HertzianViscoelasticNormalSpecies Class Reference

HertzianViscoelasticNormalSpecies contains the parameters used to describe a Hertzian normal force (The Mindlin model). More...

#include <HertzianViscoelasticNormalSpecies.h>

Inheritance diagram for HertzianViscoelasticNormalSpecies:

Public Types
typedef HertzianViscoelasticInteraction	InteractionType
	The correct Interaction type for this FrictionForceSpecies. More...

Public Member Functions
	HertzianViscoelasticNormalSpecies ()
	The default constructor. More...
	HertzianViscoelasticNormalSpecies (const HertzianViscoelasticNormalSpecies &p)
	The default copy constructor. More...
	~HertzianViscoelasticNormalSpecies ()
	The default destructor. More...
void	read (std::istream &is)
	Reads the species properties from an input stream. More...
void	write (std::ostream &os) const
	Writes the species properties to an output stream. More...
virtual std::string	getBaseName () const
	Used in Species::getName to obtain a unique name for each Species. More...
Mdouble	getCollisionTime (Mdouble particleDiameter, Mdouble particleDensity, Mdouble relativeVelocity) const
	Used in Species::getName to obtain a unique name for each Species. More...
Public Member Functions inherited from BaseNormalForce
	BaseNormalForce ()
	BaseNormalForce (const BaseNormalForce &p)
bool	getConstantRestitution () const
void	setConstantRestitution (bool constantRestitution)
virtual void	actionsAfterTimeStep (BaseParticle *particle) const
Public Member Functions inherited from BaseForce
BaseSpecies *	getBaseSpecies () const
void	setBaseSpecies (BaseSpecies *baseSpecies)

Detailed Description

HertzianViscoelasticNormalSpecies contains the parameters used to describe a Hertzian normal force (The Mindlin model).

See HertzianViscoelasticNormalInteraction::computeForce for a description of the force law.

Member Typedef Documentation

InteractionType

typedef HertzianViscoelasticInteraction HertzianViscoelasticNormalSpecies::InteractionType

The correct Interaction type for this FrictionForceSpecies.

Constructor & Destructor Documentation

HertzianViscoelasticNormalSpecies() [1/2]

HertzianViscoelasticNormalSpecies::HertzianViscoelasticNormalSpecies

(

)

The default constructor.

        : BaseNormalForce()
{
    elasticModulus_ = 0;
    dissipation_ = 0;
#ifdef DEBUG_CONSTRUCTOR
    std::cout<<"HertzianViscoelasticNormalSpecies::HertzianViscoelasticNormalSpecies() finished"<<std::endl;
#endif
}

HertzianViscoelasticNormalSpecies() [2/2]

HertzianViscoelasticNormalSpecies::HertzianViscoelasticNormalSpecies

(

const HertzianViscoelasticNormalSpecies &

p

)

The default copy constructor.

Parameters

[in]

the

species that is copied

        : BaseNormalForce(p)
{
    elasticModulus_ = p.elasticModulus_;
    dissipation_ = p.dissipation_;
#ifdef DEBUG_CONSTRUCTOR
    std::cout<<"HertzianViscoelasticNormalSpecies::HertzianViscoelasticNormalSpecies(const HertzianViscoelasticNormalSpecies &p) finished"<<std::endl;
#endif
}

~HertzianViscoelasticNormalSpecies()

HertzianViscoelasticNormalSpecies::~HertzianViscoelasticNormalSpecies

(

)

The default destructor.

{
#ifdef DEBUG_DESTRUCTOR
    std::cout<<"HertzianViscoelasticNormalSpecies::~HertzianViscoelasticNormalSpecies() finished"<<std::endl;
#endif
}

Member Function Documentation

getBaseName()

std::string HertzianViscoelasticNormalSpecies::getBaseName ( ) const

virtual

Used in Species::getName to obtain a unique name for each Species.

Returns

a string containing the name of the species (minus the word "Species")

Reimplemented in HertzianBSHPViscoelasticNormalSpecies.

{
    return "HertzianViscoelastic";
}

getCollisionTime()

Mdouble HertzianViscoelasticNormalSpecies::getCollisionTime	(	Mdouble	particleDiameter,
		Mdouble	particleDensity,
		Mdouble	relativeVelocity
	)		const

Used in Species::getName to obtain a unique name for each Species.

Parameters

[in]	relativeVelocity	input the maximum relative velocity in your system to get the mininimum collision time
[in]	particleDiameter	input the minimum particle diameter in your system to get the mininimum collision time
[in]	particleDensity	input the minimum particle density in your system to get the mininimum collision time

{
    // Here is a very nice paper describing contact modelling
    // http://people.ds.cam.ac.uk/jae1001/CUS/research/pfizer/Antypov_Elliott_EPL_2011.pdf
    //caution: this function assumes the contact is elastic (no dissipation)
    //Mdouble omega0 = 2.0/constants::sqrt_pi*sqrt(getEffectiveElasticModulus()/particleDensity)/relativeVelocity;
    //Mdouble omega1 = sqrt(omega0*omega0-getDissipation()*getDissipation());
    return 2.214 * pow(mathsFunc::square(particleDensity / getEffectiveElasticModulus()) / relativeVelocity, 0.2) *
           particleDiameter;
}

References mathsFunc::square().

read()

void HertzianViscoelasticNormalSpecies::read

(

std::istream &

is

)

Reads the species properties from an input stream.

Parameters

[in]

input

stream (typically the restart file)

{
    std::string dummy;
    is >> dummy >> elasticModulus_
       >> dummy >> dissipation_;
}

write()

void HertzianViscoelasticNormalSpecies::write

(

std::ostream &

os

)

const

Writes the species properties to an output stream.

Parameters

[out]

output

stream (typically the restart file)

{
    os << " elasticModulus " << elasticModulus_
       << " dissipation " << dissipation_;
}

---

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

• HertzianViscoelasticNormalSpecies.h
• HertzianViscoelasticNormalSpecies.cc