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test_solid_mechanics_model_bar_traction2d_structured_pbc.cc
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test_solid_mechanics_model_bar_traction2d_structured_pbc.cc
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/**
* @file test_solid_mechanics_model_bar_traction2d_structured_pbc.cc
*
* @author David Simon Kammer <david.kammer@epfl.ch>
*
* @date creation: Thu Dec 22 2011
* @date last modification: Mon Jun 23 2014
*
* @brief test of pbc class for SolidMechanicsModel
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include <limits>
#include <fstream>
#include <iostream>
/* -------------------------------------------------------------------------- */
#include "solid_mechanics_model.hh"
/* -------------------------------------------------------------------------- */
int main(int argc, char *argv[])
{
akantu::debug::setDebugLevel(akantu::dblWarning);
akantu::initialize("material.dat", argc, argv);
akantu::UInt spatial_dimension = 2;
akantu::UInt max_steps = 1000;
akantu::Real time_factor = 0.2;
akantu::Real epot, ekin;
akantu::Mesh mesh(spatial_dimension);
mesh.read("bar_structured1.msh");
akantu::SolidMechanicsModel model(mesh);
/// model initialization
model.initFull();
std::cout << model.getMaterial(0) << std::endl;
model.setPBC(1,0,0);
model.initPBC();
model.assembleMassLumped();
model.setBaseName("bar2d_structured_pbc");
model.addDumpField("displacement");
model.addDumpField("mass" );
model.addDumpField("velocity" );
model.addDumpField("acceleration");
model.addDumpField("force" );
model.addDumpField("residual" );
model.addDumpField("stress" );
model.addDumpField("strain" );
model.dump();
akantu::UInt nb_nodes = mesh.getNbNodes();
/// boundary conditions
mesh.computeBoundingBox();
akantu::Real eps = 1e-16;
akantu::Real signal_start = 0.6*mesh.getUpperBounds()(0);
akantu::Real signal_end = 0.7*mesh.getUpperBounds()(0);
akantu::Real delta_d = signal_end - signal_start;
akantu::Real signal = 1.;
const akantu::Array<akantu::Real> & coords = model.getFEEngine().getMesh().getNodes();
akantu::Array<akantu::Real> & disp = model.getDisplacement();
for (akantu::UInt i = 0; i < nb_nodes; ++i) {
if(coords(i,0) >= signal_start && coords(i,0) <= signal_end) {
if (coords(i,0) <= 0.5 * (signal_start + signal_end))
disp(i,0) = (coords(i,0) - signal_start) * 2 * signal / delta_d;
else
disp(i,0) = (signal_end - coords(i,0)) * 2 * signal / delta_d;
}
if(coords(i,1) <= eps || coords(i,1) >= 1 - eps ) {
model.getBlockedDOFs().storage()[spatial_dimension*i + 1] = true;
}
}
akantu::Real time_step = model.getStableTimeStep() * time_factor;
std::cout << "Time Step = " << time_step << "s" << std::endl;
model.setTimeStep(time_step);
std::ofstream energy;
energy.open("energy_2d_pbc.csv");
energy << "id,epot,ekin,tot" << std::endl;
for(akantu::UInt s = 1; s <= max_steps; ++s) {
model.explicitPred();
model.updateResidual();
model.updateAcceleration();
model.explicitCorr();
epot = model.getPotentialEnergy();
ekin = model.getKineticEnergy();
if(s % 20 == 0) model.dump();
std::cerr << "passing step " << s << "/" << max_steps << std::endl;
energy << s << "," << epot << "," << ekin << "," << epot + ekin
<< std::endl;
}
energy.close();
return EXIT_SUCCESS;
}

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