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simulation.cc
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Created
Wed, May 1, 19:45
Size
2 KB
Mime Type
text/x-c
Expires
Fri, May 3, 19:45 (2 d)
Engine
blob
Format
Raw Data
Handle
17393030
Attached To
R7871 phys-743-exercises
simulation.cc
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/* -------------------------------------------------------------------------- */
#include "simulation.hh"
/* -------------------------------------------------------------------------- */
#include <cmath>
#include <iostream>
/* -------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------- */
Simulation
::
Simulation
(
int
m
,
int
n
)
:
m_global_m
(
m
),
m_global_n
(
n
),
m_epsilon
(
1e-7
),
m_h_m
(
1.
/
m
),
m_h_n
(
1.
/
n
),
m_grids
(
m
,
n
),
m_f
(
m
,
n
),
m_dumper
(
new
DumperASCII
(
m_grids
.
old
()))
{}
/* -------------------------------------------------------------------------- */
void
Simulation
::
set_initial_conditions
()
{
for
(
int
i
=
0
;
i
<
m_global_m
;
i
++
)
{
for
(
int
j
=
0
;
j
<
m_global_n
;
j
++
)
{
m_f
(
i
,
j
)
=
-
2.
*
100.
*
M_PI
*
M_PI
*
std
::
sin
(
10.
*
M_PI
*
i
*
m_h_m
)
*
std
::
sin
(
10.
*
M_PI
*
j
*
m_h_n
);
}
}
}
/* -------------------------------------------------------------------------- */
std
::
tuple
<
float
,
int
>
Simulation
::
compute
()
{
int
s
=
0
;
float
l2
=
0
;
do
{
l2
=
compute_step
();
m_grids
.
swap
();
m_dumper
->
dump
(
s
);
++
s
;
}
while
(
l2
>
m_epsilon
);
return
std
::
make_tuple
(
std
::
sqrt
(
l2
),
s
);
}
/* -------------------------------------------------------------------------- */
void
Simulation
::
set_epsilon
(
float
epsilon
)
{
m_epsilon
=
epsilon
*
epsilon
;
}
/* -------------------------------------------------------------------------- */
float
Simulation
::
epsilon
()
const
{
return
std
::
sqrt
(
m_epsilon
);
}
/* -------------------------------------------------------------------------- */
float
Simulation
::
compute_step
()
{
float
l2
=
0.
;
Grid
&
u
=
m_grids
.
current
();
Grid
&
uo
=
m_grids
.
old
();
for
(
int
i
=
1
;
i
<
m_global_m
-
1
;
i
++
)
{
for
(
int
j
=
1
;
j
<
m_global_m
-
1
;
j
++
)
{
// computation of the new step
u
(
i
,
j
)
=
0.25
*
(
uo
(
i
-
1
,
j
)
+
uo
(
i
+
1
,
j
)
+
uo
(
i
,
j
-
1
)
+
uo
(
i
,
j
+
1
)
-
m_f
(
i
,
j
)
*
m_h_m
*
m_h_n
);
// L2 norm
l2
+=
(
uo
(
i
,
j
)
-
u
(
i
,
j
))
*
(
uo
(
i
,
j
)
-
u
(
i
,
j
));
}
}
return
l2
;
}
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