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cell_base.cc
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/**
* @file cell_base.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 01 Nov 2017
*
* @brief Implementation for cell base class
*
* Copyright © 2017 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 "cell/cell_base.hh"
#include "common/ccoord_operations.hh"
#include "common/iterators.hh"
#include "common/tensor_algebra.hh"
#include <sstream>
#include <algorithm>
namespace muSpectre {
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
CellBase<DimS, DimM>::CellBase(Projection_ptr projection_)
:subdomain_resolutions{projection_->get_subdomain_resolutions()},
subdomain_locations{projection_->get_subdomain_locations()},
domain_resolutions{projection_->get_domain_resolutions()},
pixels(subdomain_resolutions, subdomain_locations),
domain_lengths{projection_->get_domain_lengths()},
fields{std::make_unique<FieldCollection_t>()},
F{make_field<StrainField_t>("Gradient", *this->fields)},
P{make_field<StressField_t>("Piola-Kirchhoff-1", *this->fields)},
projection{std::move(projection_)}
{ }
/**
* turns out that the default move container in combination with
* clang segfaults under certain (unclear) cicumstances, because the
* move constructor of the optional appears to be busted in gcc
* 7.2. Copying it (K) instead of moving it fixes the issue, and
* since it is a reference, the cost is practically nil
*/
template <Dim_t DimS, Dim_t DimM>
CellBase<DimS, DimM>::CellBase(CellBase && other):
subdomain_resolutions{std::move(other.subdomain_resolutions)},
subdomain_locations{std::move(other.subdomain_locations)},
domain_resolutions{std::move(other.domain_resolutions)},
pixels{std::move(other.pixels)},
domain_lengths{std::move(other.domain_lengths)},
fields{std::move(other.fields)},
F{other.F},
P{other.P},
K{other.K}, // this seems to segfault under clang if it's not a move
materials{std::move(other.materials)},
projection{std::move(other.projection)}
{ }
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::Material_t &
CellBase<DimS, DimM>::add_material(Material_ptr mat) {
this->materials.push_back(std::move(mat));
return *this->materials.back();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
auto CellBase<DimS, DimM>::get_strain_vector() -> Vector_ref {
return this->get_strain().eigenvec();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
auto CellBase<DimS, DimM>::get_stress_vector() const -> ConstVector_ref {
return this->get_stress().eigenvec();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
void CellBase<DimS, DimM>::
set_uniform_strain(const Eigen::Ref<const Matrix_t> & strain) {
this->F.get_map() = strain;
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
auto CellBase<DimS, DimM>::evaluate_stress() -> ConstVector_ref {
if (not this->initialised) {
this->initialise();
}
for (auto & mat: this->materials) {
mat->compute_stresses(this->F, this->P, this->get_formulation());
}
return this->P.const_eigenvec();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
auto CellBase<DimS, DimM>::
evaluate_stress_tangent() -> std::array<ConstVector_ref, 2> {
if (not this->initialised) {
this->initialise();
}
constexpr bool create_tangent{true};
this->get_tangent(create_tangent);
for (auto & mat: this->materials) {
mat->compute_stresses_tangent(this->F, this->P, this->K.value(),
this->get_formulation());
}
const TangentField_t & k = this->K.value();
return std::array<ConstVector_ref, 2>{
this->P.const_eigenvec(), k.const_eigenvec()};
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
auto CellBase<DimS, DimM>::
evaluate_projected_directional_stiffness
(Eigen::Ref<const Vector_t> delF) -> Vector_ref {
// the following const_cast should be safe, as long as the
// constructed delF_field is const itself
const TypedField<FieldCollection_t, Real> delF_field
("Proxied raw memory for strain increment",
*this->fields,
Eigen::Map<Vector_t>(const_cast<Real *>(delF.data()), delF.size()),
this->F.get_nb_components());
if (!this->K) {
throw std::runtime_error
("currently only implemented for cases where a stiffness matrix "
"exists");
}
if (delF.size() != this->get_nb_dof()) {
std::stringstream err{};
err << "input should be of size ndof = ¶(" << this->subdomain_resolutions
<< ") × " << DimS << "² = "<< this->get_nb_dof() << " but I got "
<< delF.size();
throw std::runtime_error(err.str());
}
const std::string out_name{"δP; temp output for directional stiffness"};
auto & delP = this->get_managed_field(out_name);
auto Kmap{this->K.value().get().get_map()};
auto delPmap{delP.get_map()};
MatrixFieldMap<FieldCollection_t, Real, DimM, DimM, true> delFmap(delF_field);
for (auto && tup:
akantu::zip(Kmap, delFmap, delPmap)) {
auto & k = std::get<0>(tup);
auto & df = std::get<1>(tup);
auto & dp = std::get<2>(tup);
dp = Matrices::tensmult(k, df);
}
return Vector_ref(this->project(delP).data(), this->get_nb_dof());
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
std::array<Dim_t, 2> CellBase<DimS, DimM>::get_strain_shape() const {
return this->projection->get_strain_shape();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
void CellBase<DimS, DimM>::apply_projection(Eigen::Ref<Vector_t> vec) {
TypedField<FieldCollection_t, Real> field("Proxy for projection",
*this->fields,
vec,
this->F.get_nb_components());
this->projection->apply_projection(field);
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::FullResponse_t
CellBase<DimS, DimM>::evaluate_stress_tangent(StrainField_t & grad) {
if (this->initialised == false) {
this->initialise();
}
//! High level compatibility checks
if (grad.size() != this->F.size()) {
throw std::runtime_error("Size mismatch");
}
constexpr bool create_tangent{true};
this->get_tangent(create_tangent);
for (auto & mat: this->materials) {
mat->compute_stresses_tangent(grad, this->P, this->K.value(),
