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fix_meso_stationary.cpp
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Sun, Jun 9, 21:16
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Tue, Jun 11, 21:16 (1 d, 23 h)
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rLAMMPS lammps
fix_meso_stationary.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_meso_stationary.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "atom.h"
#include "comm.h"
#include "force.h"
#include "neighbor.h"
#include "neigh_list.h"
#include "neigh_request.h"
#include "update.h"
#include "integrate.h"
#include "respa.h"
#include "memory.h"
#include "error.h"
#include "pair.h"
using
namespace
LAMMPS_NS
;
using
namespace
FixConst
;
/* ---------------------------------------------------------------------- */
FixMesoStationary
::
FixMesoStationary
(
LAMMPS
*
lmp
,
int
narg
,
char
**
arg
)
:
Fix
(
lmp
,
narg
,
arg
)
{
if
((
atom
->
e_flag
!=
1
)
||
(
atom
->
rho_flag
!=
1
))
error
->
all
(
FLERR
,
"fix meso/stationary command requires atom_style with both energy and density, e.g. meso"
);
if
(
narg
!=
3
)
error
->
all
(
FLERR
,
"Illegal number of arguments for fix meso/stationary command"
);
time_integrate
=
0
;
}
/* ---------------------------------------------------------------------- */
int
FixMesoStationary
::
setmask
()
{
int
mask
=
0
;
mask
|=
INITIAL_INTEGRATE
;
mask
|=
FINAL_INTEGRATE
;
return
mask
;
}
/* ---------------------------------------------------------------------- */
void
FixMesoStationary
::
init
()
{
dtv
=
update
->
dt
;
dtf
=
0.5
*
update
->
dt
*
force
->
ftm2v
;
}
/* ----------------------------------------------------------------------
allow for both per-type and per-atom mass
------------------------------------------------------------------------- */
void
FixMesoStationary
::
initial_integrate
(
int
vflag
)
{
double
*
rho
=
atom
->
rho
;
double
*
drho
=
atom
->
drho
;
double
*
e
=
atom
->
e
;
double
*
de
=
atom
->
de
;
int
*
mask
=
atom
->
mask
;
int
nlocal
=
atom
->
nlocal
;
int
i
;
if
(
igroup
==
atom
->
firstgroup
)
nlocal
=
atom
->
nfirst
;
for
(
i
=
0
;
i
<
nlocal
;
i
++
)
{
if
(
mask
[
i
]
&
groupbit
)
{
e
[
i
]
+=
dtf
*
de
[
i
];
// half-step update of particle internal energy
rho
[
i
]
+=
dtf
*
drho
[
i
];
// ... and density
}
}
}
/* ---------------------------------------------------------------------- */
void
FixMesoStationary
::
final_integrate
()
{
double
*
e
=
atom
->
e
;
double
*
de
=
atom
->
de
;
double
*
rho
=
atom
->
rho
;
double
*
drho
=
atom
->
drho
;
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
)
{
e
[
i
]
+=
dtf
*
de
[
i
];
rho
[
i
]
+=
dtf
*
drho
[
i
];
}
}
}
/* ---------------------------------------------------------------------- */
void
FixMesoStationary
::
reset_dt
()
{
dtv
=
update
->
dt
;
dtf
=
0.5
*
update
->
dt
*
force
->
ftm2v
;
}
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