HertzianViscoElasticInteraction.h

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//                                                         //
// Copyright (c) 2003-2013 by The University of Queensland //
// Earth Systems Science Computational Centre (ESSCC)      //
// http://www.uq.edu.au/esscc                              //
//                                                         //
// Primary Business: Brisbane, Queensland, Australia       //
// Licensed under the Open Software License version 3.0    //
// http://www.opensource.org/licenses/osl-3.0.php          //
//                                                         //

#ifndef __HERTZIANVISCOELASTICINTERACTION_H
#define __HERTZIANVISCOELASTICINTERACTION_H

#include "Model/IGParam.h"
#include "Model/Interaction.h"
#include "Model/Particle.h"


class CHertzianViscoElasticIGP : public AIGParam
{
public:
  double m_A;
  double m_E;
  double m_nu; // poisson ratio

  CHertzianViscoElasticIGP();
  CHertzianViscoElasticIGP(const std::string&,double,double,double);
  
  virtual std::string getTypeString() const {return "HertzianViscoElastic";}
};

class CHertzianViscoElasticInteraction : public APairInteraction
{
public:

  typedef
    double (CHertzianViscoElasticInteraction::* ScalarFieldFunction)() const;
  typedef
    Vec3 (CHertzianViscoElasticInteraction::* VectorFieldFunction)() const;
  typedef 
    pair<bool,double>
    (CHertzianViscoElasticInteraction::* CheckedScalarFieldFunction)() const;

  static ScalarFieldFunction getScalarFieldFunction(const string&);
  static VectorFieldFunction getVectorFieldFunction(const string&);
  static CheckedScalarFieldFunction getCheckedScalarFieldFunction(
    const string&
  );

private:
  double m_A;
  double m_E;
  double m_nu; 
  Vec3   m_force; // caching force for E_pot
  double m_dn; // caching displacement for E_pot
  Vec3   m_cpos; // center position

public:
  typedef CHertzianViscoElasticIGP ParameterType;

  CHertzianViscoElasticInteraction(
    CParticle*,
    CParticle*,
    const CHertzianViscoElasticIGP&
  );
  virtual ~CHertzianViscoElasticInteraction(){};

  virtual Vec3 getPos() const {return m_cpos;};
  double getPotentialEnergy() const;

  virtual void calcForces();
  Vec3 getForce() const;
};
#endif //__HERTZIANVISCOELASTICINTERACTION_H