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rAKA/examples/c++/diffusion_model/heat_diffusion_dynamics_3d.cc
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heat_diffusion_dynamics_3d.cc
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/**
* Copyright (©) 2011-2023 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 <fstream>
#include <iostream>
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "heat_transfer_model.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "mesh_io_msh.hh"
/* -------------------------------------------------------------------------- */
using namespace akantu;
Int spatial_dimension = 3;
ElementType type = _tetrahedron_4;
/* -------------------------------------------------------------------------- */
int main(int argc, char * argv[]) {
initialize("material.dat", argc, argv);
Mesh mesh(spatial_dimension);
mesh.read("cube.msh");
HeatTransferModel model(mesh);
// initialize everything
model.initFull(_analysis_method = _explicit_lumped_mass);
// get and set stable time step
Real time_step = model.getStableTimeStep() * 0.8;
std::cout << "Stable Time Step is : " << time_step / .8 << std::endl;
std::cout << "time step is:" << time_step << std::endl;
model.setTimeStep(time_step);
/// boundary conditions
const Array<Real> & nodes = mesh.getNodes();
Array<bool> & boundary = model.getBlockedDOFs();
Array<Real> & temperature = model.getTemperature();
auto nb_nodes = mesh.getNbNodes();
double length;
length = 1.;
for (Int i = 0; i < nb_nodes; ++i) {
temperature(i) = 100.;
// to insert a heat source
Real dx = nodes(i, 0) - length / 2.;
Real dy = nodes(i, 1) - length / 2.;
Real dz = nodes(i, 2) - length / 2.;
Real d = sqrt(dx * dx + dy * dy + dz * dz);
if (d < 0.1) {
boundary(i) = true;
temperature(i) = 300.;
}
}
model.setBaseName("heat_diffusion_cube3d");
model.addDumpField("temperature");
model.addDumpField("temperature_rate");
model.addDumpField("internal_heat_rate");
// //for testing
int max_steps = 1000;
for (int i = 0; i < max_steps; i++) {
model.solveStep();
if (i % 100 == 0)
model.dump();
if (i % 10 == 0) {
std::cout << "Step " << i << "/" << max_steps << std::endl;
}
}
return 0;
}
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