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bem_fft_base.cpp
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Sat, Oct 19, 20:28
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rTAMAAS tamaas
bem_fft_base.cpp
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/**
* @file
* @section LICENSE
*
* Copyright (©) 2016-19 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* 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 "bem_fft_base.hh"
/* -------------------------------------------------------------------------- */
#include "bem_meta_functional.hh"
#include "elastic_energy_functional.hh"
#include "fft_plan_manager.hh"
#include "surface_statistics.hh"
#include "legacy_types.hh"
/* -------------------------------------------------------------------------- */
#include <omp.h>
/* -------------------------------------------------------------------------- */
namespace
tamaas
{
/* -------------------------------------------------------------------------- */
BemFFTBase
::
BemFFTBase
(
Surface
<
Real
>&
p
)
:
BemInterface
(
p
),
functional
(
new
MetaFunctional
(
*
this
)),
surface_tractions
(
p
.
size
(),
p
.
getL
()),
surface_displacements
(
p
.
size
(),
p
.
getL
()),
surface_spectral_input
(
p
.
size
(),
p
.
getL
()),
surface_spectral_output
(
p
.
size
(),
p
.
getL
()),
surface_spectral_influence_disp
(
p
.
size
(),
p
.
getL
()),
true_displacements
(
p
.
size
(),
p
.
getL
()),
old_displacements
(
p
.
size
(),
p
.
getL
()),
gap
(
p
.
size
(),
p
.
getL
()),
e_star
(
std
::
nan
(
""
)),
tmp_coeff
(
1.
/
M_PI
)
{
// this->setNumberOfThreads(this->nthreads);
max_iterations
=
5000
;
dump_freq
=
100
;
this
->
functional
->
addFunctionalTerm
(
new
ElasticEnergyFunctional
(
*
this
));
std
::
cerr
<<
this
<<
" is setting up the surfaces"
;
std
::
cerr
<<
&
p
<<
" has size "
<<
p
.
size
()
<<
std
::
endl
;
}
/* -------------------------------------------------------------------------- */
BemFFTBase
::~
BemFFTBase
()
{
FFTPlanManager
::
get
().
clean
();
}
/* -------------------------------------------------------------------------- */
const
Surface
<
Real
>&
BemFFTBase
::
getTractions
()
const
{
return
surface_tractions
;
}
/* -------------------------------------------------------------------------- */
const
Surface
<
Real
>&
BemFFTBase
::
getDisplacements
()
const
{
return
surface_displacements
;
}
/* -------------------------------------------------------------------------- */
const
Surface
<
Real
>&
BemFFTBase
::
getSpectralInfluenceOverDisplacement
()
{
return
surface_spectral_influence_disp
;
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
setEffectiveModulus
(
Real
e_star
)
{
this
->
e_star
=
e_star
;
this
->
computeSpectralInfluenceOverDisplacement
();
}
/* -------------------------------------------------------------------------- */
Real
BemFFTBase
::
getEffectiveModulus
()
{
return
this
->
e_star
;
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
computeSpectralInfluenceOverDisplacement
()
{
// if (std::isnan(tmp_coeff)) SURFACE_FATAL("constant tmp_coeff is nan");
// if (std::isnan(e_star)) SURFACE_FATAL("constant e_star is nan");
const
Real
L
=
surface
.
getL
();
auto
wavevectors
=
FFTransform
<
Real
,
2
>::
computeFrequencies
<
true
>
(
surface_spectral_influence_disp
.
sizes
());
auto
inf_it
=
surface_spectral_influence_disp
.
begin
(),
inf_begin
=
surface_spectral_influence_disp
.
begin
();
auto
end
=
wavevectors
.
end
(
2
);
//#pragma omp parallel for firstprivate(inf_it)
for
(
auto
it
=
wavevectors
.
begin
(
2
);
it
<
end
;
++
it
)
{
inf_it
=
inf_begin
;
inf_it
+=
it
-
wavevectors
.
begin
(
2
);
legacy
::
VectorProxy
<
Real
>
q_vec
(
&
(
*
it
),
2
);
q_vec
*=
2
*
M_PI
/
L
;
Real
q
=
q_vec
.
l2norm
();
// Influence function
*
inf_it
=
2.
/
(
q
*
e_star
);
}
surface_spectral_influence_disp
(
0
)
=
0.
;
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
computeDisplacementsFromTractions
()
{
this
->
applyInfluenceFunctions
(
surface_tractions
,
surface_displacements
);
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
computeTractionsFromDisplacements
()
{
this
->
applyInverseInfluenceFunctions
(
surface_displacements
,
surface_tractions
);
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
applyInfluenceFunctions
(
Surface
<
Real
>&
input
,
Surface
<
Real
>&
output
)
{
FFTransform
<
Real
,
2
>&
plan1
=
FFTPlanManager
::
get
().
createPlan
(
input
,
surface_spectral_output
);
plan1
.
forwardTransform
();
surface_spectral_output
*=
surface_spectral_influence_disp
;
FFTransform
<
Real
,
2
>&
plan2
=
FFTPlanManager
::
get
().
createPlan
(
output
,
surface_spectral_output
);
plan2
.
backwardTransform
();
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
applyInverseInfluenceFunctions
(
Surface
<
Real
>&
input
,
Surface
<
Real
>&
output
)
{
FFTransform
<
Real
,
2
>&
plan1
=
FFTPlanManager
::
get
().
createPlan
(
input
,
surface_spectral_output
);
plan1
.
forwardTransform
();
surface_spectral_output
/=
surface_spectral_influence_disp
;
surface_spectral_output
(
0
)
=
0
;
FFTransform
<
Real
,
2
>&
plan2
=
FFTPlanManager
::
get
().
createPlan
(
output
,
surface_spectral_output
);
plan2
.
backwardTransform
();
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
computeGaps
()
{
UInt
size
=
surface
.
size
();
#pragma omp parallel for
for
(
UInt
i
=
0
;
i
<
size
*
size
;
i
++
)
{
gap
(
i
)
=
true_displacements
(
i
)
-
surface
(
i
);
}
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
computeTrueDisplacements
()
{
this
->
true_displacements
=
this
->
surface_displacements
;
UInt
n
=
surface
.
size
();
UInt
size
=
n
*
n
;
Real
shift
=
1e300
;
for
(
UInt
i
=
0
;
i
<
size
;
++
i
)
{
if
(
surface_displacements
(
i
)
-
shift
-
surface
(
i
)
<
0.
)
{
shift
=
surface_displacements
(
i
)
-
surface
(
i
);
}
}
for
(
UInt
i
=
0
;
i
<
size
;
++
i
)
{
true_displacements
(
i
)
=
surface_displacements
(
i
)
-
shift
;
}
}
/* -------------------------------------------------------------------------- */
void
BemFFTBase
::
addFunctional
(
Functional
*
new_funct
)
{
this
->
functional
->
addFunctionalTerm
(
new_funct
);
}
/* -------------------------------------------------------------------------- */
}
// namespace tamaas
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