this->get_formulation());
}
return std::tie(this->P, this->K.value());
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::StressField_t &
CellBase<DimS, DimM>::directional_stiffness(const TangentField_t &K,
const StrainField_t &delF,
StressField_t &delP) {
for (auto && tup:
akantu::zip(K.get_map(), delF.get_map(), delP.get_map())){
auto & k = std::get<0>(tup);
auto & df = std::get<1>(tup);
auto & dp = std::get<2>(tup);
dp = Matrices::tensmult(k, df);
}
return this->project(delP);
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::Vector_ref
CellBase<DimS, DimM>::directional_stiffness_vec(const Eigen::Ref<const Vector_t> &delF) {
if (!this->K) {
throw std::runtime_error
("currently only implemented for cases where a stiffness matrix "
"exists");
}
if (delF.size() != this->get_nb_dof()) {
std::stringstream err{};
err << "input should be of size ndof = ¶(" << this->subdomain_resolutions
<< ") × " << DimS << "² = "<< this->get_nb_dof() << " but I got "
<< delF.size();
throw std::runtime_error(err.str());
}
const std::string out_name{"temp output for directional stiffness"};
const std::string in_name{"temp input for directional stiffness"};
auto & out_tempref = this->get_managed_field(out_name);
auto & in_tempref = this->get_managed_field(in_name);
Vector_ref(in_tempref.data(), this->get_nb_dof()) = delF;
this->directional_stiffness(this->K.value(), in_tempref, out_tempref);
return Vector_ref(out_tempref.data(), this->get_nb_dof());
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
Eigen::ArrayXXd
CellBase<DimS, DimM>::
directional_stiffness_with_copy
(Eigen::Ref<Eigen::ArrayXXd> delF) {
if (!this->K) {
throw std::runtime_error
("currently only implemented for cases where a stiffness matrix "
"exists");
}
const std::string out_name{"temp output for directional stiffness"};
const std::string in_name{"temp input for directional stiffness"};
auto & out_tempref = this->get_managed_field(out_name);
auto & in_tempref = this->get_managed_field(in_name);
in_tempref.eigen() = delF;
this->directional_stiffness(this->K.value(), in_tempref, out_tempref);
return out_tempref.eigen();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::StressField_t &
CellBase<DimS, DimM>::project(StressField_t &field) {
this->projection->apply_projection(field);
return field;
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::StrainField_t &
CellBase<DimS, DimM>::get_strain() {
if (this->initialised == false) {
this->initialise();
}
return this->F;
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
const typename CellBase<DimS, DimM>::StressField_t &
CellBase<DimS, DimM>::get_stress() const {
return this->P;
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
const typename CellBase<DimS, DimM>::TangentField_t &
CellBase<DimS, DimM>::get_tangent(bool create) {
if (!this->K) {
if (create) {
this->K = make_field<TangentField_t>("Tangent Stiffness", *this->fields);
} else {
throw std::runtime_error
("K does not exist");
}
}
return this->K.value();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::StrainField_t &
CellBase<DimS, DimM>::get_managed_field(std::string unique_name) {
if (!this->fields->check_field_exists(unique_name)) {
return make_field<StressField_t>(unique_name, *this->fields);
} else {
return static_cast<StressField_t&>(this->fields->at(unique_name));
}
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
void CellBase<DimS, DimM>::initialise(FFT_PlanFlags flags) {
// check that all pixels have been assigned exactly one material
this->check_material_coverage();
for (auto && mat: this->materials) {
mat->initialise();
}
// resize all global fields (strain, stress, etc)
this->fields->initialise(this->subdomain_resolutions, this->subdomain_locations);
// initialise the projection and compute the fft plan
this->projection->initialise(flags);
this->initialised = true;
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
void CellBase<DimS, DimM>::save_history_variables() {
for (auto && mat: this->materials) {
mat->save_history_variables();
}
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::iterator
CellBase<DimS, DimM>::begin() {
return this->pixels.begin();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
typename CellBase<DimS, DimM>::iterator
CellBase<DimS, DimM>::end() {
return this->pixels.end();
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
auto CellBase<DimS, DimM>::get_adaptor() -> Adaptor {
return Adaptor(*this);
}
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
void CellBase<DimS, DimM>::check_material_coverage() {
auto nb_pixels = CcoordOps::get_size(this->subdomain_resolutions);
std::vector<MaterialBase<DimS, DimM>*> assignments(nb_pixels, nullptr);
for (auto & mat: this->materials) {
for (auto & pixel: *mat) {
auto index = CcoordOps::get_index(this->subdomain_resolutions,
this->subdomain_locations,
pixel);
auto& assignment{assignments.at(index)};
if (assignment != nullptr) {
std::stringstream err{};
err << "Pixel " << pixel << "is already assigned to material '"
<< assignment->get_name()
<< "' and cannot be reassigned to material '" << mat->get_name();
throw std::runtime_error(err.str());
} else {
assignments[index] = mat.get();
}
}
}
// find and identify unassigned pixels
std::vector<Ccoord> unassigned_pixels;
for (size_t i = 0; i < assignments.size(); ++i) {
if (assignments[i] == nullptr) {
unassigned_pixels.push_back(
CcoordOps::get_ccoord(this->subdomain_resolutions,
this->subdomain_locations, i));
}
}
if (unassigned_pixels.size() != 0) {
std::stringstream err {};
err << "The following pixels have were not assigned a material: ";
for (auto & pixel: unassigned_pixels) {
err << pixel << ", ";
}
err << "and that cannot be handled";
throw std::runtime_error(err.str());
}
}
template class CellBase<twoD, twoD>;
template class CellBase<threeD, threeD>;
} // muSpectre

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