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material_viscoelastic_maxwell_energies.cc
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material_viscoelastic_maxwell_energies.cc
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/**
* @file material_viscoelastic_maxwell_energies.cc
*
* @author Emil Gallyamov <emil.gallyamov@epfl.ch>
*
* @date creation: Tue Nov 20 2018
* @date last modification: Sun Dec 30 2018
*
* @brief Example of using viscoelastic material and computing energies
*
*
* @section LICENSE
*
* Copyright (©) 2018-2021 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 <fstream>
#include <iostream>
#include <limits>
#include <sstream>
/* -------------------------------------------------------------------------- */
#include "material_viscoelastic_maxwell.hh"
#include "non_linear_solver.hh"
#include "solid_mechanics_model.hh"
#include "sparse_matrix.hh"
using namespace akantu;
/* -------------------------------------------------------------------------- */
/* Main */
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
akantu::initialize("material_viscoelastic_maxwell.dat", argc, argv);
// sim data
Real eps = 0.1;
const Int dim = 2;
Real sim_time = 100.;
Real T = 10.;
Mesh mesh(dim);
mesh.read("material_viscoelastic_maxwell_mesh.msh");
SolidMechanicsModel model(mesh);
/* ------------------------------------------------------------------------ */
/* Initialization */
/* ------------------------------------------------------------------------ */
model.initFull(_analysis_method = _static);
std::cout << model.getMaterial(0) << std::endl;
std::stringstream filename_sstr;
filename_sstr << "material_viscoelastic_maxwell_output.out";
std::ofstream output_data;
output_data.open(filename_sstr.str().c_str());
Material & mat = model.getMaterial(0);
Real time_step = 0.1;
const Array<Real> & coordinate = mesh.getNodes();
Array<Real> & displacement = model.getDisplacement();
Array<bool> & blocked = model.getBlockedDOFs();
/// Setting time step
model.setTimeStep(time_step);
model.setBaseName("dynamic");
model.addDumpFieldVector("displacement");
model.addDumpField("blocked_dofs");
model.addDumpField("external_force");
model.addDumpField("internal_force");
model.addDumpField("grad_u");
model.addDumpField("stress");
model.addDumpField("strain");
Int max_steps = sim_time / time_step + 1;
Real time = 0.;
auto & solver = model.getNonLinearSolver();
solver.set("max_iterations", 10);
solver.set("threshold", 1e-7);
solver.set("convergence_type", SolveConvergenceCriteria::_residual);
/* ------------------------------------------------------------------------ */
/* Main loop */
/* ------------------------------------------------------------------------ */
for (Int s = 0; s <= max_steps; ++s) {
std::cout << "Time Step = " << time_step << "s" << std::endl;
std::cout << "Time = " << time << std::endl;
// impose displacement
Real epsilon = 0;
if (time < T) {
epsilon = eps * time / T;
} else {
epsilon = eps;
}
for (auto && [coord, disp, block] :
zip(make_view(coordinate, dim), make_view(displacement, dim),
make_view(blocked, dim))) {
if (Math::are_float_equal(coord(_x), 0.0)) {
disp(_x) = 0;
disp(_y) = epsilon * coord(_y);
block.set(true);
} else if (Math::are_float_equal(coord(_y), 0.0)) {
disp(_x) = epsilon * coord(_x);
disp(_y) = 0;
block.set(true);
} else if (Math::are_float_equal(coord(_x), 0.001)) {
disp = epsilon * coord;
block.set(true);
} else if (Math::are_float_equal(coord(_y), 0.001)) {
disp = epsilon * coord;
block.set(true);
}
}
try {
model.solveStep();
} catch (debug::NLSNotConvergedException & e) {
std::cout << "Didn't converge after " << e.niter
<< " iterations. Error is " << e.error << std::endl;
return EXIT_FAILURE;
}
// for debugging
// auto int_force = model.getInternalForce();
// auto &K = model.getDOFManager().getMatrix("K");
// K.saveMatrix("K.mtx");
Int nb_iter = solver.get("nb_iterations");
std::cout << "Converged in " << nb_iter << " iterations" << std::endl;
model.dump();
Real epot = mat.getEnergy("potential");
Real edis = mat.getEnergy("dissipated");
Real work = mat.getEnergy("work");
// data output
output_data << s * time_step << " " << epsilon << " " << epot << " " << edis
<< " " << work << std::endl;
time += time_step;
}
output_data.close();
finalize();
}

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