SphericalIndenter.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 SPHERICALINDENTER_H
#define SPHERICALINDENTER_H
 
#include "Mercury3D.h"
//#include <assert.h>
#include "Logger.h"
 
class SphericalIndenter : public Mercury3D
{
public:
 
    SphericalIndenter(Mdouble indenterDiameter, Mdouble indentationVelocity, Mdouble indentationForce)
    : indenterDiameter_(indenterDiameter), indentationVelocity_(indentationVelocity),
    indentationForce_(indentationForce)
    {
        logger(INFO, "Creating indenter with"
                     " diameter %"
                     " force %"
                     " velocity %", indenterDiameter_, indentationForce_, indentationVelocity_);
        logger.assert_always(indenterDiameter_ >= 0.0, "");
        logger.assert_always(indentationVelocity_ >= 0.0, "");
        logger.assert_always(indentationForce_ >= 0.0, "");
    }
 
    void setupInitialConditions() override
    {
        logger(VERBOSE, "Setting up indenter\n");
    
        indenter_.setHandler(&particleHandler);
        indenter_.setRadius(0.5 * indenterDiameter_);
        indenter_.setSpecies(speciesHandler.getLastObject());
        indenter_.fixParticle();
        indenter_.setIndex(particleHandler.getNumberOfObjects());
        indenter_.setId(particleHandler.getNumberOfObjects());
        setIndenterVelocity(-10.0 * indentationVelocity_);
        logger(INFO, "Indentation Velocity %", getIndenterVelocity());
    
        setIndenterHeight(getBedHeight());
    
        logger(INFO, "%\nH%\nH%\nH%", indenter_, getIndenterHeight(), indenter_.getIndex(), indenter_.getId());
    }
 
    Mdouble getIndentationForce() const
    {
        return indentationForce_;
    }
    
    void setIndentationForce(Mdouble indentationForce)
    {
        indentationForce_=indentationForce;
    }
 
    Mdouble getIndenterHeight() const
    {
        return indenter_.getPosition().Z - indenter_.getRadius();
    }
    
    void setIndenterHeight(Mdouble height)
    {
        indenter_.setPosition(Vec3D(0.5 * (getXMax() + getXMin()),
                                    0.5 * (getYMax() + getYMin()),
                                    height+indenter_.getRadius()));
    }
 
    Mdouble getForceOnIndenter() const
    {
        return indenter_.getForce().Z;
    }
 
    void setIndenterVelocity(Mdouble indentationVelocity_)
    {
        indenter_.setVelocity({0, 0, indentationVelocity_});
    }
 
    Mdouble getIndenterVelocity() const
    {
        return indenter_.getVelocity().Z;
    }
    
    void computeExternalForces(BaseParticle* p) override
    {
        DPMBase::computeExternalForces(p);
        if (!p->isFixed())
            computeInternalForce(p, &indenter_);
    }
 
    void actionsBeforeTimeStep() override
    {
        indenter_.resetForceTorque(getNumberOfOMPThreads());
    }
 
    void outputXBallsData(std::ostream& os) const override
    {
        // adds one line to the particle data
        os << particleHandler.getNumberOfObjects() + 1 << " " << getTime() << " "
            << getXMin() << " " << getYMin() << " " << getZMin() << " "
            << getXMax() << " " << getYMax() << " " << getZMax() << " " << std::endl;
        // This outputs the particle data
        for (unsigned int i = 0; i < particleHandler.getNumberOfObjects(); i++)
            outputXBallsDataParticle(i, 14, os);
 
        os  << indenter_.getPosition() << " "
            << indenter_.getVelocity() << " "
            << indenter_.getRadius() << "  0 0 0 0 0 0 0\n";
    }
    
    void actionsBeforeTimeLoop() override
    {
        logger(INFO, "time\t"
                     "displacement\t"
                     "relForce\t"
                     "direction\t"
                     "eneRatio");
    }
    
