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fix_efield.cpp
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Created
Sun, Jul 28, 20:17
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2 KB
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text/x-c
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Tue, Jul 30, 20:17 (2 d)
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blob
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19416520
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rLAMMPS lammps
fix_efield.cpp
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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
Contributing author: Christina Payne (Vanderbilt U)
------------------------------------------------------------------------- */
#include "string.h"
#include "stdlib.h"
#include "fix_efield.h"
#include "atom.h"
#include "update.h"
#include "force.h"
#include "respa.h"
#include "error.h"
#include "math.h"
using
namespace
LAMMPS_NS
;
/* ---------------------------------------------------------------------- */
FixEfield
::
FixEfield
(
LAMMPS
*
lmp
,
int
narg
,
char
**
arg
)
:
Fix
(
lmp
,
narg
,
arg
)
{
if
(
narg
!=
6
)
error
->
all
(
"Illegal fix efield command"
);
double
factor
=
force
->
qe2f
;
ex
=
factor
*
atof
(
arg
[
3
]);
ey
=
factor
*
atof
(
arg
[
4
]);
ez
=
factor
*
atof
(
arg
[
5
]);
}
/* ---------------------------------------------------------------------- */
int
FixEfield
::
setmask
()
{
int
mask
=
0
;
mask
|=
POST_FORCE
;
mask
|=
POST_FORCE_RESPA
;
return
mask
;
}
/* ---------------------------------------------------------------------- */
void
FixEfield
::
init
()
{
// require an atom style with charge defined
if
(
atom
->
q
==
NULL
)
error
->
all
(
"Must use charged atom style with fix efield"
);
if
(
strcmp
(
update
->
integrate_style
,
"respa"
)
==
0
)
nlevels_respa
=
((
Respa
*
)
update
->
integrate
)
->
nlevels
;
}
/* ---------------------------------------------------------------------- */
void
FixEfield
::
setup
()
{
if
(
strcmp
(
update
->
integrate_style
,
"verlet"
)
==
0
)
post_force
(
1
);
else
{
((
Respa
*
)
update
->
integrate
)
->
copy_flevel_f
(
nlevels_respa
-
1
);
post_force_respa
(
1
,
nlevels_respa
-
1
,
0
);
((
Respa
*
)
update
->
integrate
)
->
copy_f_flevel
(
nlevels_respa
-
1
);
}
}
/* ----------------------------------------------------------------------
apply F = qE
------------------------------------------------------------------------- */
void
FixEfield
::
post_force
(
int
vflag
)
{
double
**
f
=
atom
->
f
;
double
*
q
=
atom
->
q
;
int
*
mask
=
atom
->
mask
;
int
nlocal
=
atom
->
nlocal
;
for
(
int
i
=
0
;
i
<
nlocal
;
i
++
)
if
(
mask
[
i
]
&
groupbit
)
{
f
[
i
][
0
]
+=
q
[
i
]
*
ex
;
f
[
i
][
1
]
+=
q
[
i
]
*
ey
;
f
[
i
][
2
]
+=
q
[
i
]
*
ez
;
}
}
/* ---------------------------------------------------------------------- */
void
FixEfield
::
post_force_respa
(
int
vflag
,
int
ilevel
,
int
iloop
)
{
if
(
ilevel
==
nlevels_respa
-
1
)
post_force
(
vflag
);
}
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