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volume_potential.cpp
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Sun, Nov 17, 19:55

volume_potential.cpp
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2024 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
* Copyright (©) 2020-2024 Lucas Frérot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "volume_potential.hh"
#include "model.hh"
#include <algorithm>
/* -------------------------------------------------------------------------- */
namespace tamaas {
template <model_type type>
VolumePotential<type>::VolumePotential(Model* model)
: IntegralOperator(model), wavevectors(), source_buffer(), out_buffer(),
engine(FFTEngine::makeEngine()) {
// Copy horizontal sizes
std::array<UInt, trait::boundary_dimension> sizes;
std::copy_n(model->getDiscretization().begin() + 1, trait::boundary_dimension,
sizes.begin());
auto hermitian_sizes =
GridHermitian<Real, trait::boundary_dimension>::hermitianDimensions(
sizes);
wavevectors =
FFTEngine::template computeFrequencies<Real, trait::boundary_dimension,
true>(hermitian_sizes);
// Normalize wavevectors
auto system_size = model->getBoundarySystemSize();
VectorProxy<const Real, trait::boundary_dimension> boundary_domain{
system_size[0]};
wavevectors *= 2 * M_PI;
wavevectors /= boundary_domain;
wavevectors *= -1.; // < this is important for the convolution computation
}
/* -------------------------------------------------------------------------- */
template <model_type type>
model_type VolumePotential<type>::getType() const {
return this->model->getType();
}
/* -------------------------------------------------------------------------- */
template <model_type type>
void VolumePotential<type>::initialize(UInt source_components,
UInt out_components,
UInt out_buffer_size) {
auto hermitian_sizes =
GridHermitian<Real, trait::boundary_dimension>::hermitianDimensions(
this->model->getBoundaryDiscretization());
// Initializing buffers
this->source_buffer.resize(this->model->getDiscretization()[0]);
this->out_buffer.resize(out_buffer_size);
// Resizing source buffer
std::for_each(this->source_buffer.begin(), this->source_buffer.end(),
[&](auto& buffer) {
buffer.setNbComponents(source_components);
buffer.resize(hermitian_sizes);
});
// Resizing output buffer
std::for_each(this->out_buffer.begin(), this->out_buffer.end(),
[&](auto& buffer) {
buffer.setNbComponents(out_components);
buffer.resize(hermitian_sizes);
});
}
/* -------------------------------------------------------------------------- */
template <model_type type>
void VolumePotential<type>::transformSource(GridBase<Real>& in,
filter_t pred) const {
constexpr UInt dim = trait::dimension;
auto& i = dynamic_cast<Grid<Real, dim>&>(in);
// Transforming source
for (UInt layer : Loop::range(i.sizes().front())) {
if (not pred(layer))
continue;
auto in_layer = make_view(i, layer);
engine->forward(in_layer, source_buffer[layer]);
}
for (auto&& layer : out_buffer)
layer = 0;
}
/* -------------------------------------------------------------------------- */
/* Template instanciation */
/* -------------------------------------------------------------------------- */
template class VolumePotential<model_type::volume_1d>;
template class VolumePotential<model_type::volume_2d>;
} // namespace tamaas

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