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demonstrator2.cc
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/**
* @file demonstrator1.cc
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 03 Jan 2018
*
* @brief larger problem to show off
*
* Copyright © 2018 Till Junge
*
* µSpectre 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, or (at
* your option) any later version.
*
* µSpectre 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
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with µSpectre; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* * Boston, MA 02111-1307, USA.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this Program, or any covered work, by linking or combining it
* with proprietary FFT implementations or numerical libraries, containing parts
* covered by the terms of those libraries' licenses, the licensors of this
* Program grant you additional permission to convey the resulting work.
*/
#include <iostream>
#include <memory>
#include <chrono>
#include "common/common.hh"
#include "common/ccoord_operations.hh"
#include "cell/cell_factory.hh"
#include "materials/material_linear_elastic1.hh"
#include "solver/solvers.hh"
#include "solver/solver_cg.hh"
using namespace muSpectre;
int main() {
banner("demonstrator1", 2018, "Till Junge <till.junge@epfl.ch>");
constexpr Dim_t dim{2};
constexpr Formulation form{Formulation::finite_strain};
const Rcoord_t<dim> lengths{5.2, 8.3};
const Ccoord_t<dim> resolutions{5, 7};
auto cell{make_cell<dim, dim>(resolutions, lengths, form)};
constexpr Real E{1.0030648180242636};
constexpr Real nu{0.29930675909878679};
using Material_t = MaterialLinearElastic1<dim, dim>;
auto & soft{Material_t::make(cell, "soft", E, nu)};
auto & hard{Material_t::make(cell, "hard", 10 * E, nu)};
int counter{0};
for (const auto && pixel : cell) {
if (counter < 3) {
hard.add_pixel(pixel);
counter++;
} else {
soft.add_pixel(pixel);
}
}
std::cout << counter << " Pixel out of " << cell.size()
<< " are in the hard material" << std::endl;
cell.initialise();
constexpr Real newton_tol{1e-4};
constexpr Real cg_tol{1e-7};
const size_t maxiter = 100;
Eigen::MatrixXd DeltaF{Eigen::MatrixXd::Zero(dim, dim)};
DeltaF(0, 1) = .1;
Dim_t verbose{1};
auto start = std::chrono::high_resolution_clock::now();
SolverCG cg{cell, cg_tol, maxiter, static_cast<bool>(verbose)};
auto res = de_geus(cell, DeltaF, cg, newton_tol, verbose);
std::chrono::duration<Real> dur =
std::chrono::high_resolution_clock::now() - start;
std::cout << "Resolution time = " << dur.count() << "s" << std::endl;
std::cout << res.grad.transpose() << std::endl;
return 0;
}

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