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rAKA/examples/io/dumper/dumper_low_level.cc
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dumper_low_level.cc
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/**
* Copyright (©) 2015-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This file is part of Akantu
*
* 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 "element_group.hh"
#include "group_manager.hh"
#include "mesh.hh"
#include "dumper_elemental_field.hh"
#include "dumper_nodal_field.hh"
#include "dumper_iohelper_paraview.hh"
#include "locomotive_tools.hh"
/* -------------------------------------------------------------------------- */
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.
Int spatial_dimension = 2;
Mesh mesh(spatial_dimension);
mesh.read("swiss_train.msh");
Array<Real> & nodes = mesh.getNodes();
Int nb_nodes = mesh.getNbNodes();
/* swiss_train.msh has the following physical groups that can be viewed with
GMSH:
"$MeshFormat
2.2 0 8
$EndMeshFormat
$PhysicalNames
6
2 1 "red"
2 2 "white"
2 3 "lwheel_1"
2 4 "lwheel_2"
2 5 "rwheel_2"
2 6 "rwheel_1"
$EndPhysicalNames
..."
*/
// Grouping nodes and elements belonging to train wheels (=four mesh data)
ElementGroup & wheels_elements =
mesh.createElementGroup("wheels", spatial_dimension);
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"));
const Array<Idx> & lnode_1 =
(mesh.getElementGroup("lwheel_1")).getNodeGroup().getNodes();
const Array<Idx> & lnode_2 =
(mesh.getElementGroup("lwheel_2")).getNodeGroup().getNodes();
const Array<Idx> & rnode_1 =
(mesh.getElementGroup("rwheel_1")).getNodeGroup().getNodes();
const Array<Idx> & rnode_2 =
(mesh.getElementGroup("rwheel_2")).getNodeGroup().getNodes();
/* Note 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(nb_nodes, 3);
// ElementalField are constructed with an ElementTypeMapArray.
ElementTypeMapArray<Int> colour;
colour.initialize(mesh, _with_nb_element = true);
/* ------------------------------------------------------------------------ */
/* Dumper creation */
/* ------------------------------------------------------------------------ */
// 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);
// Register a filtered mesh limited to nodes and elements from wheels groups
wheels.registerFilteredMesh(mesh, wheels_elements.getElements(),
wheels_elements.getNodeGroup().getNodes());
// Generate an output file of the two mesh registered.
dumper.dump();
wheels.dump();
/* At this stage no fields are attached to the two dumpers. To do so, a
dumpers::Field object has to be created. Several types of dumpers::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.
*/
// NodalField are constructed with an Array.
auto displ_field = std::make_shared<dumpers::NodalField<Real>>(displacement);
auto colour_field = std::make_shared<dumpers::ElementalField<Int>>(colour);
// Register the freshly created fields to our dumper.
dumper.registerField("displacement", displ_field);
dumper.registerField("colour", colour_field);
// For the dumper wheels, fields have to be filtered at registration.
// Filtered NodalField can be simply registered by adding an Array<UInt>
// listing the nodes.
auto displ_field_wheel = std::make_shared<dumpers::NodalField<Real, true>>(
displacement, 0, 0, &(wheels_elements.getNodeGroup().getNodes()));
wheels.registerField("displacement", displ_field_wheel);
// For the ElementalField, an ElementTypeMapArrayFilter has to be created.
ElementTypeMapArrayFilter<Int> filtered_colour(colour,
wheels_elements.getElements());
auto colour_field_wheel =
std::make_shared<dumpers::ElementalField<Int, Vector<Int>, true>>(
filtered_colour);
wheels.registerField("colour", colour_field_wheel);
/* ------------------------------------------------------------------------ */
// Now that the dumpers are created and the fields are associated, let's
// paint and move the train!
// Fill the ElementTypeMapArray colour according to mesh data information.
fillColour(mesh, colour);
// Apply displacement and wheels rotation.
Real tot_displacement = 50.;
Real radius = 1.;
Int nb_steps = 100;
Real theta = tot_displacement / radius;
Vector<Real> l_center(3);
Vector<Real> r_center(3);
for (Int i = 0; i < spatial_dimension; ++i) {
l_center(i) = nodes(14, i);
r_center(i) = nodes(2, i);
}
for (Int i = 0; i < nb_steps; ++i) {
displacement.zero();
Real angle = (Real)i / (Real)nb_steps * theta;
applyRotation(l_center, angle, nodes, displacement, lnode_1);
applyRotation(l_center, angle, nodes, displacement, lnode_2);
applyRotation(r_center, angle, nodes, displacement, rnode_1);
applyRotation(r_center, angle, nodes, displacement, rnode_2);
for (Int 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();
}
finalize();
return 0;
}
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