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compute_impulse.cc
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rLIBMULTISCALE LibMultiScale
compute_impulse.cc
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/**
* @file compute_impulse.cc
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
*
* @date Wed Jul 09 21:59:47 2014
*
* @brief This stimulator sets an initial impulse displacement field that will
* generate a wave
*
* @section LICENSE
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* LibMultiScale 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 of the License, or (at your option) any
* later version.
*
* LibMultiScale 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with LibMultiScale. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "compute_impulse.hh"
#include "lib_continuum.hh"
#include "lib_dd.hh"
#include "lib_md.hh"
#include "lm_common.hh"
#include "ref_point_data.hh"
/* -------------------------------------------------------------------------- */
__BEGIN_LIBMULTISCALE__
ComputeImpulse
::
ComputeImpulse
(
const
std
::
string
&
name
)
:
LMObject
(
name
)
{
impulseType
=
Impulse
::
PLANAR
;
direction
=
0
;
center
.
setZero
();
this
->
createInput
(
"domain"
);
this
->
createOutput
(
"output"
)
=
ContainerArray
<
Real
>
(
this
->
getID
()
+
":"
+
"output"
);
}
/* -------------------------------------------------------------------------- */
ComputeImpulse
::~
ComputeImpulse
()
{}
/* -------------------------------------------------------------------------- */
void
ComputeImpulse
::
init
()
{
wave_number
=
2
*
M_PI
/
wave_length
;
}
/* -------------------------------------------------------------------------- */
inline
Real
ComputeImpulse
::
computeScaleImpulse
(
Real
d
)
{
const
Real
k
=
wave_number
;
const
Real
res
=
intensity
*
sin
(
k
*
d
)
*
exp
(
-
k
*
k
/
9
*
d
*
d
);
DUMP
(
"impulse computed: "
<<
d
<<
" "
<<
k
<<
" "
<<
intensity
<<
" => "
<<
res
,
DBG_INFO
);
return
res
;
}
/* -------------------------------------------------------------------------- */
template
<>
inline
UInt
Parser
::
parse
(
Impulse
::
ImpulseType
&
type
,
std
::
stringstream
&
line
,
UInt
)
{
std
::
string
name
;
UInt
nb
=
strNext
(
name
,
line
);
if
(
name
==
"CIRCULAR"
)
type
=
Impulse
::
CIRCULAR
;
else
if
(
name
==
"PLANAR"
)
type
=
Impulse
::
PLANAR
;
else
LM_FATAL
(
"unknown impulse type "
<<
name
);
return
nb
;
}
/* -------------------------------------------------------------------------- */
template
<
typename
Cont
>
void
ComputeImpulse
::
build
(
Cont
&
cont
)
{
constexpr
UInt
Dim
=
Cont
::
Dim
;
this
->
clear
();
auto
&
output
=
this
->
getOutputAsArray
();
for
(
auto
&&
at
:
cont
)
{
if
(
impulseType
==
Impulse
::
PLANAR
)
{
Real
d
=
at
.
position0
()[
direction
]
-
center
[
direction
];
Real
impulse
=
computeScaleImpulse
(
d
);
for
(
UInt
i
=
0
;
i
<
Dim
;
++
i
)
{
if
(
i
==
direction
)
output
.
push_back
(
impulse
);
}
}
else
if
(
impulseType
==
Impulse
::
CIRCULAR
)
{
output
.
resize
(
output
.
rows
(),
Dim
);
Vector
<
Dim
>
vec_dir
=
at
.
position0
()
-
center
.
cast
<
Real
>
().
block
<
Dim
,
1
>
(
0
,
0
);
Real
norm_vec_dir
=
vec_dir
.
norm
();
if
(
norm_vec_dir
==
0.
)
LM_FATAL
(
"Cannot compute a displacement at the center of the circle"
);
vec_dir
/=
norm_vec_dir
;
Real
d
=
norm_vec_dir
-
radius
;
Real
impulse
=
computeScaleImpulse
(
d
);
this
->
getOutputAsArray
().
push_back
(
impulse
*
vec_dir
);
}
}
}
/* -------------------------------------------------------------------------- */
/* LMDESC IMPULSE
This stimulator sets an initial impulse displacement field that will generate
a wave. It can generate planar or circular waves:
- Planar:
.. math::
u(\vec{X}) += I \cdot \sin\left(k d \right) \exp\left(-\frac{(k
d)^2}{9} \right) \vec{e_i}
with :math:`I` the intensity, :math:`i` the chosen direction and
:math:`k = 2\pi/LWAVE` and :math:`d = \vec{X}_i-\vec{C}_i` as defined
with the parameters (see below).
- Circular:
.. math::
u(X) += I \cdot \sin\left(k (d - R) \right) \exp\left(-\frac{(k (d -
R))^2}{9} \right) \frac{\vec{X} - \vec{C}}{d}
with :math:`I` the intensity, :math:`k = 2\pi/LWAVE` and
:math:`d = \mid \vec{X} - \vec{C} \mid` and :math:`R` a
radius as defined with the parameters (see below).
*/
/* LMEXAMPLE COMPUTE impulse IMPULSE INPUT central_md LWAVE WaveLength*r0
* DIRECTION 0 INTENSITY 1.1e-3 ONESHOT 0 */
void
ComputeImpulse
::
declareParams
()
{
/* LMKEYWORD LWAVE
Set the wavelength of the wave to be generated
*/
this
->
parseKeyword
(
"LWAVE"
,
wave_length
);
/* LMKEYWORD DIRECTION
It can be 0,1 or 2 to specify X, Y or Z direction for planar waves
*/
this
->
parseKeyword
(
"DIRECTION"
,
direction
,
0u
);
/* LMKEYWORD RADIUS
Radius to be used to generate the impulse
*/
this
->
parseKeyword
(
"RADIUS"
,
radius
,
0.
);
/* LMKEYWORD INTENSITY
Intensity of the displacement
*/
this
->
parseKeyword
(
"INTENSITY"
,
intensity
);
/* LMKEYWORD CENTER
center of the impulse to be injected
*/
this
->
parseVectorKeyword
(
"CENTER"
,
spatial_dimension
,
center
,
VEC_DEFAULTS
(
0.
,
0.
,
0.
));
/* LMKEYWORD TYPE
Flag to specify the type of impulse.
It can be either CIRCULAR or PLANAR.
Self-explanatory examples are:
- COMPUTE impulse-planar IMPULSE INPUT md LWAVE L0/10 DIRECTION 0
INTENSITY 1e-3 CENTER 0 0
.. image:: images/planar-impulse.png
- COMPUTE impulse-circular IMPULSE INPUT md LWAVE L0/10 TYPE CIRCULAR
RADIUS L0/4 INTENSITY 1e-3 CENTER 0 0
.. image:: images/radial-impulse.png
*/
this
->
parseKeyword
(
"TYPE"
,
impulseType
,
Impulse
::
PLANAR
);
}
/* -------------------------------------------------------------------------- */
DECLARE_COMPUTE_MAKE_CALL
(
ComputeImpulse
)
__END_LIBMULTISCALE__
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