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test_solid_mechanics_model_bar_traction2d_mass_not_lumped.cc
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Fri, Jun 21, 16:47
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rAKA akantu
test_solid_mechanics_model_bar_traction2d_mass_not_lumped.cc
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/**
* @file test_solid_mechanics_model.cc
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @date Tue Jul 27 14:34:13 2010
*
* @brief test of the class SolidMechanicsModel
*
* @section LICENSE
*
* Copyright (©) 2010-2011 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 "aka_common.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "mesh_io_msh.hh"
#include "solid_mechanics_model.hh"
#include "material.hh"
/* -------------------------------------------------------------------------- */
#ifdef AKANTU_USE_IOHELPER
# include "io_helper.hh"
#endif //AKANTU_USE_IOHELPER
using namespace akantu;
//#define CHECK_STRESS
akantu::ElementType type = akantu::_triangle_3;
#ifdef AKANTU_USE_IOHELPER
iohelper::ElemType paraview_type = iohelper::TRIANGLE1;
#endif //AKANTU_USE_IOHELPER
akantu::SolidMechanicsModel * model;
akantu::UInt spatial_dimension = 2;
akantu::UInt nb_nodes;
akantu::UInt nb_element;
akantu::Vector<akantu::Real> * lumped;
#ifdef AKANTU_USE_IOHELPER
static void paraviewInit(iohelper::Dumper & dumper);
static void paraviewDump(iohelper::Dumper & dumper);
#endif
int main(int argc, char *argv[])
{
akantu::initialize(argc, argv);
akantu::UInt max_steps = 5000;
akantu::Real time_factor = 0.8;
// akantu::Real epot, ekin;
akantu::Mesh mesh(spatial_dimension);
akantu::MeshIOMSH mesh_io;
mesh_io.read("bar1.msh", mesh);
model = new akantu::SolidMechanicsModel(mesh);
nb_nodes = model->getFEM().getMesh().getNbNodes();
nb_element = model->getFEM().getMesh().getNbElement(type);
lumped = new akantu::Vector<akantu::Real>(nb_nodes, spatial_dimension);
/// model initialization
model->initVectors();
/// set vectors to 0
model->getForce().clear();
model->getVelocity().clear();
model->getAcceleration().clear();
model->getDisplacement().clear();
model->initExplicit();
//model->initImplicit(true);
model->initModel();
model->readMaterials("material.dat");
std::cout << model->getMaterial(0) << std::endl;
model->initMaterials();
model->initSolver();
model->assembleMass();
// model->assembleStiffnessMatrix();
model->getMassMatrix().lump(*lumped);
/// boundary conditions
akantu::Real eps = 1e-16;
const akantu::Vector<akantu::Real> & pos = mesh.getNodes();
akantu::Vector<akantu::Real> & disp = model->getDisplacement();
akantu::Vector<bool> & boun = model->getBoundary();
for (akantu::UInt i = 0; i < nb_nodes; ++i) {
if(pos(i, 0) >= 9.) disp(i, 0) = (pos(i, 0) - 9) / 100.;
if(pos(i) <= eps) boun(i, 0) = true;
if(pos(i, 1) <= eps || pos(i, 1) >= 1 - eps ) boun(i, 1) = true;
}
/// set the time step
akantu::Real time_step = model->getStableTimeStep() * time_factor;
std::cout << "Time Step = " << time_step << "s" << std::endl;
model->setTimeStep(time_step);
model->updateResidual();
model->initialAcceleration();
#ifdef AKANTU_USE_IOHELPER
/// initialize the paraview output
iohelper::DumperParaview dumper;
paraviewInit(dumper);
#endif //AKANTU_USE_IOHELPER
std::ofstream energy;
energy.open("energy_bar_2d_not_lumped.csv");
energy << "id,rtime,epot,ekin,tot" << std::endl;
for(akantu::UInt s = 1; s <= max_steps; ++s) {
// model->implicitPred();
// /// convergence loop
// UInt count = 0;
// Real error = 0.;
// do {
// std::cout << "passing step " << s << " " << s * time_step << "s - " << std::setw(4) << count << " : " << std::scientific << error << "\r" << std::flush;
// model->updateResidual();
// model->solveDynamic();
// model->implicitCorr();
// count++;
// } while(!model->testConvergenceIncrement(1e-12, error) && (count < 1000));
model->explicitPred();
model->updateResidual();
model->updateAcceleration();
model->explicitCorr();
akantu::Real epot = model->getPotentialEnergy();
akantu::Real ekin = model->getKineticEnergy();
energy << s << "," << (s-1)*time_step << "," << epot << "," << ekin << "," << epot + ekin
<< std::endl;
#ifdef AKANTU_USE_IOHELPER
if(s % 1 == 0) paraviewDump(dumper);
#endif //AKANTU_USE_IOHELPER
if(s % 100 == 0) std::cout << "passing step " << s << "/" << max_steps << std::endl;
}
energy.close();
delete model;
akantu::finalize();
return EXIT_SUCCESS;
}
/* -------------------------------------------------------------------------- */
/* iohelper::Dumper vars */
/* -------------------------------------------------------------------------- */
#ifdef AKANTU_USE_IOHELPER
void paraviewInit(iohelper::Dumper & dumper) {
dumper.SetMode(iohelper::TEXT);
dumper.SetPoints(model->getFEM().getMesh().getNodes().values,
spatial_dimension, nb_nodes, "bar2d_mass_not_lumped");
dumper.SetConnectivity((int *)model->getFEM().getMesh().getConnectivity(type).values,
paraview_type, nb_element, iohelper::C_MODE);
dumper.AddNodeDataField(model->getDisplacement().values,
spatial_dimension, "displacements");
dumper.AddNodeDataField(model->getVelocity().values,
spatial_dimension, "velocity");
dumper.AddNodeDataField(model->getAcceleration().values,
spatial_dimension, "acceleration");
dumper.AddNodeDataField(model->getResidual().values,
spatial_dimension, "force");
dumper.AddNodeDataField(model->getForce().values,
spatial_dimension, "applied_force");
dumper.AddNodeDataField(lumped->values,
spatial_dimension, "mass");
dumper.SetEmbeddedValue("displacements", 1);
dumper.SetEmbeddedValue("applied_force", 1);
dumper.SetPrefix("paraview/");
dumper.Init();
dumper.Dump();
}
/* -------------------------------------------------------------------------- */
void paraviewDump(iohelper::Dumper & dumper) {
dumper.Dump();
}
#endif
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