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projection_finite_strain_fast.hh
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projection_finite_strain_fast.hh
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/**
* @file projection_finite_strain_fast.hh
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 12 Dec 2017
*
* @brief Faster alternative to ProjectionFinitestrain
*
* Copyright © 2017 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.
*/
#ifndef SRC_FFT_PROJECTION_FINITE_STRAIN_FAST_HH_
#define SRC_FFT_PROJECTION_FINITE_STRAIN_FAST_HH_
#include "fft/projection_base.hh"
#include "common/common.hh"
#include "common/field_collection.hh"
#include "common/field_map.hh"
namespace muSpectre {
/**
* replaces `muSpectre::ProjectionFiniteStrain` with a faster and
* less memory-hungry alternative formulation. Use this if you don't
* have a very good reason not to (and tell me (author) about it,
* I'd be interested to hear it).
*/
template <Dim_t DimS, Dim_t DimM>
class ProjectionFiniteStrainFast : public ProjectionBase<DimS, DimM> {
public:
using Parent = ProjectionBase<DimS, DimM>; //!< base class
//! polymorphic pointer to FFT engines
using FFTEngine_ptr = typename Parent::FFTEngine_ptr;
using Ccoord = typename Parent::Ccoord; //!< cell coordinates type
using Rcoord = typename Parent::Rcoord; //!< spatial coordinates type
//! global field collection (for real-space representations)
using GFieldCollection_t = GlobalFieldCollection<DimS>;
//! local field collection (for Fourier-space representations)
using LFieldCollection_t = LocalFieldCollection<DimS>;
//! Real space second order tensor fields (to be projected)
using Field_t = TypedField<GFieldCollection_t, Real>;
//! Fourier-space field containing the projection operator itself
using Proj_t = TensorField<LFieldCollection_t, Real, firstOrder, DimM>;
//! iterable form of the operator
using Proj_map = MatrixFieldMap<LFieldCollection_t, Real, DimM, 1>;
//! iterable Fourier-space second-order tensor field
using Grad_map = MatrixFieldMap<LFieldCollection_t, Complex, DimM, DimM>;
//! Default constructor
ProjectionFiniteStrainFast() = delete;
//! Constructor with fft_engine
ProjectionFiniteStrainFast(FFTEngine_ptr engine, Rcoord lengths);
//! Copy constructor
ProjectionFiniteStrainFast(const ProjectionFiniteStrainFast & other) =
delete;
//! Move constructor
ProjectionFiniteStrainFast(ProjectionFiniteStrainFast && other) = default;
//! Destructor
virtual ~ProjectionFiniteStrainFast() = default;
//! Copy assignment operator
ProjectionFiniteStrainFast &
operator=(const ProjectionFiniteStrainFast & other) = delete;
//! Move assignment operator
ProjectionFiniteStrainFast &
operator=(ProjectionFiniteStrainFast && other) = default;
//! initialises the fft engine (plan the transform)
void initialise(FFT_PlanFlags flags = FFT_PlanFlags::estimate) final;
//! apply the projection operator to a field
void apply_projection(Field_t & field) final;
Eigen::Map<Eigen::ArrayXXd> get_operator() final;
/**
* returns the number of rows and cols for the strain matrix type
* (for full storage, the strain is stored in material_dim ×
* material_dim matrices, but in symmetriy storage, it is a column
* vector)
*/
std::array<Dim_t, 2> get_strain_shape() const final;
constexpr static Dim_t NbComponents() { return ipow(DimM, 2); }
protected:
Proj_t & xiField; //!< field of normalised wave vectors
Proj_map xis; //!< iterable normalised wave vectors
private:
};
} // namespace muSpectre
#endif // SRC_FFT_PROJECTION_FINITE_STRAIN_FAST_HH_

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