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rAKA/test/test_model/test_solid_mechanics_model/test_contact/test_contact_rigid/test_contact_rigid_no_friction_hertz_3d_full.cc
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test_contact_rigid_no_friction_hertz_3d_full.cc
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/**
* @file test_contact_rigid_no_friction_hertz_3d_full.cc
* @author David Kammer <david.kammer@epfl.ch>
* @date Mon Jan 24 15:53:42 2011
*
* @brief test rigid contact without friction for full 3d hertz in explicit
*
* @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 "aka_common.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "mesh_io_msh.hh"
#include "mesh_utils.hh"
#include "solid_mechanics_model.hh"
#include "material.hh"
#include "contact.hh"
#include "contact_neighbor_structure.hh"
#include "regular_grid_neighbor_structure.hh"
#include "contact_search.hh"
#include "contact_search_explicit.hh"
#ifdef AKANTU_USE_IOHELPER
# include "io_helper.h"
#endif //AKANTU_USE_IOHELPER
using namespace akantu;
int main(int argc, char *argv[])
{
int dim = 3;
const ElementType element_type = _tetrahedron_4;
const UInt paraview_type = TETRA1;
UInt max_steps = 200000;
UInt imposing_steps = 100000;
Real max_displacement = -0.1;
/// load mesh
Mesh my_mesh(dim);
MeshIOMSH mesh_io;
mesh_io.read("hertz_3d_full.msh", my_mesh);
/// build facet connectivity and surface id
MeshUtils::buildFacets(my_mesh,1,0);
MeshUtils::buildSurfaceID(my_mesh);
UInt nb_nodes = my_mesh.getNbNodes();
/// declaration of model
SolidMechanicsModel my_model(my_mesh);
/// model initialization
my_model.initVectors();
// initialize the vectors
memset(my_model.getForce().values, 0, dim*nb_nodes*sizeof(Real));
memset(my_model.getVelocity().values, 0, dim*nb_nodes*sizeof(Real));
memset(my_model.getAcceleration().values, 0, dim*nb_nodes*sizeof(Real));
memset(my_model.getDisplacement().values, 0, dim*nb_nodes*sizeof(Real));
memset(my_model.getBoundary().values, false, dim*nb_nodes*sizeof(bool));
my_model.initModel();
my_model.readMaterials("material.dat");
my_model.initMaterials();
UInt nb_element = my_model.getFEM().getMesh().getNbElement(element_type);
Real time_step = my_model.getStableTimeStep();
my_model.setTimeStep(time_step/10.);
my_model.assembleMassLumped();
/// contact declaration
Contact * my_contact = Contact::newContact(my_model,
_ct_rigid,
_cst_expli,
_cnst_regular_grid);
my_contact->initContact(false);
Surface master = 1;
my_contact->addMasterSurface(master);
/*const RegularGridNeighborStructure<3> & my_rgns = dynamic_cast<const RegularGridNeighborStructure<3> &>(my_contact->getContactSearch().getContactNeighborStructure(master));
const_cast<RegularGridNeighborStructure<3>&>(my_rgns).setGridSpacing(0.075, 0);
const_cast<RegularGridNeighborStructure<3>&>(my_rgns).setGridSpacing(0.075, 1);
const_cast<RegularGridNeighborStructure<3>&>(my_rgns).setGridSpacing(0.075, 2);*/
my_model.updateCurrentPosition(); // neighbor structure uses current position for init
my_contact->initNeighborStructure(master);
my_contact->initSearch(); // does nothing so far
// boundary conditions
Surface impactor = 0;
Vector<UInt> * top_nodes = new Vector<UInt>(0, 1);
Real * coordinates = my_mesh.getNodes().values;
Real * displacement = my_model.getDisplacement().values;
bool * boundary = my_model.getBoundary().values;
UInt * surface_to_nodes_offset = my_contact->getSurfaceToNodesOffset().values;
UInt * surface_to_nodes = my_contact->getSurfaceToNodes().values;
// symetry boundary conditions
for(UInt n = surface_to_nodes_offset[impactor]; n < surface_to_nodes_offset[impactor+1]; ++n) {
UInt node = surface_to_nodes[n];
Real x_coord = coordinates[node*dim];
Real y_coord = coordinates[node*dim + 1];
