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example_dumper_low_level.cc
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example_dumper_low_level.cc
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/**
* @file example_dumper_low_level.cc
* @author Fabian Barras <fabian.barras@epfl.ch>
* @date Thu Jul 2 14:34:41 2015
*
* @brief Example of dumper::DumperIOHelper low-level methods.
*
* @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 <limits>
#include <fstream>
#include <iostream>
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "mesh.hh"
#include "element_group.hh"
#include "mesh_io.hh"
#include "mesh_io_msh.hh"
#include "mesh_utils.hh"
#include "dumper_paraview.hh"
#include "dumper_elemental_field.hh"
#include "dumper_nodal_field.hh"
#include "locomotive.hh"
#define PI 3.141592653589
/* -------------------------------------------------------------------------- */
using namespace akantu;
int main(int argc, char *argv[]) {
/* This example aims at illustrating how to manipulate low-level methods of DumperIOHelper.
The aims is to visualize a colorized moving train with Paraview */
initialize(argc, argv);
/// To start let us load the swiss train mesh and its mesh data information.
/// We aknowledge here a weel-known swiss industry for mesh donation.
UInt spatial_dimension = 2;
Mesh mesh(spatial_dimension);
mesh.read("swiss_train.msh");
mesh.createGroupsFromMeshData<std::string>("physical_names");
/* swiss_train.msh has the following physical groups that can be viewed with GMSH:
"$MeshFormat
2.2 0 8
$EndMeshFormat
$PhysicalNames
6
2 1 "rouge"
2 2 "blanc"
2 3 "lwheel_1"
2 4 "lwheel_2"
2 5 "rwheel_2"
2 6 "rwheel_1"
$EndPhysicalNames
..."
*/
/// Creation of two DumperParaview. One for full mesh, one for a filtered mesh.
DumperParaview dumper("train", "./paraview/dumper", false);
DumperParaview wheels("wheels", "./paraview/dumper", false);
/// Register the full mesh
dumper.registerMesh(mesh);
/// Grouping nodes and elements belonging to train wheels (=four mesh data)
NodeGroup & wheels_nodes = mesh.createNodeGroup("wheels_nodes");
wheels_nodes.append(mesh.getElementGroup("lwheel_1").getNodeGroup());
wheels_nodes.append(mesh.getElementGroup("lwheel_2").getNodeGroup());
wheels_nodes.append(mesh.getElementGroup("rwheel_1").getNodeGroup());
wheels_nodes.append(mesh.getElementGroup("rwheel_2").getNodeGroup());
ElementGroup & wheels_elements = mesh.createElementGroup("wheels_elements", spatial_dimension, wheels_nodes);
wheels_elements.append(mesh.getElementGroup("lwheel_1"));
wheels_elements.append(mesh.getElementGroup("lwheel_2"));
wheels_elements.append(mesh.getElementGroup("rwheel_1"));
wheels_elements.append(mesh.getElementGroup("rwheel_2"));
/// Register a filtered mesh limited to nodes and elements from wheels groups
wheels.registerFilteredMesh(mesh,
wheels_elements.getElements(),
wheels_elements.getNodes());
/// Generate an output file of the two mesh registered.
dumper.dump();
wheels.dump();
/// At this stage no fields are attached to the two meshes.
/// To do so, a dumper::Field object has to be created.
/// Several types of dumper::Field exist. In this example we present two of them.
/// NodalField to describe nodal displacements of our train.
/// ElementalField handling the color of our different part.
Array<Real> & node = mesh.getNodes();
UInt nb_nodes = mesh.getNbNodes();
/// NodalField are constructed with an Array.
/* Note that this Array is constructed with three components
in order to warp train deformation on Paraview.
A more appropriate way to do this is to set a padding in the NodalField
(See example_dumpable_interface.cc.) */
Array<Real> * displacement = new Array<Real>(nb_nodes,3);
dumper::Field * displ = new dumper::NodalField<Real>(*displacement);
/// ElementalField are constructed with an ElementTypeMapArray.
ElementTypeMapArray<UInt> colour;
mesh.initElementTypeMapArray(colour, 1, spatial_dimension, false, _ek_regular, true);
dumper::Field * color = new dumper::ElementalField<UInt>(colour);
/// Register the freshly created fields to our dumper.
dumper.registerField("displacement", displ);
dumper.registerField("colour", color);
/// For the dumper wheels, fields have to be filtered at registration.
/// Filter NodalField can be simply registered by adding an Array<UInt> listing filtered nodes.
wheels.registerField("displacement",
new dumper::NodalField<Real,true>(*displacement,0,0,&(wheels_elements.getNodes())));
/// For ElementalField, an ElementTypeMapArrayFilter has to be created.
const ElementTypeMapArray<UInt> & elemental_filter = wheels_elements.getElements();
ElementTypeMapArrayFilter<UInt> * filter = new ElementTypeMapArrayFilter<UInt>(colour,elemental_filter);
wheels.registerField("colour",
new dumper::ElementalField<UInt,Vector,true>(*filter));
///Now that our dumpers are created and the two fields are associated, let's paint and move the train!
/// Fill the ElementTypeMapArray colour according to mesh data information.
ElementTypeMapArray<std::string> * phys_data = &(mesh.getData<std::string>("physical_names"));
Array<std::string> & txt_colour = (*phys_data)(_triangle_3);
Array<UInt> & id_colour = (colour)(_triangle_3);
for (UInt i = 0; i < txt_colour.getSize(); ++i) {
std::string phy_name = txt_colour[i];
if (phy_name == "rouge")
id_colour[i] = 3;
else if (phy_name == "blanc"||phy_name == "lwheel_1"||phy_name == "rwheel_1")
id_colour[i] = 2;
else
id_colour[i] = 1;
}
/// Apply displacement and wheels rotation.
Real tot_displacement = 50.;
Real radius = 1.;
UInt nb_steps = 500;
Real theta = tot_displacement/radius;
Array<Real> l_center(spatial_dimension);
Array<Real> r_center(spatial_dimension);
const Array<UInt> & lnode_1 = (mesh.getElementGroup("lwheel_1")).getNodes();
const Array<UInt> & lnode_2 = (mesh.getElementGroup("lwheel_2")).getNodes();
const Array<UInt> & rnode_1 = (mesh.getElementGroup("rwheel_1")).getNodes();
const Array<UInt> & rnode_2 = (mesh.getElementGroup("rwheel_2")).getNodes();
for (UInt i = 0; i < spatial_dimension; ++i) {
l_center(i) = node(14,i);
r_center(i) = node(2,i);
}
for (UInt i = 0; i < nb_steps; ++i) {
displacement->clear();
Real angle = (Real)i / (Real)nb_steps * theta;
applyRotation(l_center, angle, node, displacement, lnode_1);
applyRotation(l_center, angle, node, displacement, lnode_2);
applyRotation(r_center, angle, node, displacement, rnode_1);
applyRotation(r_center, angle, node, displacement, rnode_2);
for (UInt j = 0; j < nb_nodes; ++j) {
(*displacement)(j,0) += (Real)i / (Real)nb_steps *tot_displacement;
}
/// Output results after each moving steps for main and wheel dumpers.
dumper.dump();
wheels.dump();
}
return 0;
}

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