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mulib_solver.cc
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Tue, Nov 19, 15:46

mulib_solver.cc
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/**
* @file muLib_solver.cc
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 21 Sep 2018
*
* @brief implementation of the mulib solver
*
* Copyright © 2018 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU 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 General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "materials/material_linear_elastic_generic.hh"
#include "solver/mulib_solver.hh"
#include "cell/cell_factory.hh"
#include "solver/solver_cg.hh"
#include "solver/solvers.hh"
namespace muSpectre {
template <Dim_t Dim>
void mulib_worker(MuLibInput & file,
Real newton_tol, Real equil_tol, Real cg_tol,
Uint maxiter, Dim_t verbose) {
Ccoord_t<Dim> resolutions{};
for (auto && tup: akantu::zip(resolutions, file.get_resolutions())) {
std::get<0>(tup) = std::get<1>(tup);
}
constexpr Rcoord_t<Dim> lengths{CcoordOps::get_cube<Dim>(1.)};
constexpr auto form{Formulation::small_strain};
auto cell {make_cell<Dim, Dim>(resolutions, lengths, form)};
file.template setup_cell<Dim>(cell);
std::cout << newton_tol << equil_tol << verbose;
using Delta_t = Eigen::MatrixXd;
using Delta_vec = std::vector<Delta_t>;
Delta_vec Deltas{};
for (int i{0}; i < Dim; ++i) {
for (int j{i}; j < Dim; ++j) {
Eigen::MatrixXd Delta(Dim, Dim);
Delta.setZero();
Delta(i, j) +=.5;
Delta(j, i) +=.5;
Deltas.push_back(Delta);
}
}
SolverCG cg{cell, cg_tol, maxiter, bool(verbose)};
auto results = de_geus(cell, Deltas, cg, newton_tol, verbose);
Delta_vec mean_delta_stresses{};
T4Mat<Real, Dim> C{};
C.setZero();
for (const auto & opt_result: results) {
auto get_mean = [](const auto & vec) {
Eigen::Map<const Eigen::MatrixXd>
matrix(vec.data(),
Dim*Dim, vec.rows()/(Dim*Dim));
auto& mat{ matrix.rowwise().mean()};
Eigen::Matrix<Real, Dim, Dim> mean;
Eigen::Map<Eigen::Matrix<Real, Dim* Dim, 1 >>(mean.data()) = mat;
return mean;
};
std::cout << std::endl<< "mean stress:" << std::endl
<< get_mean(opt_result.stress) << std::endl;
std::cout << "mean strain:" << std::endl
<< get_mean(opt_result.grad) << std::endl;
}
}
void mulib(const filesystem::path & path,
Real newton_tol, Real equil_tol, Real cg_tol,
Uint maxiter, Dim_t verbose) {
MuLibInput file{path};
const auto dim{file.get_dim()};
switch (dim) {
case twoD: {
return mulib_worker<twoD>(file, newton_tol, equil_tol, cg_tol,
maxiter, verbose);
break;
}
case threeD: {
return mulib_worker<threeD>(file, newton_tol, equil_tol, cg_tol,
maxiter, verbose);
break;
}
default:
throw std::runtime_error("only two- and tree-dimensional cases considered");
break;
}
}
} // muSpectre

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