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test_solid_mechanics_model_bar_traction2d.cc
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Fri, Sep 13, 11:37
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rAKA akantu
test_solid_mechanics_model_bar_traction2d.cc
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/**
* @file test_solid_mechanics_model_bar_traction2d.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Sep 03 2010
* @date last modification: Tue Sep 02 2014
*
* @brief test of the class SolidMechanicsModel
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu 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.
*
* Akantu 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 Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include <limits>
#include <fstream>
#include <iostream>
/* -------------------------------------------------------------------------- */
#include "aka_common.hh"
#include "mesh.hh"
#include "mesh_io.hh"
#include "mesh_io_msh.hh"
#include "solid_mechanics_model.hh"
#include "material.hh"
/* -------------------------------------------------------------------------- */
#ifdef AKANTU_USE_IOHELPER
# include "io_helper.hh"
iohelper
::
ElemType
paraview_type
=
iohelper
::
TRIANGLE2
;
#endif
//AKANTU_USE_IOHELPER
//#define CHECK_STRESS
akantu
::
ElementType
type
=
akantu
::
_triangle_6
;
akantu
::
SolidMechanicsModel
*
model
;
akantu
::
UInt
spatial_dimension
=
2
;
akantu
::
UInt
nb_nodes
;
akantu
::
UInt
nb_element
;
akantu
::
UInt
nb_quadrature_points
;
int
main
(
int
argc
,
char
*
argv
[])
{
akantu
::
initialize
(
"material.dat"
,
argc
,
argv
);
akantu
::
UInt
max_steps
=
5000
;
akantu
::
Real
time_factor
=
0.8
;
akantu
::
Mesh
mesh
(
spatial_dimension
);
mesh
.
read
(
"bar2.msh"
);
akantu
::
SolidMechanicsModel
model
(
mesh
);
nb_nodes
=
mesh
.
getNbNodes
();
nb_element
=
mesh
.
getNbElement
(
type
);
/// model initialization
model
.
initFull
();
std
::
cout
<<
model
.
getMaterial
(
0
)
<<
std
::
endl
;
model
.
initMaterials
();
model
.
assembleMassLumped
();
mesh
.
createGroupsFromMeshData
<
std
::
string
>
(
"physical_names"
);
/// boundary conditions
akantu
::
Real
eps
=
1e-16
;
const
akantu
::
Array
<
akantu
::
Real
>
&
pos
=
mesh
.
getNodes
();
akantu
::
Array
<
akantu
::
Real
>
&
disp
=
model
.
getDisplacement
();
akantu
::
Array
<
bool
>
&
boun
=
model
.
getBlockedDOFs
();
for
(
akantu
::
UInt
i
=
0
;
i
<
nb_nodes
;
++
i
)
{
if
(
pos
(
i
,
0
)
>=
9.
)
disp
(
i
,
0
)
=
(
pos
(
i
,
0
)
-
9
)
/
100.
;
if
(
pos
(
i
)
<=
eps
)
boun
(
i
,
0
)
=
true
;
if
(
pos
(
i
,
1
)
<=
eps
||
pos
(
i
,
1
)
>=
1
-
eps
)
boun
(
i
,
1
)
=
true
;
}
/// set the time step
akantu
::
Real
time_step
=
model
.
getStableTimeStep
()
*
time_factor
;
std
::
cout
<<
"Time Step = "
<<
time_step
<<
"s"
<<
std
::
endl
;
model
.
setTimeStep
(
time_step
);
/// initialize the paraview output
model
.
updateResidual
();
mesh
.
setBaseName
(
"bar_traction_2d"
);
model
.
addDumpField
(
"displacement"
);
model
.
addDumpField
(
"mass"
);
model
.
addDumpField
(
"velocity"
);
model
.
addDumpField
(
"acceleration"
);
model
.
addDumpField
(
"force"
);
model
.
addDumpField
(
"residual"
);
model
.
addDumpFieldTensor
(
"stress"
);
model
.
addDumpField
(
"grad_u"
);
model
.
addDumpGroupField
(
"displacement"
,
"Top"
);
model
.
dumpGroup
(
"Top"
);
model
.
dump
();
#ifdef CHECK_STRESS
std
::
ofstream
outfile
;
outfile
.
open
(
"stress"
);
#endif
// CHECK_STRESS
std
::
ofstream
energy
;
energy
.