Real z_coord = coordinates[node*dim + 2];
/*if (x_coord < 0.00001)
boundary[node*dim] = true;
if (z_coord < 0.00001)
boundary[node*dim+2] = true;*/
if (y_coord > -0.00001) {
boundary[node*dim + 1] = true;
top_nodes->push_back(node);
}
}
// ground boundary conditions
for(UInt n = surface_to_nodes_offset[master]; n < surface_to_nodes_offset[master+1]; ++n) {
UInt node = surface_to_nodes[n];
Real y_coord = coordinates[node*dim + 1];
if (y_coord < -1.2)
boundary[node*dim] = true;
boundary[node*dim + 1] = true;
boundary[node*dim + 2] = true;
}
UInt * top_nodes_val = top_nodes->values;
#ifdef AKANTU_USE_IOHELPER
/// initialize the paraview output
DumperParaview dumper;
dumper.SetMode(TEXT);
dumper.SetPoints(my_model.getFEM().getMesh().getNodes().values, dim, nb_nodes, "coordinates_3d_full");
dumper.SetConnectivity((int *)my_model.getFEM().getMesh().getConnectivity(element_type).values,
paraview_type, nb_element, C_MODE);
dumper.AddNodeDataField(my_model.getDisplacement().values,
dim, "displacements");
dumper.AddNodeDataField(my_model.getVelocity().values, dim, "velocity");
dumper.AddNodeDataField(my_model.getResidual().values, dim, "force");
dumper.AddNodeDataField(my_model.getForce().values, dim, "applied_force");
dumper.AddElemDataField(my_model.getMaterial(0).getStrain(element_type).values, dim*dim, "strain");
dumper.AddElemDataField(my_model.getMaterial(0).getStress(element_type).values, dim*dim, "stress");
dumper.SetEmbeddedValue("displacements", 1);
dumper.SetEmbeddedValue("applied_force", 1);
dumper.SetPrefix("paraview/hertz_3d_full/");
dumper.Init();
dumper.Dump();
#endif //AKANTU_USE_IOHELPER
std::ofstream hertz;
hertz.open("hertz_3d_full.csv");
hertz << "%id,ftop,fcont,zone" << std::endl;
/* ------------------------------------------------------------------------ */
/* Main loop */
/* ------------------------------------------------------------------------ */
for(UInt s = 1; s <= max_steps; ++s) {
if(s % 10 == 0) std::cout << "passing step " << s << "/" << max_steps << std::endl;
if(s % 200 == 0){
my_model.updateCurrentPosition();
my_contact->updateContact();
}
if(s <= imposing_steps) {
Real current_displacement = max_displacement/(static_cast<Real>(imposing_steps))*s;
for(UInt n=0; n<top_nodes->getSize(); ++n) {
UInt node = top_nodes_val[n];
displacement[node*dim + 1] = current_displacement;
}
}
my_model.explicitPred();
my_model.initializeUpdateResidualData();
/// compute the penetration list
PenetrationList * my_penetration_list = new PenetrationList();
const_cast<ContactSearch &>(my_contact->getContactSearch()).findPenetration(master, *my_penetration_list);
UInt nb_nodes_pen = my_penetration_list->penetrating_nodes.getSize();
Vector<UInt> pen_nodes = my_penetration_list->penetrating_nodes;
UInt * pen_nodes_val = pen_nodes.values;
my_contact->solveContact();
my_model.updateResidual(false);
Real * residual = my_model.getResidual().values;
Real top_force = 0.;
for(UInt n=0; n<top_nodes->getSize(); ++n) {
UInt node = top_nodes_val[n];
top_force += residual[node*dim + 1];
}
my_model.updateCurrentPosition();
Real * current_position = my_model.getCurrentPosition().values;
Real contact_force = 0.;
Real contact_zone = 0.;
for (UInt i = 0; i < nb_nodes_pen; ++i) {
UInt node = pen_nodes_val[i];
contact_force += residual[node*dim + 1];
contact_zone = std::max(contact_zone, current_position[node*dim]);
}
delete my_penetration_list;
hertz << s << "," << top_force << "," << contact_force << "," << contact_zone << std::endl;
my_model.updateAcceleration();
my_model.explicitCorr();
#ifdef AKANTU_USE_IOHELPER
if(s % 500 == 0) dumper.Dump();
#endif //AKANTU_USE_IOHELPER
}
hertz.close();
delete my_contact;
delete top_nodes;
finalize();
return EXIT_SUCCESS;
}
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