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F80965292
compute_erotate_sphere_atom.cpp
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Created
Tue, Sep 3, 12:26
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3 KB
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text/x-c
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Thu, Sep 5, 12:26 (2 d)
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blob
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20480650
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rLAMMPS lammps
compute_erotate_sphere_atom.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 <string.h>
#include "compute_erotate_sphere_atom.h"
#include "atom.h"
#include "update.h"
#include "modify.h"
#include "comm.h"
#include "force.h"
#include "memory.h"
#include "error.h"
using
namespace
LAMMPS_NS
;
#define INERTIA 0.4
// moment of inertia prefactor for sphere
/* ---------------------------------------------------------------------- */
ComputeErotateSphereAtom
::
ComputeErotateSphereAtom
(
LAMMPS
*
lmp
,
int
narg
,
char
**
arg
)
:
Compute
(
lmp
,
narg
,
arg
),
erot
(
NULL
)
{
if
(
narg
!=
3
)
error
->
all
(
FLERR
,
"Illegal compute erotate/sphere//atom command"
);
peratom_flag
=
1
;
size_peratom_cols
=
0
;
// error check
if
(
!
atom
->
sphere_flag
)
error
->
all
(
FLERR
,
"Compute erotate/sphere/atom requires atom style sphere"
);
nmax
=
0
;
}
/* ---------------------------------------------------------------------- */
ComputeErotateSphereAtom
::~
ComputeErotateSphereAtom
()
{
memory
->
destroy
(
erot
);
}
/* ---------------------------------------------------------------------- */
void
ComputeErotateSphereAtom
::
init
()
{
int
count
=
0
;
for
(
int
i
=
0
;
i
<
modify
->
ncompute
;
i
++
)
if
(
strcmp
(
modify
->
compute
[
i
]
->
style
,
"erotate/sphere/atom"
)
==
0
)
count
++
;
if
(
count
>
1
&&
comm
->
me
==
0
)
error
->
warning
(
FLERR
,
"More than one compute erotate/sphere/atom"
);
pfactor
=
0.5
*
force
->
mvv2e
*
INERTIA
;
}
/* ---------------------------------------------------------------------- */
void
ComputeErotateSphereAtom
::
compute_peratom
()
{
invoked_peratom
=
update
->
ntimestep
;
// grow erot array if necessary
if
(
atom
->
nmax
>
nmax
)
{
memory
->
destroy
(
erot
);
nmax
=
atom
->
nmax
;
memory
->
create
(
erot
,
nmax
,
"erotate/sphere/atom:erot"
);
vector_atom
=
erot
;
}
// compute rotational kinetic energy for each atom in group
// point particles will have erot = 0.0, due to radius = 0.0
double
**
omega
=
atom
->
omega
;
double
*
radius
=
atom
->
radius
;
double
*
rmass
=
atom
->
rmass
;
int
*
mask
=
atom
->
mask
;
int
nlocal
=
atom
->
nlocal
;
for
(
int
i
=
0
;
i
<
nlocal
;
i
++
)
{
if
(
mask
[
i
]
&
groupbit
)
{
erot
[
i
]
=
(
omega
[
i
][
0
]
*
omega
[
i
][
0
]
+
omega
[
i
][
1
]
*
omega
[
i
][
1
]
+
omega
[
i
][
2
]
*
omega
[
i
][
2
])
*
radius
[
i
]
*
radius
[
i
]
*
rmass
[
i
];
erot
[
i
]
*=
pfactor
;
}
else
erot
[
i
]
=
0.0
;
}
}
/* ----------------------------------------------------------------------
memory usage of local atom-based array
------------------------------------------------------------------------- */
double
ComputeErotateSphereAtom
::
memory_usage
()
{
double
bytes
=
nmax
*
sizeof
(
double
);
return
bytes
;
}
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