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SWIFT
SWIFTsim
Commits
4338674e
Commit
4338674e
authored
Oct 26, 2015
by
Matthieu Schaller
Browse files
Moved the functions that dump kernels for cross-check to a new file src/kernel.c
parent
1a80c165
Changes
1
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Inline
Side-by-side
src/kernel.c
0 → 100644
View file @
4338674e
/*******************************************************************************
* This file is part of SWIFT.
* Copyright (c) 2015 Pedro Gonnet (pedro.gonnet@durham.ac.uk),
* Matthieu Schaller (matthieu.schaller@durham.ac.uk)
*
* This program 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.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
#include
<math.h>
#include
<stdio.h>
#include
"kernel.h"
/**
* @brief Test the SPH kernel function by dumping it in the interval [0,1].
*
* @param N number of intervals in [0,1].
*/
void
kernel_dump
(
int
N
)
{
int
k
;
float
x
,
w
,
dw_dx
;
float
x4
[
4
]
=
{
0
.
0
f
,
0
.
0
f
,
0
.
0
f
,
0
.
0
f
};
float
w4
[
4
]
=
{
0
.
0
f
,
0
.
0
f
,
0
.
0
f
,
0
.
0
f
};
// float dw_dx4[4] __attribute__ ((aligned (16)));
for
(
k
=
0
;
k
<=
N
;
k
++
)
{
x
=
((
float
)
k
)
/
N
;
x4
[
3
]
=
x4
[
2
];
x4
[
2
]
=
x4
[
1
];
x4
[
1
]
=
x4
[
0
];
x4
[
0
]
=
x
;
kernel_deval
(
x
,
&
w
,
&
dw_dx
);
// kernel_deval_vec( (vector *)x4 , (vector *)w4 , (vector *)dw_dx4 );
printf
(
" %e %e %e %e %e %e %e
\n
"
,
x
,
w
,
dw_dx
,
w4
[
0
],
w4
[
1
],
w4
[
2
],
w4
[
3
]);
}
}
/**
* @brief The Gadget-2 gravity kernel function
*
* @param r The distance between particles
*/
float
gadget
(
float
r
)
{
float
fac
,
h_inv
,
u
,
r2
=
r
*
r
;
if
(
r
>=
const_epsilon
)
fac
=
1
.
0
f
/
(
r2
*
r
);
else
{
h_inv
=
1
.
/
const_epsilon
;
u
=
r
*
h_inv
;
if
(
u
<
0
.
5
)
fac
=
const_iepsilon3
*
(
10
.
666666666667
+
u
*
u
*
(
32
.
0
*
u
-
38
.
4
));
else
fac
=
const_iepsilon3
*
(
21
.
333333333333
-
48
.
0
*
u
+
38
.
4
*
u
*
u
-
10
.
666666666667
*
u
*
u
*
u
-
0
.
066666666667
/
(
u
*
u
*
u
));
}
return
const_G
*
fac
;
}
/**
* @brief Test the gravity kernel function by dumping it in the interval [0,1].
*
* @param r_max The radius up to which the kernel is dumped.
* @param N number of intervals in [0,1].
*/
void
gravity_dump
(
float
r_max
,
int
N
)
{
int
k
;
float
x
,
w
;
float
x4
[
4
]
=
{
0
.
0
f
,
0
.
0
f
,
0
.
0
f
,
0
.
0
f
};
float
w4
[
4
]
=
{
0
.
0
f
,
0
.
0
f
,
0
.
0
f
,
0
.
0
f
};
// float dw_dx4[4] __attribute__ ((aligned (16)));
for
(
k
=
1
;
k
<=
N
;
k
++
)
{
x
=
(
r_max
*
k
)
/
N
;
x4
[
3
]
=
x4
[
2
];
x4
[
2
]
=
x4
[
1
];
x4
[
1
]
=
x4
[
0
];
x4
[
0
]
=
x
;
kernel_grav_eval
(
x
,
&
w
);
w
*=
const_G
/
(
x
*
x
*
x
);
// blender_deval_vec( (vector *)x4 , (vector *)w4 , (vector *)dw_dx4 );
printf
(
" %.16e %.16e %.16e %.16e %.16e %.16e %.16e
\n
"
,
x
,
w
*
x
,
w4
[
0
],
w4
[
1
],
w4
[
2
],
w4
[
3
],
gadget
(
x
)
*
x
);
}
}
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