FreeCoolingDemo.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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//  * Redistributions in binary form must reproduce the above copyright
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#include<iostream>
#include <Species/LinearViscoelasticSpecies.h>

#include "Mercury2D.h"
#include "Particles/BaseParticle.h"
#include "Walls/InfiniteWall.h"


class FreeCoolingDemoProblem : public Mercury2D{
public:
    
    void setupInitialConditions()
    {
        auto species = speciesHandler.copyAndAddObject(LinearViscoelasticSpecies());
        species->setDensity(2000);
        species->setDissipation(0.005);
        species->setStiffness(1e3);

        int N1=static_cast<int>(sqrt(N))+1;
        BaseParticle p0;
        for (int i=0;i<N;i++)
        {
            int ix=static_cast<int>(i%N1);
            int iy=static_cast<int>(i/N1);
            
            double x=(getXMax()-getXMin())*(ix+1)/(N1+1);
            double y=(getYMax()-getYMin())*(iy+1)/(N1+1);
            
            
            p0.setPosition(Vec3D(x,y,0.0));
            p0.setVelocity(Vec3D(0.1,0.1,0.0));
            p0.setRadius(0.0001);
            p0.setSpecies(species);
            particleHandler.copyAndAddObject(p0);
        }
        
        wallHandler.clear();
        InfiniteWall w0;
        w0.set(Vec3D(-1, 0, 0), Vec3D(getXMin(), 0, 0));
        wallHandler.copyAndAddObject(w0);
        w0.set(Vec3D( 1, 0, 0), Vec3D(getXMax(), 0, 0));
        wallHandler.copyAndAddObject(w0);
        w0.set(Vec3D( 0,-1, 0), Vec3D(0, getYMin(), 0));
        wallHandler.copyAndAddObject(w0);
        w0.set(Vec3D( 0, 1, 0), Vec3D(0, getYMax(), 0));
        wallHandler.copyAndAddObject(w0);
    }
    
    int N;
};

int main(int argc UNUSED, char *argv[] UNUSED)
{
    std::cout<<"In this file 32^2 particles with the same velocity are placed "
    "in a bi-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;   

    FreeCoolingDemoProblem problem;
    problem.setName("FreeCoolingDemo");

    problem.N=1024;
    problem.setGravity(Vec3D(0.0,0.0,0.0));
    problem.setTimeStep(5e-5);
    problem.setSaveCount(10);
    problem.setTimeMax(0.05);

    problem.setHGridMaxLevels(1);
    problem.setHGridCellOverSizeRatio(1.2);
    problem.setHGridUpdateEachTimeStep(false);
    problem.solve();
}