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test_material_viscoelastic.cc
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Sat, May 11, 14:16

test_material_viscoelastic.cc
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/**
* @file test_material_viscoelastic.cc
* @author Vlad Yastrebov <vladislav.yastrebov@epfl.ch>
* @author David Kammer <david.kammer@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
* @date Feb 9 2012
*
* @brief test of the material viscoelastic
*
* @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_tools.hh"
#endif //AKANTU_USE_IOHELPER
using namespace akantu;
int main(int argc, char *argv[])
{
akantu::initialize(argc, argv);
akantu::debug::setDebugLevel(akantu::dblWarning);
const ElementType element_type = TYPE;
UInt dim = Mesh::getSpatialDimension(element_type);
/// load mesh
Mesh mesh(dim);
MeshIOMSH mesh_io;
std::stringstream meshname_sstr;
meshname_sstr << "test_material_viscoelastic_" << element_type << ".msh";
mesh_io.read(meshname_sstr.str().c_str(), mesh);
UInt max_steps = 5000;
Real time_factor = 0.8;
UInt nb_nodes = mesh.getNbNodes();
SolidMechanicsModel model(mesh);
/* ------------------------------------------------------------------------ */
/* Initialization */
/* ------------------------------------------------------------------------ */
model.initVectors();
model.getForce().clear();
model.getVelocity().clear();
model.getAcceleration().clear();
model.getDisplacement().clear();
model.updateResidual();
model.initExplicit();
model.initModel();
model.readMaterials("material_viscoelastic.dat");
model.initMaterials();
std::cout << model.getMaterial(0) << std::endl;
model.assembleMassLumped();
/* ------------------------------------------------------------------------ */
/* Boundary + initial conditions */
/* ------------------------------------------------------------------------ */
Real eps = 1e-16;
for (UInt i = 0; i < nb_nodes; ++i) {
if(mesh.getNodes().values[dim*i] >= 9)
model.getDisplacement().values[dim*i+1]
= (mesh.getNodes().values[dim*i] - 9) / 100.;
if(mesh.getNodes().values[dim*i] <= eps)
model.getBoundary().values[dim*i] = true;
/*
if(mesh.getNodes().values[dim*i + 1] <= eps ||
mesh.getNodes().values[dim*i + 1] >= 1 - eps ) {
model.getBoundary().values[dim*i + 1] = true;
}
*/
}
/// dump facet and surface information to paraview
#ifdef AKANTU_USE_IOHELPER
iohelper::DumperParaview dumper;
// paraviewInit(dumper, model, element_type, "test_viscoelastic2");
MaterialViscoElastic & mat = dynamic_cast<MaterialViscoElastic &>((model.getMaterial(0)));
dumper.SetMode(iohelper::BASE64);
dumper.SetPoints(model.getFEM().getMesh().getNodes().values, 2, nb_nodes, "coordinates_damage_nl");
dumper.SetConnectivity((int *)model.getFEM().getMesh().getConnectivity(_triangle_3).values,
iohelper::TRIANGLE1, model.getFEM().getMesh().getNbElement(_triangle_3), iohelper::C_MODE);
dumper.AddNodeDataField(model.getDisplacement().values, 2, "displacements");
dumper.AddNodeDataField(model.getVelocity().values, 2, "velocity");
dumper.AddNodeDataField(model.getForce().values, 2, "force");
dumper.AddNodeDataField(model.getMass().values, 1, "Mass");
dumper.AddNodeDataField(model.getResidual().values, 2, "residual");
dumper.AddElemDataField(mat.getStrain(_triangle_3).values, 4, "strain");
dumper.AddElemDataField(mat.getStress(_triangle_3).values, 4, "stress");
// Real * dam = mat.getHistoryIntegral(_triangle_3).values;
// dumper.AddElemDataField(dam, 4, "damage");
dumper.AddElemDataField(mat.getHistoryIntegral(_triangle_3).values, 4, "history");
dumper.SetEmbeddedValue("displacements", 1);
dumper.SetEmbeddedValue("force", 1);
dumper.SetEmbeddedValue("residual", 1);
dumper.SetEmbeddedValue("velocity", 1);
dumper.SetPrefix("paraview/");
dumper.Init();
dumper.Dump();
#endif //AKANTU_USE_IOHELPER
std::stringstream filename_sstr;
filename_sstr << "test_material_viscoelastic_" << element_type << ".out";
std::ofstream energy;
energy.open(filename_sstr.str().c_str());
energy << "id epot ekin tot" << std::endl;
/// Setting time step
Real time_step = model.getStableTimeStep() * time_factor;
std::cout << "Time Step = " << time_step << "s" << std::endl;
model.setTimeStep(time_step);
/* ------------------------------------------------------------------------ */
/* Main loop */
/* ------------------------------------------------------------------------ */
for(UInt s = 1; s <= max_steps; ++s) {
model.explicitPred();
model.updateResidual();
model.updateAcceleration();
model.explicitCorr();
Real epot = model.getPotentialEnergy();
Real ekin = model.getKineticEnergy();
if(s % 10 == 0) {
std::cerr << "passing step " << s << "/" << max_steps << std::endl;
energy << s << " " << epot << " " << ekin << " " << epot + ekin
<< std::endl;
}
#ifdef AKANTU_USE_IOHELPER
if(s % 10 == 0) paraviewDump(dumper);
#endif //AKANTU_USE_IOHELPER
}
finalize();
return EXIT_SUCCESS;
}

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