_slipping, m_is_touching, m_k, m_ks, m_mu_d, m_mu_s, m_normal_force, ARotPairInteraction::m_p1, ARotPairInteraction::m_p2, and Vec3::norm().

Referenced by calcForces().

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void CRotFrictionInteraction::calcSimpleForces ( )

virtual

Calculate elastic and frictional forces. Rigid body rotations of particle-pairs are ignored

References CParticle::applyForce(), CRotParticle::applyMoment(), cross(), CRotParticle::getAngVel(), CBasicParticle::getPos(), CBasicParticle::getRad(), CParticle::getVel(), m_cpos, m_dt, m_E_diss, m_Ffric, m_force_deficit, m_is_slipping, m_is_touching, m_k, m_ks, m_mu_d, m_mu_s, m_normal_force, ARotPairInteraction::m_p1, ARotPairInteraction::m_p2, and Vec3::norm().

Referenced by calcForces().

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double CRotFrictionInteraction::Count ( ) const

virtual

return 1 if particles are in contact, 0 otherwise

References m_is_touching.

Referenced by getScalarFieldFunction().

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double CRotFrictionInteraction::getAbsForceDeficit ( ) const

get the force needed to overcome friction and make the interaction slip

References m_force_deficit, and Vec3::norm().

Referenced by getScalarFieldFunction().

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double CRotFrictionInteraction::getAbsSlip ( ) const

Return distance slipped at the contact in the current time step. Returns 0 if interaction is sticking or if particles are not in contact.

References cross(), CRotParticle::getAngVel(), CBasicParticle::getPos(), CParticle::getVel(), m_cpos, m_dt, m_is_slipping, m_is_touching, ARotPairInteraction::m_p1, ARotPairInteraction::m_p2, Vec3::norm(), and Vec3::norm2().

Referenced by getScalarFieldFunction().

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CRotFrictionInteraction::CheckedScalarFieldFunction CRotFrictionInteraction::getCheckedScalarFieldFunction ( const string & name )

static

References NULL.

double CRotFrictionInteraction::getDissipatedEnergy ( ) const

return the amount of energy dissipated during the last time step

References m_E_diss.

Referenced by getScalarFieldFunction().

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Vec3 CRotFrictionInteraction::getForce ( ) const

If the particles are in contact, get total force, if not in contact return (0,0,0)

References m_Ffric, m_is_touching, and m_normal_force.

Referenced by getVectorFieldFunction().

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Vec3 CRotFrictionInteraction::getNormalForce ( ) const

If the particles are in contact, get normal force, if not in contact return (0,0,0)

References m_is_touching, and m_normal_force.

Referenced by getVectorFieldFunction().

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virtual Vec3 CRotFrictionInteraction::getPos ( ) const

inlinevirtual

Implements ARotPairInteraction.

References m_cpos.

double CRotFrictionInteraction::getPotentialEnergy ( ) const

get the potential energy stored in the interaction

Warning: For performance reasons the tangential part of the elastic energy is calculated directly from the current tangential force whereas it would be more accurate to calculate it incrementally during the force calculation. Be aware that therefore the potential energy is an approximation. Tests suggest an accuracy of a few percent.

References m_Ffric, m_k, m_ks, and m_normal_force.

Referenced by getScalarFieldFunction().

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CRotFrictionInteraction::ScalarFieldFunction CRotFrictionInteraction::getScalarFieldFunction ( const string & name )

static

Get the particle member function which returns a scalar field of a given name.

Parameters

name	the name of the field

References Count(), getAbsForceDeficit(), getAbsSlip(), getDissipatedEnergy(), getPotentialEnergy(), getSlipping(), getSticking(), and NULL.

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double CRotFrictionInteraction::getSlipping ( ) const

Get the static/dynamic status of the interaction. Returns 1 for a contact in dynamic friction, 0 for static or no contact

References m_is_slipping.

Referenced by getScalarFieldFunction().

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double CRotFrictionInteraction::getSticking ( ) const

Get "sticking" contacts, i.e. return 1 if the contact is touching but not slipping, 0 otherwise

References m_is_slipping, and m_is_touching.

Referenced by getScalarFieldFunction().

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Vec3 CRotFrictionInteraction::getTangentialForce ( ) const

References m_Ffric, and m_is_touching.

Referenced by getVectorFieldFunction().

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static string CRotFrictionInteraction::getType ( )

inlinestatic

CRotFrictionInteraction::VectorFieldFunction CRotFrictionInteraction::getVectorFieldFunction ( const string & name )

static

Get the particle member function which returns a vector field of a given name.

Parameters

name	the name of the field

References getForce(), getNormalForce(), getTangentialForce(), and NULL.

