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colone_weight.cc
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colone_weight.cc
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/**
* @file colone_weight.cc
*
* @author David Simon Kammer <david.kammer@epfl.ch>
* @author Alodie Schneuwly <alodie.schneuwly@epfl.ch>
*
* @date creation: Mon Aug 09 2010
* @date last modification: Thu Aug 06 2015
*
* @brief column test
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014, 2015 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"
/* -------------------------------------------------------------------------- */
using namespace akantu;
int main(int argc, char *argv[]) {
// chose if you use hexahedron elements
bool use_hexa = false;
std::stringstream mesh_file;
std::stringstream output;
std::stringstream energy_file;
akantu::ElementType type;
UInt vel_damping_interval;
if (use_hexa) {
type = akantu::_hexahedron_8;
mesh_file << "colone_hexa.msh";
output << "paraview/test_weight_hexa";
energy_file << "energy_hexa.csv";
vel_damping_interval =4;
}
else {
type = akantu::_tetrahedron_4;
mesh_file << "colone_tetra.msh";
output << "paraview/test_weight_tetra";
energy_file << "energy_tetra.csv";
vel_damping_interval = 8;
}
akantu::UInt spatial_dimension = 3;
akantu::UInt max_steps = 2000;
akantu::Real time_factor = 0.8;
akantu::initialize("material_colone.dat", argc, argv);
// akantu::Real epot, ekin;
akantu::Mesh mesh(spatial_dimension);
mesh.read(mesh_file.str().c_str());
akantu::SolidMechanicsModel model(mesh);
akantu::UInt nb_nodes = mesh.getNbNodes();
akantu::UInt nb_element = mesh.getNbElement(type);
std::cout << "Nb nodes : " << nb_nodes << " - nb elements : " << nb_element << std::endl;
/// model initialization
model.initFull();
std::cout << model.getMaterial(0) << std::endl;
model.assembleMassLumped();
/// boundary conditions
const akantu::Array<Real> & position = model.getFEEngine().getMesh().getNodes();
akantu::Array<bool> & boundary = model.getBlockedDOFs();
akantu::Array<Real> & force = model.getForce();
const akantu::Array<Real> & mass = model.getMass();
akantu::Real z_min = position(0, 2);
for (unsigned int i = 0; i < nb_nodes; ++i) {
if(position(i, 2) < z_min)
z_min = position(i, 2);
}
akantu::Real eps = 1e-13;
for (akantu::UInt i = 0; i < nb_nodes; ++i) {
if(fabs(position(i, 2) - z_min) <= eps)
boundary(i,2) = true;
else
force(i,2) = -mass(i,0) * 9.81;
}
akantu::Real time_step = model.getStableTimeStep() * time_factor;
std::cout << "Time Step = " << time_step << "s" << std::endl;
model.setTimeStep(time_step);
model.updateResidual();
model.setBaseName("colonne_weight");
model.addDumpField("displacement");
model.addDumpField("mass" );
model.addDumpField("velocity" );
model.addDumpField("acceleration");
model.addDumpField("force" );
model.addDumpField("residual" );
model.addDumpField("damage" );
model.addDumpField("stress" );
model.addDumpField("strain" );
model.dump();
akantu::Array<Real> & velocity = model.getVelocity();
std::ofstream energy;
energy.open(energy_file.str().c_str());
energy << "id,epot,ekin,tot" << std::endl;
for(akantu::UInt s = 1; s <= max_steps; ++s) {
model.explicitPred();
model.updateResidual();
model.updateAcceleration();
model.explicitCorr();
akantu::Real epot = model.getEnergy("potential");
akantu::Real ekin = model.getEnergy("kinetic");
energy << s << "," << epot << "," << ekin << "," << epot + ekin
<< std::endl;
if (s % vel_damping_interval == 0) {
for (akantu::UInt i = 0; i < nb_nodes; ++i) {
velocity(i, 0) *= 0.9;
velocity(i, 1) *= 0.9;
velocity(i, 2) *= 0.9;
}
}
if(s % 1 == 0) model.dump();
if(s % 10 == 0) std::cout << "passing step " << s << "/" << max_steps << std::endl;
}
akantu::finalize();
return EXIT_SUCCESS;
}

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