ThermalInteraction.h

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// This file is part of the MercuryDPM project (https://www.mercurydpm.org).
// Copyright (c), The MercuryDPM Developers Team. All rights reserved.
// License: BSD 3-Clause License; see the LICENSE file in the root directory.
 
#ifndef THERMALINTERACTION_H
#define THERMALINTERACTION_H
 
#include "Interactions/BaseInteraction.h"
#include "Particles/ThermalParticle.h"
 
template<class NormalForceSpecies>
class ThermalSpecies;
 
template<class NormalForceInteraction>
class ThermalInteraction : public NormalForceInteraction
{
public:
    typedef ThermalSpecies<typename NormalForceInteraction::SpeciesType> SpeciesType;
    
    ThermalInteraction(BaseInteractable* P, BaseInteractable* I, unsigned timeStamp);
    
    ThermalInteraction();
    
    ThermalInteraction(const ThermalInteraction& p);
    
    virtual ~ThermalInteraction();
    
    void computeNormalForce();
    
};
 
template<class NormalForceInteraction>
ThermalInteraction<NormalForceInteraction>::ThermalInteraction(BaseInteractable* P, BaseInteractable* I,
                                                               unsigned timeStamp)
        : BaseInteraction(P, I, timeStamp), NormalForceInteraction(P, I, timeStamp)
{}
 
template<class NormalForceInteraction>
ThermalInteraction<NormalForceInteraction>::ThermalInteraction()
        : BaseInteraction(), NormalForceInteraction()
{}
 
template<class NormalForceInteraction>
ThermalInteraction<NormalForceInteraction>::ThermalInteraction(const ThermalInteraction& p)
        : BaseInteraction(p), NormalForceInteraction(p)
{}
 
template<class NormalForceInteraction>
ThermalInteraction<NormalForceInteraction>::~ThermalInteraction()
{}
 
template<class NormalForceInteraction>
void ThermalInteraction<NormalForceInteraction>::computeNormalForce()
{
    NormalForceInteraction::computeNormalForce();
    Mdouble radius = 2.0 * NormalForceInteraction::getEffectiveRadius();
    Mdouble contactArea = constants::pi * radius * std::max(0.0,NormalForceInteraction::getOverlap());
    const SpeciesType* species = static_cast<const SpeciesType*>(NormalForceInteraction::getBaseSpecies()->getNormalForce());
    ThermalParticle* pParticle = dynamic_cast<ThermalParticle*>(NormalForceInteraction::getP());
    ThermalParticle* iParticle = dynamic_cast<ThermalParticle*>(NormalForceInteraction::getI());
    // if both p and i are particles
    if (pParticle && iParticle)
    {
        /* compute heat transfer rate due to heat conduction, Q=cond*dTemp*area/dist */
        Mdouble heatTransfer = species->getThermalConductivity()
                               * (pParticle->getTemperature() - iParticle->getTemperature())
                               * contactArea / NormalForceInteraction::getDistance();
        /* m*dT = Q/c*dt */
        Mdouble mdT = heatTransfer / species->getHeatCapacity()
            * NormalForceInteraction::getHandler()->getDPMBase()->getTimeStep();
        pParticle->addTemperature(-mdT * pParticle->getInvMass());
        iParticle->addTemperature(mdT * iParticle->getInvMass());
    }
}
 
#endif