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demonstrator_dynamic_solve.cc
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demonstrator_dynamic_solve.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 "external/cxxopts.hpp"
#include "common/muSpectre_common.hh"
#include "cell/cell_factory.hh"
#include "materials/material_linear_elastic1.hh"
#include "solver/solvers.hh"
#include "solver/solver_cg.hh"
#include <libmugrid/ccoord_operations.hh>
using opt_ptr = std::unique_ptr<cxxopts::Options>;
opt_ptr parse_args(int argc, char ** argv) {
opt_ptr options =
std::make_unique<cxxopts::Options>(argv[0], "Tests MPI fft scalability");
try {
options->add_options()("0,N0", "number of rows", cxxopts::value<int>(),
"N0")("h,help", "print help")(
"positional",
"Positional arguments: these are the arguments that are entered "
"without an option",
cxxopts::value<std::vector<std::string>>());
options->parse_positional(std::vector<std::string>{"N0", "positional"});
options->parse(argc, argv);
if (options->count("help")) {
std::cout << options->help({"", "Group"}) << std::endl;
exit(0);
}
if (options->count("N0") != 1) {
throw cxxopts::OptionException("Parameter N0 missing");
} else if ((*options)["N0"].as<int>() % 2 != 1) {
throw cxxopts::OptionException("N0 must be odd");
} else if (options->count("positional") > 0) {
throw cxxopts::OptionException("There are too many positional arguments");
}
} catch (const cxxopts::OptionException & e) {
std::cout << "Error parsing options: " << e.what() << std::endl;
exit(1);
}
return options;
}
using namespace muSpectre;
using namespace muGrid;
using namespace muFFT;
int main(int argc, char * argv[]) {
banner("demonstrator1", 2018, "Till Junge <till.junge@epfl.ch>");
auto options{parse_args(argc, argv)};
auto & opt{*options};
const Dim_t size{opt["N0"].as<int>()};
constexpr Real fsize{1.};
constexpr Dim_t dim{3};
const Dim_t nb_dofs{ipow(size, dim) * ipow(dim, 2)};
std::cout << "Number of dofs: " << nb_dofs << std::endl;
constexpr Formulation form{Formulation::finite_strain};
const Rcoord_t<dim> lengths{CcoordOps::get_cube<dim>(fsize)};
const Ccoord_t<dim> resolutions{CcoordOps::get_cube<dim>(size)};
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 & Material_soft{Material_t::make(cell, "soft", E, nu)};
auto & Material_hard{Material_t::make(cell, "hard", 10 * E, nu)};
int counter{0};
for (const auto && pixel : cell) {
int sum = 0;
for (Dim_t i = 0; i < dim; ++i) {
sum += pixel[i] * 2 / resolutions[i];
}
if (sum == 0) {
Material_hard.add_pixel(pixel);
counter++;
} else {
Material_soft.add_pixel(pixel);
}
}
std::cout << counter << " Pixel out of " << cell.size()
<< " are in the hard material" << std::endl;
cell.initialise(FFT_PlanFlags::measure);
constexpr Real newton_tol{1e-4};
constexpr Real cg_tol{1e-7};
const Uint maxiter = nb_dofs;
Eigen::MatrixXd DeltaF{Eigen::MatrixXd::Zero(dim, dim)};
DeltaF(0, 1) = .1;
Dim_t verbose{1};
auto start = std::chrono::high_resolution_clock::now();
LoadSteps_t loads{DeltaF};
SolverCG cg{cell, cg_tol, maxiter, static_cast<bool>(verbose)};
newton_cg(cell, loads, 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;
return 0;
}

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