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/////////////////////////////////////////////////////////////
// //
// Copyright (c) 2003-2014 by The University of Queensland //
// Centre for Geoscience Computing //
// http://earth.uq.edu.au/centre-geoscience-computing //
// //
// Primary Business: Brisbane, Queensland, Australia //
// Licensed under the Open Software License version 3.0 //
// http://www.apache.org/licenses/LICENSE-2.0 //
// //
/////////////////////////////////////////////////////////////
#include "ElasticInteraction.h"
#include "console.h"
CElasticIGP::CElasticIGP():AIGParam(), m_k(0.0)
{}
CElasticIGP::CElasticIGP(const std::string& name,double kn, bool scaling)
: AIGParam(name), m_k(kn), m_scaling(scaling)
{}
CElasticInteraction::CElasticInteraction(
CParticle* p1,
CParticle* p2,
const CElasticIGP& param
)
: APairInteraction(p1,p2)
{
double effR=1.0;
double effA=1.0;
double effL=1.0; // effective radius, cross section and length of the interaction for scaling
// equilibrium distance
double r0=p1->getRad()+p2->getRad();
m_scaling = param.m_scaling;
// scale elastic param
if (m_scaling) {
if(!CParticle::getDo2dCalculations()){
effR=0.5*r0;
}
effL=r0;
effA = effR * effR;
}
m_k=param.m_k*effA/effL;
m_force=Vec3(0.0,0.0,0.0);
}
/*!
Calculate free elastic forces. 23 Flops if in contact, 10 Flops if not
*/
void CElasticInteraction::calcForces()
{
// console.XDebug() << "elastic interaction: [" << m_p1->getID() << " - " << m_p2->getID() << "]" << m_p1->getPos() << m_p2->getPos() << "\n";
Vec3 D=m_p1->getPos()-m_p2->getPos();
double dist=D*D;
double eq_dist=m_p1->getRad()+m_p2->getRad();
if(dist<(eq_dist*eq_dist)){
dist=sqrt(dist);
m_force=D*(m_k*(dist-eq_dist)/dist);
Vec3 pos=m_p2->getPos()+(m_p2->getRad()/eq_dist)*D;
m_p2->applyForce(m_force,pos);
m_p1->applyForce(-1.0*m_force,pos);
m_cpos=pos;
}
}
/*!
get the potential energy stored in the interaction
*/
double CElasticInteraction::getPotentialEnergy() const
{
double e_pot_norm=0.5*m_force*m_force/m_k;
return e_pot_norm;
}
Vec3 CElasticInteraction::getForce() const
{
return m_force;
}
/*!
Get the particle member function which returns a scalar field of a given name.
\param name the name of the field
*/
CElasticInteraction::ScalarFieldFunction CElasticInteraction::getScalarFieldFunction(const string& name)
{
CElasticInteraction::ScalarFieldFunction sf;
if (name=="potential_energy")
{
sf=&CElasticInteraction::getPotentialEnergy;
}
else if (name=="count")
{
sf=&CElasticInteraction::Count;
}
else
{
sf=NULL;
cerr << "ERROR - invalid name for interaction scalar access function" << endl;
}
return sf;
}
/*!
Get the particle member function which returns a checked scalar field of a given name.
\param name the name of the field
*/
CElasticInteraction::CheckedScalarFieldFunction CElasticInteraction::getCheckedScalarFieldFunction(const string& name)
{
CElasticInteraction::CheckedScalarFieldFunction sf;
sf=NULL;
cerr << "ERROR - invalid name for interaction scalar access function" << endl;
return sf;
}
/*!
Get the particle member function which returns a vector field of a given name.
\param name the name of the field
*/
CElasticInteraction::VectorFieldFunction CElasticInteraction::getVectorFieldFunction(const string& name)
{
CElasticInteraction::VectorFieldFunction vf;
if (name=="force"){
vf=&CElasticInteraction::getForce;
} else {
vf=NULL;
cerr << "ERROR - invalid name for interaction vector access function" << endl;
}
return vf;
}
/*!
save restart data to ostream
\param oStream the output stream
*/
void CElasticInteraction::saveRestartData(std::ostream &oStream)
{
oStream << m_id[0] << " ";
oStream << m_id[1] << " ";
oStream << m_init << " ";
oStream << m_k << " ";
oStream << m_scaling;
}
/*!
load restart data from stream
\param iStream the input stream
*/
void CElasticInteraction::loadRestartData(std::istream &iStream)
{
iStream >> m_id[0];
iStream >> m_id[1];
iStream >> m_init ;
iStream >> m_k;
iStream >> m_scaling;
}
ostream& operator<<(ostream& ost,const CElasticInteraction& BI)
{
ost << "[" << BI.m_p1->getID() << " - " << BI.m_p2->getID() << "]";
return ost;
}
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