open
(
"energy_bar_2d.csv"
);
energy
<<
"id,rtime,epot,ekin,tot"
<<
std
::
endl
;
for
(
akantu
::
UInt
s
=
1
;
s
<=
max_steps
;
++
s
)
{
model
.
explicitPred
();
model
.
updateResidual
();
model
.
updateAcceleration
();
model
.
explicitCorr
();
akantu
::
Real
epot
=
model
.
getPotentialEnergy
();
akantu
::
Real
ekin
=
model
.
getKineticEnergy
();
energy
<<
s
<<
","
<<
(
s
-
1
)
*
time_step
<<
","
<<
epot
<<
","
<<
ekin
<<
","
<<
epot
+
ekin
<<
std
::
endl
;
#ifdef CHECK_STRESS
/// search the position of the maximum of stress to determine the wave speed
akantu
::
Real
max_stress
=
std
::
numeric_limits
<
akantu
::
Real
>::
min
();
akantu
::
Real
*
stress
=
model
.
getMaterial
(
0
).
getStress
(
type
).
storage
();
for
(
akantu
::
UInt
i
=
0
;
i
<
nb_element
;
++
i
)
{
if
(
max_stress
<
stress
[
i
*
spatial_dimension
*
spatial_dimension
])
{
max_stress
=
stress
[
i
*
spatial_dimension
*
spatial_dimension
];
}
}
akantu
::
Real
*
coord
=
model
.
getFEEngine
().
getMesh
().
getNodes
().
storage
();
akantu
::
Real
*
disp_val
=
model
.
getDisplacement
().
storage
();
akantu
::
UInt
*
conn
=
model
.
getFEEngine
().
getMesh
().
getConnectivity
(
type
).
storage
();
akantu
::
UInt
nb_nodes_per_element
=
model
.
getFEEngine
().
getMesh
().
getNbNodesPerElement
(
type
);
akantu
::
Real
*
coords
=
new
akantu
::
Real
[
spatial_dimension
];
akantu
::
Real
min_x
=
std
::
numeric_limits
<
akantu
::
Real
>::
max
();
akantu
::
Real
max_x
=
std
::
numeric_limits
<
akantu
::
Real
>::
min
();
akantu
::
Real
stress_range
=
5e7
;
for
(
akantu
::
UInt
el
=
0
;
el
<
nb_element
;
++
el
)
{
if
(
stress
[
el
*
spatial_dimension
*
spatial_dimension
]
>
max_stress
-
stress_range
)
{
akantu
::
UInt
el_offset
=
el
*
nb_nodes_per_element
;
memset
(
coords
,
0
,
spatial_dimension
*
sizeof
(
akantu
::
Real
));
for
(
akantu
::
UInt
n
=
0
;
n
<
nb_nodes_per_element
;
++
n
)
{
for
(
akantu
::
UInt
i
=
0
;
i
<
spatial_dimension
;
++
i
)
{
akantu
::
UInt
node
=
conn
[
el_offset
+
n
]
*
spatial_dimension
;
coords
[
i
]
+=
(
coord
[
node
+
i
]
+
disp_val
[
node
+
i
])
/
((
akantu
::
Real
)
nb_nodes_per_element
);
}
}
min_x
=
min_x
<
coords
[
0
]
?
min_x
:
coords
[
0
];
max_x
=
max_x
>
coords
[
0
]
?
max_x
:
coords
[
0
];
}
}
outfile
<<
s
<<
" "
<<
.5
*
(
min_x
+
max_x
)
<<
" "
<<
min_x
<<
" "
<<
max_x
<<
" "
<<
max_x
-
min_x
<<
" "
<<
max_stress
<<
std
::
endl
;
delete
[]
coords
;
#endif
// CHECK_STRESS
#ifdef AKANTU_USE_IOHELPER
if
(
s
%
100
==
0
)
{
model
.
dump
();
model
.
dumpGroup
();
}
#endif
//AKANTU_USE_IOHELPER
if
(
s
%
100
==
0
)
std
::
cout
<<
"passing step "
<<
s
<<
"/"
<<
max_steps
<<
std
::
endl
;
}
energy
.
close
();
#ifdef CHECK_STRESS
outfile
.
close
();
#endif
// CHECK_STRESS
akantu
::
finalize
();
return
EXIT_SUCCESS
;
}
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