FreeCooling3DDemo.cpp

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//Copyright (c) 2013-2014, The MercuryDPM Developers Team. All rights reserved.
//For the list of developers, see <http://www.MercuryDPM.org/Team>.
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#include<iostream>
#include <Species/LinearViscoelasticSpecies.h>

#include "Mercury3D.h"
#include "Particles/BaseParticle.h"
#include "Walls/InfiniteWall.h"
#include "MercuryTime.h"

class FreeCooling3DDemoProblem : public Mercury3D
{
public:
    
    void setupInitialConditions()
    {
        unsigned int N1 = static_cast<unsigned int>(pow(N, 0.33)) + 1;  
        BaseParticle p0;        
        for (unsigned int i = 0; i < N; i++)
        {
            unsigned int ix = static_cast<unsigned int>(i%N1);
            unsigned int iz = static_cast<unsigned int>(i/N1/N1);
            unsigned int iy = (i - ix - N1 * N1 * iz) / N1;
        
            double x = (getXMax() - getXMin()) * (ix + 1) / (N1 + 1);
            double y = (getYMax() - getYMin()) * (iy+1) / (N1 + 1);
            double z = (getZMax() - getZMin()) * (iz + 1) / (N1 + 1);
            
            p0.setPosition(Vec3D(x,y,z));
            p0.setVelocity(20*Vec3D(0.1,0.1,0.1));
            p0.setRadius(0.002);
            particleHandler.copyAndAddObject(p0);
        }
        
        wallHandler.clear();
        InfiniteWall w0;
        w0.set(Vec3D(-1.0, 0.0, 0.0), Vec3D(getXMin(), 0, 0));
        wallHandler.copyAndAddObject(w0);
        w0.set(Vec3D(1.0, 0.0, 0.0), Vec3D(getXMax(), 0, 0));
        wallHandler.copyAndAddObject(w0);
        w0.set(Vec3D(0.0,-1.0, 0.0), Vec3D(0, getYMin(), 0));
        wallHandler.copyAndAddObject(w0);
        w0.set(Vec3D(0.0, 1.0, 0.0), Vec3D(0, getYMax(), 0));
        wallHandler.copyAndAddObject(w0);
        w0.set(Vec3D(0.0, 0.0,-1.0), Vec3D(0, 0, getZMin()));
        wallHandler.copyAndAddObject(w0);
        w0.set(Vec3D(0.0, 0.0, 1.0), Vec3D(0, 0, getZMax()));
        wallHandler.copyAndAddObject(w0);
    }
    
    unsigned int N;
};

int main(int argc UNUSED, char *argv[] UNUSED)
{
    std::cout << "In this file 10^3 particles with the same velocity are placed "
    "in a tri-axial box. This makes them collide with the walls and eachother. "
    "Afterwards the same run is performed with hgrid on. It tests the working "
    "(and speedup) of the hgrid." << std::endl;
    
    Time time;
    time.tic();
    FreeCooling3DDemoProblem problem;
    auto species = new LinearViscoelasticSpecies;
    problem.speciesHandler.addObject(species);
    species->setDensity(2000);
    species->setDissipation(0.005);
    species->setStiffness(1e3);

    problem.setXMax(0.1);
    problem.setYMax(0.1);
    problem.setZMax(0.1);
    problem.N=1000;
    problem.setName("FreeCooling3DDemo");
    problem.setGravity(Vec3D(0.0,0.0,0.0));
    problem.setTimeStep(5e-5);
    problem.setSaveCount(4);
    problem.setTimeMax(0.08);
    problem.setSystemDimensions(3);
    
    problem.setHGridMaxLevels(1);
    problem.setHGridCellOverSizeRatio(1.2);
    problem.setHGridUpdateEachTimeStep(false);    
    problem.solve();
    
    std::cout << "Total time to run this simulation: " << time.toc() << "s" << std::endl;
}