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projection_small_strain.cc
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rMUSPECTRE µSpectre
projection_small_strain.cc
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/**
* @file projection_small_strain.cc
*
* @author Till Junge <till.junge@altermail.ch>
*
* @date 14 Jan 2018
*
* @brief Implementation for ProjectionSmallStrain
*
* Copyright © 2018 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 "fft/projection_small_strain.hh"
#include "fft/fft_utils.hh"
namespace
muSpectre
{
/* ---------------------------------------------------------------------- */
template
<
Dim_t
DimS
,
Dim_t
DimM
>
ProjectionSmallStrain
<
DimS
,
DimM
>::
ProjectionSmallStrain
(
FFT_Engine_ptr
engine
)
:
Parent
{
std
::
move
(
engine
),
Formulation
::
small_strain
}
{}
/* ---------------------------------------------------------------------- */
template
<
Dim_t
DimS
,
Dim_t
DimM
>
void
ProjectionSmallStrain
<
DimS
,
DimM
>::
initialise
(
FFT_PlanFlags
flags
)
{
Parent
::
initialise
(
flags
);
FFT_freqs
<
DimS
>
fft_freqs
(
this
->
fft_engine
->
get_resolutions
(),
this
->
fft_engine
->
get_lengths
());
for
(
auto
&&
tup:
akantu
::
zip
(
*
this
->
fft_engine
,
this
->
Ghat
))
{
const
auto
&
ccoord
=
std
::
get
<
0
>
(
tup
);
auto
&
G
=
std
::
get
<
1
>
(
tup
);
auto
xi
=
fft_freqs
.
get_unit_xi
(
ccoord
);
auto
kron
=
[](
const
Dim_t
i
,
const
Dim_t
j
)
->
Real
{
return
(
i
==
j
)
?
1.
:
0.
;
};
for
(
Dim_t
i
{
0
};
i
<
DimS
;
++
i
)
{
for
(
Dim_t
j
{
0
};
j
<
DimS
;
++
j
)
{
for
(
Dim_t
l
{
0
};
l
<
DimS
;
++
l
)
{
for
(
Dim_t
m
{
0
};
m
<
DimS
;
++
m
)
{
Real
&
g
=
get
(
G
,
i
,
j
,
l
,
m
);
g
=
0.5
*
(
xi
(
i
)
*
kron
(
j
,
l
)
*
xi
(
m
)
+
xi
(
i
)
*
kron
(
j
,
m
)
*
xi
(
l
)
+
xi
(
j
)
*
kron
(
i
,
l
)
*
xi
(
m
)
+
xi
(
j
)
*
kron
(
i
,
m
)
*
xi
(
l
))
-
xi
(
i
)
*
xi
(
j
)
*
xi
(
l
)
*
xi
(
m
);
}
}
}
}
}
this
->
Ghat
[
0
].
setZero
();
}
template
class
ProjectionSmallStrain
<
twoD
,
twoD
>
;
template
class
ProjectionSmallStrain
<
threeD
,
threeD
>
;
}
// muSpectre
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