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contact_explicit_dynamic.cc
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Wed, Jul 10, 13:23

contact_explicit_dynamic.cc
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/**
* @file test_contact_mechanics_model.cc
*
* @author Mohit Pundir <mohit.pundir@epfl.ch>
*
* @date creation: Tue Apr 30 2019
* @date last modification: Tue Apr 30 2019
*
* @brief Test for contact mechanics model class
*
* @section LICENSE
*
* Copyright (©) 2010-2018 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 "solid_mechanics_model.hh"
#include "contact_mechanics_model.hh"
#include "coupler_solid_contact.hh"
#include "non_linear_solver.hh"
#include "surface_selector.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
/* -------------------------------------------------------------------------- */
int main(int argc, char *argv[]) {
const UInt spatial_dimension = 2;
initialize("material.dat", argc, argv);
Real time_step;
Real time_factor = 0.8;
UInt max_steps = 5000;
Mesh mesh(spatial_dimension);
mesh.read("hertz.msh");
CouplerSolidContact coupler(mesh);
auto & solid = coupler.getSolidMechanicsModel();
auto & contact = coupler.getContactMechanicsModel();
auto && selector = std::make_shared<MeshDataMaterialSelector<std::string>>(
"physical_names",solid);
solid.setMaterialSelector(selector);
solid.initFull( _analysis_method = _explicit_lumped_mass);
contact.initFull(_analysis_method = _explicit_dynamic_contact);
auto && surface_selector = std::make_shared<PhysicalSurfaceSelector>(mesh);
contact.getContactDetector().setSurfaceSelector(surface_selector);
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "bottom");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _y), "bottom");
solid.applyBC(BC::Dirichlet::FixedValue(0.0, _x), "top");
coupler.initFull(_analysis_method = _explicit_dynamic_contact);
time_step = solid.getStableTimeStep();
std::cout << "Time Step = " << time_step * time_factor << "s (" << time_step
<< "s)" << std::endl;
coupler.setTimeStep(time_step * time_factor);
coupler.setBaseName("contact-explicit-dynamic");
coupler.addDumpFieldVector("displacement");
coupler.addDumpFieldVector("velocity");
coupler.addDumpFieldVector("normals");
coupler.addDumpFieldVector("contact_force");
coupler.addDumpFieldVector("external_force");
coupler.addDumpFieldVector("internal_force");
coupler.addDumpField("gaps");
coupler.addDumpField("areas");
coupler.addDumpField("blocked_dofs");
coupler.addDumpField("grad_u");
coupler.addDumpField("stress");
auto & velocity = solid.getVelocity();
Real damping_ratio = 0.7;
for (auto i : arange(max_steps)) {
Real factor = 5e-4;
auto increment = time_step * factor;
solid.applyBC(BC::Dirichlet::IncrementValue(-increment, _y), "top");
coupler.solveStep();
Real epot = solid.getEnergy("potential");
Real ekin = solid.getEnergy("kinetic");
std::cerr << i << "," << i * increment << "," << epot << "," << ekin << ","
<< epot + ekin << "," << std::endl;
for (auto & v : make_view(velocity)) {
v *= damping_ratio;
}
coupler.dump();
}
finalize();
return EXIT_SUCCESS;
}

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