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Tue, Nov 19, 23:30

mulib_input.cc
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/**
* file mulib_input.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 20 Sep 2018
*
* @brief implementation of the µLib input file reader
*
* 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 "io/mulib_input.hh"
#include "materials/material_linear_elastic_generic.hh"
#include "cell/cell_base.hh"
#include "common/ccoord_operations.hh"
#include <ncException.h>
#include <sstream>
#include <system_error>
#include <numeric>
#include <vector>
#include <functional>
namespace muSpectre {
MuLibInput::MuLibInput(filesystem::path path):
path(path),
file(path.native(), netCDF::NcFile::FileMode::read,
netCDF::NcFile::FileFormat::classic)
{
file_error_code ec{};
if (not filesystem::is_regular_file(path, ec)) {
std::stringstream err_str{};
err_str << "Path '" << path.native()
<< "' does not point to a regular file";
throw filesystem::filesystem_error(err_str.str(), path, ec);
}
if (this->file.isNull()) {
std::stringstream err_str{};
err_str << "Could not open file '" << path.native() << "'";
throw std::runtime_error(err_str.str());
}
// the microstructure is stored as an array of ints
this->micro_structure = this->file.getVar("materialIndices");
if (micro_structure.isNull()) {
throw std::runtime_error("Could not read material indices");
}
const auto micro_structure_dims{micro_structure.getDims()};
for (auto & dim: micro_structure_dims) {
this->resolutions.push_back(dim.getSize());
if (not (this->resolutions.back() % 2)) {
--this->resolutions.back();
}
}
// material labels contain a list of integer indices corresponding
// to the material indices stored in the microstructure array.
auto mat_labels_var{this->file.getVar("materialLabels")};
if (mat_labels_var.isNull()) {
throw std::runtime_error("Could not read material labels");
}
auto mat_labels_dims{mat_labels_var.getDims()};
this->nb_materials = file.getDim("m").getSize();
this->mat_labels.resize(this->nb_materials);
mat_labels_var.getVar(this->mat_labels.data());
// finally, the material parameters are given in form of a
// stiffness tensor per material
this->mat_params =this->file.getVar("materialStiffnesses");
if (mat_params.isNull()) {
throw std::runtime_error("Could not read stiffness tensors");
}
auto mat_params_dims{mat_params.getDims()};
// make sure the size of the stiffness tensors make sense
{
const auto dim{this->get_dim()};
if (not (size_t(vsize(dim)) == file.getDim("row").getSize()) or
not (size_t(vsize(dim)) == file.getDim("col").getSize())) {
std::stringstream err_str{};
err_str << "expected stiffness tensors of shape " << vsize(dim)
<< " × " << vsize(dim) << " but got "
<< file.getDim("row").getSize() << " × "
<< file.getDim("col").getSize() << ".";
throw std::runtime_error(err_str.str());
}
}
}
/* ---------------------------------------------------------------------- */
Dim_t MuLibInput::get_dim() const {
return this->resolutions.size();
}
/* ---------------------------------------------------------------------- */
const std::vector<Dim_t> & MuLibInput::get_resolutions() const {
return this->resolutions;
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
void MuLibInput::setup_cell(CellBase<DimS, DimS>& cell) {
using Material_t = MaterialLinearElasticGeneric<DimS, DimS>;
using MatVec_t = std::vector<std::reference_wrapper<Material_t>>;
MatVec_t materials{};
std::map<Dim_t, size_t> lookup;
constexpr auto t_size = size_t(vsize(DimS));
for (int m{0}; m < this->get_nb_materials(); ++m) {
const auto & label{this->mat_labels[m]};
std::stringstream name_str{};
name_str << "Material " << label << " in file '"
<< this->path.native() << "'";
Eigen::Matrix<Real, t_size, t_size> tensor;
// I can get away with neglecting the row-major netcdf format
// because stiffness tensors are symmetric
this->mat_params.getVar({size_t(m), 0, 0},
{1, t_size, t_size}, tensor.data());
std::cout << "stiffness tensor for material " << label << std::endl;
std::cout << tensor << std::endl << std::endl;
materials.emplace_back( Material_t::make(cell, name_str.str(), tensor));
lookup[label] = m;
}
// assign materials
Ccoord_t<DimS> res{};
for(auto && tup: akantu::zip(res, this->resolutions)) {
std::get<0>(tup) = std::get<1>(tup);
}
std::vector<size_t> vec_pixel(DimS);
for (auto && pixel: CcoordOps::Pixels<DimS>(res)) {
for (int i{0}; i < DimS; ++i) {
vec_pixel[i] = pixel[i];
}
Dim_t label;
this->micro_structure.getVar(vec_pixel, &label);
materials[lookup[label]].get().add_pixel(pixel);
}
cell.initialise(FFT_PlanFlags::measure);
}
template void MuLibInput::setup_cell(CellBase< twoD, twoD> &);
template void MuLibInput::setup_cell(CellBase<threeD, threeD> &);
} // muSpectre

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