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test_explicit_dynamic.cc
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Mon, Jun 24, 05:59

test_explicit_dynamic.cc
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/* -------------------------------------------------------------------------- */
#include "contact_mechanics_model.hh"
#include "coupler_solid_contact.hh"
#include "non_linear_solver.hh"
#include "solid_mechanics_model.hh"
#include "surface_selector.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
int main(int argc, char * argv[]) {
UInt max_steps = 20000;
Real max_weight = 0.02;
UInt damping_interval = 10;
Real damping_ratio = 0.9;
std::string mesh_file = "flat_on_flat.msh";
std::string material_file = "material.dat";
const UInt spatial_dimension = 2;
initialize(material_file, argc, argv);
Mesh mesh(spatial_dimension);
mesh.read(mesh_file);
CouplerSolidContact coupler(mesh);
auto & solid = coupler.getSolidMechanicsModel();
auto & contact = coupler.getContactMechanicsModel();
auto && material_selector =
std::make_shared<MeshDataMaterialSelector<std::string>>("physical_names",
solid);
solid.setMaterialSelector(material_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");
Vector<Real> weight = {0, -max_weight};
solid.applyBC(BC::Neumann::FromSameDim(weight), "top");
coupler.initFull(_analysis_method = _explicit_dynamic_contact);
Real time_step = solid.getStableTimeStep();
time_step *= 0.1;
coupler.setTimeStep(time_step);
coupler.setBaseName("flat-on-flat");
coupler.addDumpFieldVector("displacement");
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("strain");
coupler.addDumpField("stress");
auto & velocity = solid.getVelocity();
for (UInt s : arange(max_steps)) {
coupler.solveStep();
if (s % damping_interval == 0) {
for (auto & v : make_view(velocity))
v *= damping_ratio;
}
if (s % 100 == 0) {
coupler.dump();
}
}
const ElementType element_type = _quad_4;
const Array<Real> & stress_vect = model.getMaterial("top_body").getStress(element_type);
auto stress_it = stress_vect.begin(spatial_dimension, spatial_dimension);
auto stress_end = stress_vect.end(spatial_dimension, spatial_dimension);
Real stress_tolerance = 1e-13;
Matrix<Real> presc_stress;
for (; stress_it != stress_end; ++stress_it) {
const auto & stress = *stress_it;
Matrix<Real> diff(spatial_dimension, spatial_dimension);
diff = stress;
diff -= presc_stress;
Real stress_error = diff.norm<L_inf>() / stress.norm<L_inf>();
if (stress_error > stress_tolerance) {
std::cerr << "stress error: " << stress_error << " > " << stress_tolerance
<< std::endl;
std::cerr << "stress: " << stress << std::endl
<< "prescribed stress: " << presc_stress << std::endl;
return EXIT_FAILURE;
}
}
finalize();
return EXIT_SUCCESS;
}

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