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muSpectre/tests/test_projection_finite.cc
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test_projection_finite.cc
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/**
* file test_projection_finite.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 07 Dec 2017
*
* @brief tests for standard finite strain projection operator
*
* @section LICENCE
*
* Copyright (C) 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 <boost/mpl/list.hpp>
#include "boost/range/combine.hpp"
#include "tests.hh"
#include "fft/fftw_engine.hh"
#include "fft/projection_finite_strain.hh"
#include "common/common.hh"
#include "common/field_collection.hh"
#include "common/field_map.hh"
namespace muSpectre {
BOOST_AUTO_TEST_SUITE(projection_finite_strain);
/* ---------------------------------------------------------------------- */
template <Dim_t DimS>
struct Sizes {
};
template<>
struct Sizes<twoD> {
constexpr static Ccoord_t<twoD> get_value() {
return Ccoord_t<twoD>{3, 5};}
};
template<>
struct Sizes<threeD> {
constexpr static Ccoord_t<threeD> get_value() {
return Ccoord_t<threeD>{3, 5, 7};}
};
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
struct ProjectionFixture {
using Engine = FFTW_Engine<DimS, DimM>;
using Parent = ProjectionFiniteStrain<DimS, DimM>;
constexpr static Dim_t sdim{DimS};
constexpr static Dim_t mdim{DimM};
ProjectionFixture(): engine{Sizes<DimS>::get_value()},
projector(engine){}
Engine engine;
Parent projector;
};
/* ---------------------------------------------------------------------- */
using fixlist = boost::mpl::list<ProjectionFixture<twoD, twoD>,
ProjectionFixture<threeD, threeD>>;
/* ---------------------------------------------------------------------- */
BOOST_FIXTURE_TEST_CASE_TEMPLATE(constructor_test, fix, fixlist, fix) {
BOOST_CHECK_NO_THROW(fix::projector.initialise(FFT_PlanFlags::estimate));
}
/* ---------------------------------------------------------------------- */
using F3 = ProjectionFixture<threeD, threeD>;
BOOST_FIXTURE_TEST_CASE(Helmholtz_decomposition, F3) {
// create a field that is explicitely the sum of a gradient and a
// curl, then verify that the projected field corresponds to the
// gradient (without the zero'th component)
using Fields = FieldCollection<sdim, mdim>;
Fields fields{};
using FieldT = TensorField<Fields, Real, secondOrder, mdim>;
using FieldMap = MatrixFieldMap<Fields, Real, mdim, mdim>;
FieldT & f_grad{make_field<FieldT>("gradient", fields)};
FieldT & f_curl{make_field<FieldT>("curl", fields)};
FieldT & f_sum{make_field<FieldT>("sum", fields)};
FieldT & f_var{make_field<FieldT>("working field", fields)};
FieldMap grad(f_grad);
FieldMap curl(f_curl);
FieldMap sum(f_sum);
FieldMap var(f_var);
fields.initialise(Sizes<sdim>::get_value());
for (auto && tup: boost::combine(fields, grad, curl, sum, var)) {
auto & ccoord = boost::get<0>(tup);
auto & g = boost::get<1>(tup);
auto & c = boost::get<2>(tup);
auto & s = boost::get<3>(tup);
auto & v = boost::get<4>(tup);
auto vec = CcoordOps::get_vector(ccoord);
g.row(0) << vec(1)*vec(2), vec(0)*vec(2), vec(1)*vec(2);
c.row(0) << 0, vec(0)*vec(1), -vec(0)*vec(2);
v.row(0) = s.row(0) = g.row(0) + c.row(0);
}
projector.initialise(FFT_PlanFlags::estimate);
projector.apply_projection(f_var);
for (auto && tup: boost::combine(fields, grad, curl, sum, var)) {
auto & ccoord = boost::get<0>(tup);
auto & g = boost::get<1>(tup);
auto & c = boost::get<2>(tup);
auto & s = boost::get<3>(tup);
auto & v = boost::get<4>(tup);
auto vec = CcoordOps::get_vector(ccoord);
Real error = (s-g).norm();
BOOST_CHECK_LT(error, tol);
if (error >=tol) {
std::cout << std::endl << "grad_ref :" << std::endl << g << std::endl;
std::cout << std::endl << "grad_proj :" << std::endl << v << std::endl;
std::cout << std::endl << "curl :" << std::endl << c << std::endl;
std::cout << std::endl << "sum :" << std::endl << s << std::endl;
std::cout << std::endl << "ccoord :" << std::endl << ccoord << std::endl;
std::cout << std::endl << "vector :" << std::endl << vec.transpose() << std::endl;
}
}
}
BOOST_AUTO_TEST_SUITE_END();
} // muSpectre
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