    void printTime() const override
    {
        //writeEneTimeStep(std::cout);
        logger(INFO, "%.11\t"
                     "%.11\t"
                     "%.11\t"
                     "%.9\t"
                     "%.11", getTime(), getIndenterHeight(), getForceOnIndenter() / indentationForce_,
               (getIndenterVelocity() < 0 ? "down" : (getIndenterVelocity() == 0 ? "stop" : "up")),
               getKineticEnergy() / getElasticEnergy());
    }
 
    void writeEneHeader(std::ostream& os) const override
    {
        os << "time\tdisplacement\tforce\tdirection\n";
    }
 
    void writeEneTimeStep(std::ostream& os) const override
    {
        os << std::setw(12) << getTime()
            << "\t" << std::setw(12)<< getIndenterHeight()
            << "\t" << std::setw(12) << getForceOnIndenter()/ indentationForce_
            << "\t" << (getIndenterVelocity()<0?"down":(getIndenterVelocity()==0?"stop":"up"))
            << std::endl;
//        os << "t " << getTime()
//            << " \t " << (getIndenterVelocity()<0?"down":"up")
//            << "\tz " << getIndenterHeight()
//            << "\trelForce " << getForceOnIndenter() / indentationForce_ << std::endl;
    }
 
    void actionsAfterTimeStep() override
    {
        indenter_.sumForceTorqueOMP();
        
        static Mdouble timeToRetract = 0;
        indenter_.move(indenter_.getVelocity() * getTimeStep());
 
        if (getIndenterVelocity() < 0)
        { //moving down
            if (getForceOnIndenter() > 0 && getIndenterVelocity()!=-indentationVelocity_)
            {
                setIndenterVelocity(-indentationVelocity_);
                logger(INFO, "Lowering indentation velocity %", getIndenterVelocity());
            }
            if (getForceOnIndenter() >= indentationForce_)
            {
                setIndenterVelocity(0);
                timeToRetract = 1.1 * getTime();
                logger(INFO, "stopping indenter");
            }
        }
        else if (getIndenterVelocity() == 0) 
        { //stopping
            if (getTime()>timeToRetract) {
                setIndenterVelocity(indentationVelocity_);
                logger(INFO, "retracting indenter");
                measuredIndentationForce = getForceOnIndenter();
                measuredIndentation = getIndenterHeight();
            }        
        } else 
        { //retracting
            if (measuredForceGradient==0 && getForceOnIndenter() < 0.5*measuredIndentationForce)
            {
                measuredForceGradient = (0.5 * measuredIndentationForce) / (getIndenterHeight() - measuredIndentation);
                logger(INFO, "measured force gradient = %", measuredForceGradient);
            } else if (getForceOnIndenter() > 0)
            {
                //logger(INFO, "stopping indenter");
                setTimeMax(getTime() * 1.2);
            }
            else if (measuredElasticDisplacement == 0)
            {
                measuredElasticDisplacement = getIndenterHeight() - measuredIndentation;
                logger(INFO, "measured elastic displacement = %\n"
                             "measured Elasticity = %", measuredElasticDisplacement, Flusher::NO_FLUSH,
                       0.5 * measuredForceGradient / sqrt(0.5 * indenterDiameter_ * measuredElasticDisplacement));
                setIndenterVelocity(10.0 * indentationVelocity_);
                logger(INFO, "Increasing indentation velocity %", getIndenterVelocity());
            }
        }
    }
 
    Mdouble getBedHeight()
    {
        Mdouble bedHeight = getZMin();
        for (auto p : particleHandler)
            if (!p->isFixed())
                bedHeight = std::max(bedHeight, p->getPosition().Z + p->getRadius());
        logger(INFO, "bed height % N=%", bedHeight, particleHandler.getNumberOfObjects());
        //return 1;
        return bedHeight;
    }
 
private:
    SphericalParticle indenter_;
    Mdouble indenterDiameter_;
    Mdouble indentationVelocity_;
    Mdouble indentationForce_;
    
    Mdouble measuredIndentationForce = 0;
    Mdouble measuredIndentation = 0;
    Mdouble measuredForceGradient = 0;
    Mdouble measuredElasticDisplacement = 0;
    
};
 
#endif  /* SPHERICALINDENTER_H */