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bool CRotFrictionInteraction::isPersistent ( )

virtual

References CBasicParticle::getPos(), CBasicParticle::getRad(), ARotPairInteraction::m_p1, and ARotPairInteraction::m_p2.

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void CRotFrictionInteraction::loadRestartData ( std::istream & iStream )

virtual

Load restart data from an open istream

Parameters

iStream the input stream

Reimplemented from ARotPairInteraction.

References m_dt, m_Ffric, AInteraction::m_id, m_is_slipping, m_is_touching, m_k, m_ks, m_meanR_scaling, m_mu_d, m_mu_s, m_r0, m_scaling, Vec3::X(), Vec3::Y(), and Vec3::Z().

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void CRotFrictionInteraction::saveRestartData ( std::ostream & oStream )

virtual

Save restart data to an open ostream

Parameters

oStream the output stream

Reimplemented from ARotPairInteraction.

References m_dt, m_Ffric, AInteraction::m_id, m_is_slipping, m_is_touching, m_k, m_ks, m_meanR_scaling, m_mu_d, m_mu_s, m_r0, m_scaling, Vec3::X(), Vec3::Y(), and Vec3::Z().

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void CRotFrictionInteraction::setTimeStepSize ( double dt )

References m_dt.

Friends And Related Function Documentation

ostream& operator<<	(	ostream &	ost,
		const CRotFrictionInteraction &	BI
	)

friend

friend class TML_PackedMessageInterface

friend

Member Data Documentation

Vec3 CRotFrictionInteraction::m_cpos

private

contact position

Referenced by calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), getAbsSlip(), and getPos().

double CRotFrictionInteraction::m_dt

private

time step

Referenced by calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), getAbsSlip(), loadRestartData(), saveRestartData(), and setTimeStepSize().

double CRotFrictionInteraction::m_E_diss

private

dissipated energy

Referenced by calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), and getDissipatedEnergy().

Vec3 CRotFrictionInteraction::m_Ffric

private

current frictional force

Referenced by calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), getForce(), getPotentialEnergy(), getTangentialForce(), loadRestartData(), and saveRestartData().

Vec3 CRotFrictionInteraction::m_force_deficit

private

difference between fric. force & force necessary for slip

Referenced by calcRigidBodyForces(), calcSimpleForces(), and getAbsForceDeficit().

bool CRotFrictionInteraction::m_is_slipping

private

static/dynamic status of the interaction

Referenced by calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), getAbsSlip(), getSlipping(), getSticking(), loadRestartData(), and saveRestartData().

bool CRotFrictionInteraction::m_is_touching

private

contact status of the interaction

Referenced by calcRigidBodyForces(), calcSimpleForces(), Count(), CRotFrictionInteraction(), getAbsSlip(), getForce(), getNormalForce(), getSticking(), getTangentialForce(), loadRestartData(), and saveRestartData().

double CRotFrictionInteraction::m_k

private

spring constant

Referenced by calcNormalForce(), calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), getPotentialEnergy(), loadRestartData(), and saveRestartData().

double CRotFrictionInteraction::m_ks

private

shear stiffness (Cundall)

Referenced by calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), getPotentialEnergy(), loadRestartData(), and saveRestartData().

bool CRotFrictionInteraction::m_meanR_scaling

private

toggles whether to use the mean particle radius or minimum particle radius to define bond radius

Referenced by CRotFrictionInteraction(), loadRestartData(), and saveRestartData().

double CRotFrictionInteraction::m_mu_d

private

coefficient of dynamic friction

Referenced by calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), loadRestartData(), and saveRestartData().

double CRotFrictionInteraction::m_mu_s

private

coefficient of static friction

Referenced by calcRigidBodyForces(), calcSimpleForces(), CRotFrictionInteraction(), loadRestartData(), and saveRestartData().

Vec3 CRotFrictionInteraction::m_normal_force

private

current normal force

Referenced by calcNormalForce(), calcRigidBodyForces(), calcSimpleForces(), getForce(), getNormalForce(), and getPotentialEnergy().

double CRotFrictionInteraction::m_r0

private

equilibrium distance

Referenced by CRotFrictionInteraction(), loadRestartData(), and saveRestartData().

bool CRotFrictionInteraction::m_rigid

private

toggles whether to use rigid body friction interactions

Referenced by calcForces(), and CRotFrictionInteraction().

bool CRotFrictionInteraction::m_scaling

private

toggles scaling of elastic properties by particle size

Referenced by CRotFrictionInteraction(), loadRestartData(), and saveRestartData().

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

Model/RotFricInteraction.h
Model/RotFricInteraction.cpp

Public Types

Public Member Functions

Static Public Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation