71 #ifndef LIBMESH_HAVE_EXODUS_API 72 libmesh_example_requires(
false,
"--enable-exodus");
76 libmesh_example_requires(LIBMESH_DIM > 2,
"--disable-1D-only --disable-2D-only");
79 #ifndef LIBMESH_ENABLE_DIRICHLET 80 libmesh_example_requires(
false,
"--enable-dirichlet");
86 GetPot infile(
"systems_of_equations_ex8.in");
87 infile.parse_command_line(argc,argv);
89 const std::string approx_order = infile(
"approx_order",
"FIRST");
90 const std::string fe_family = infile(
"fe_family",
"LAGRANGE");
92 const Real young_modulus = infile(
"Young_modulus", 1.0);
93 const Real poisson_ratio = infile(
"poisson_ratio", 0.3);
95 const Real nonlinear_abs_tol = infile(
"nonlinear_abs_tol", 1.e-8);
96 const Real nonlinear_rel_tol = infile(
"nonlinear_rel_tol", 1.e-8);
97 const unsigned int nonlinear_max_its = infile(
"nonlinear_max_its", 50);
98 const Real contact_penalty = infile(
"contact_penalty", 1.e2);
99 const Real gap_function_tol = infile(
"gap_function_tol", 1.e-8);
103 mesh.
read(
"systems_of_equations_ex8.exo");
105 const unsigned int n_refinements = infile(
"n_refinements", 0);
107 #ifndef LIBMESH_ENABLE_AMR 108 libmesh_example_requires(n_refinements==0,
"--enable-amr");
111 mesh_refinement.uniformly_refine(n_refinements);
125 Utility::string_to_enum<Order> (approx_order),
126 Utility::string_to_enum<FEFamily>(fe_family));
130 Utility::string_to_enum<Order> (approx_order),
131 Utility::string_to_enum<FEFamily>(fe_family));
135 Utility::string_to_enum<Order> (approx_order),
136 Utility::string_to_enum<FEFamily>(fe_family));
150 equation_systems.parameters.set<
Real> (
"nonlinear solver absolute residual tolerance") = nonlinear_abs_tol;
151 equation_systems.parameters.set<
Real> (
"nonlinear solver relative residual tolerance") = nonlinear_rel_tol;
152 equation_systems.parameters.set<
unsigned int> (
"nonlinear solver maximum iterations") = nonlinear_max_its;
156 equation_systems.parameters.set<
Real>(
"young_modulus") = young_modulus;
157 equation_systems.parameters.set<
Real>(
"poisson_ratio") = poisson_ratio;
159 #ifdef LIBMESH_ENABLE_DIRICHLET 178 #endif // LIBMESH_ENABLE_DIRICHLET 181 le.initialize_contact_load_paths();
183 libMesh::out <<
"Mesh before adding edge connectors" << std::endl;
185 le.add_contact_edge_elements();
187 libMesh::out <<
"Mesh after adding edge connectors" << std::endl;
190 equation_systems.init();
191 equation_systems.print_info();
193 libMesh::out <<
"Contact penalty: " << contact_penalty << std::endl << std::endl;
195 Real current_max_gap_function = std::numeric_limits<Real>::max();
197 const unsigned int max_outer_iterations = 10;
198 for (
unsigned int outer_iteration = 0;
199 outer_iteration != max_outer_iterations; ++outer_iteration)
201 if (current_max_gap_function <= gap_function_tol)
207 libMesh::out <<
"Starting outer iteration " << outer_iteration << std::endl;
216 std::pair<Real, Real> least_and_max_gap_function = le.get_least_and_max_gap_function();
217 Real least_gap_fn = least_and_max_gap_function.first;
218 Real max_gap_fn = least_and_max_gap_function.second;
220 libMesh::out <<
"Finished outer iteration, least gap function: " 222 <<
", max gap function: " 227 current_max_gap_function = std::max(
std::abs(least_gap_fn),
std::abs(max_gap_fn));
236 le.compute_stresses();
238 std::stringstream filename;
239 filename <<
"solution.exo";
This is the EquationSystems class.
virtual void read(const std::string &name, void *mesh_data=nullptr, bool skip_renumber_nodes_and_elements=false, bool skip_find_neighbors=false)=0
Interfaces for reading/writing a mesh to/from a file.
The ReplicatedMesh class is derived from the MeshBase class, and is used to store identical copies of...
std::unique_ptr< NonlinearSolver< Number > > nonlinear_solver
The NonlinearSolver defines the default interface used to solve the nonlinear_implicit system...
ConstFunction that simply returns 0.
virtual void write_equation_systems(const std::string &, const EquationSystems &, const std::set< std::string > *system_names=nullptr)
This method implements writing a mesh with data to a specified file where the data is taken from the ...
The ExodusII_IO class implements reading meshes in the ExodusII file format from Sandia National Labs...
This class allows one to associate Dirichlet boundary values with a given set of mesh boundary ids an...
The LibMeshInit class, when constructed, initializes the dependent libraries (e.g.
ADRealEigenVector< T, D, asd > abs(const ADRealEigenVector< T, D, asd > &)
SolverPackage default_solver_package()
void libmesh_ignore(const Args &...)
Implements (adaptive) mesh refinement algorithms for a MeshBase.
void print_info(std::ostream &os=libMesh::out, const unsigned int verbosity=0, const bool global=true) const
Prints relevant information about the mesh.
void init(triangulateio &t)
Initializes the fields of t to nullptr/0 as necessary.
Manages consistently variables, degrees of freedom, coefficient vectors, matrices and non-linear solv...
unsigned int add_variable(std::string_view var, const FEType &type, const std::set< subdomain_id_type > *const active_subdomains=nullptr)
Adds the variable var to the list of variables for this system.
virtual void solve() override
Assembles & solves the nonlinear system R(x) = 0.
virtual void update()
Update the local values to reflect the solution on neighboring processors.
DIE A HORRIBLE DEATH HERE typedef LIBMESH_DEFAULT_SCALAR_TYPE Real
Function that returns a single value that never changes.
void add_dirichlet_boundary(const DirichletBoundary &dirichlet_boundary)
Adds a copy of the specified Dirichlet boundary to the system.
const DofMap & get_dof_map() const
Manages consistently variables, degrees of freedom, and coefficient vectors for explicit systems...
void enforce_constraints_exactly(const System &system, NumericVector< Number > *v=nullptr, bool homogeneous=false) const
Constrains the numeric vector v, which represents a solution defined on the mesh. ...