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fix_nve_noforce.cpp
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Wed, Sep 4, 04:46
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2 KB
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text/x-c
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Fri, Sep 6, 04:46 (2 d)
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rLAMMPS lammps
fix_nve_noforce.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.
------------------------------------------------------------------------- */
#include <stdio.h>
#include <string.h>
#include "fix_nve_noforce.h"
#include "atom.h"
#include "update.h"
#include "respa.h"
#include "error.h"
using
namespace
LAMMPS_NS
;
using
namespace
FixConst
;
/* ---------------------------------------------------------------------- */
FixNVENoforce
::
FixNVENoforce
(
LAMMPS
*
lmp
,
int
narg
,
char
**
arg
)
:
Fix
(
lmp
,
narg
,
arg
)
{
if
(
narg
!=
3
)
error
->
all
(
FLERR
,
"Illegal fix nve/noforce command"
);
time_integrate
=
1
;
}
/* ---------------------------------------------------------------------- */
int
FixNVENoforce
::
setmask
()
{
int
mask
=
0
;
mask
|=
INITIAL_INTEGRATE
;
mask
|=
INITIAL_INTEGRATE_RESPA
;
return
mask
;
}
/* ---------------------------------------------------------------------- */
void
FixNVENoforce
::
init
()
{
dtv
=
update
->
dt
;
if
(
strstr
(
update
->
integrate_style
,
"respa"
))
step_respa
=
((
Respa
*
)
update
->
integrate
)
->
step
;
}
/* ---------------------------------------------------------------------- */
void
FixNVENoforce
::
initial_integrate
(
int
vflag
)
{
double
**
x
=
atom
->
x
;
double
**
v
=
atom
->
v
;
int
*
mask
=
atom
->
mask
;
int
nlocal
=
atom
->
nlocal
;
if
(
igroup
==
atom
->
firstgroup
)
nlocal
=
atom
->
nfirst
;
for
(
int
i
=
0
;
i
<
nlocal
;
i
++
)
{
if
(
mask
[
i
]
&
groupbit
)
{
x
[
i
][
0
]
+=
dtv
*
v
[
i
][
0
];
x
[
i
][
1
]
+=
dtv
*
v
[
i
][
1
];
x
[
i
][
2
]
+=
dtv
*
v
[
i
][
2
];
}
}
}
/* ---------------------------------------------------------------------- */
void
FixNVENoforce
::
initial_integrate_respa
(
int
vflag
,
int
ilevel
,
int
flag
)
{
if
(
flag
)
return
;
// only used by NPT,NPH
dtv
=
step_respa
[
ilevel
];
if
(
ilevel
==
0
)
initial_integrate
(
vflag
);
}
/* ---------------------------------------------------------------------- */
void
FixNVENoforce
::
reset_dt
()
{
dtv
=
update
->
dt
;
}
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