1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
:link(lws,http://lammps.sandia.gov)
:link(ld,Manual.html)
:link(lc,Section_commands.html#comm)
:line
angle_style class2 command :h3
angle_style class2/omp command :h3
[Syntax:]
angle_style class2 :pre
[Examples:]
angle_style class2
angle_coeff * 75.0
angle_coeff 1 bb 10.5872 1.0119 1.5228
angle_coeff * ba 3.6551 24.895 1.0119 1.5228 :pre
[Description:]
The {class2} angle style uses the potential
:c,image(Eqs/angle_class2.jpg)
where Ea is the angle term, Ebb is a bond-bond term, and Eba is a
bond-angle term. Theta0 is the equilibrium angle and r1 and r2 are
the equilibrium bond lengths.
See "(Sun)"_#Sun for a description of the COMPASS class2 force field.
Coefficients for the Ea, Ebb, and Eba formulas must be defined for
each angle type via the "bond_coeff"_bond_coeff.html command as in the
example above, or in the data file or restart files read by the
"read_data"_read_data.html or "read_restart"_read_restart.html
commands.
These are the 4 coefficients for the Ea formula:
theta0 (degrees)
K2 (energy/radian^2)
K3 (energy/radian^3)
K4 (energy/radian^4) :ul
Theta0 is specified in degrees, but LAMMPS converts it to radians
internally; hence the units of the various K are in per-radian.
For the Ebb formula, each line in a "bond_coeff"_bond_coeff.html
command in the input script lists 4 coefficients, the first of which
is "bb" to indicate they are BondBond coefficients. In a data file,
these coefficients should be listed under a "BondBond Coeffs" heading
and you must leave out the "bb", i.e. only list 3 coefficients after
the angle type.
bb
M (energy/distance^2)
r1 (distance)
r2 (distance) :ul
For the Eba formula, each line in a "bond_coeff"_bond_coeff.html
command in the input script lists 5 coefficients, the first of which
is "ba" to indicate they are BondAngle coefficients. In a data file,
these coefficients should be listed under a "BondAngle Coeffs" heading
and you must leave out the "ba", i.e. only list 4 coefficients after
the angle type.
ba
N1 (energy/distance^2)
N2 (energy/distance^2)
r1 (distance)
r2 (distance) :ul
The theta0 value in the Eba formula is not specified, since it is the
same value from the Ea formula.
:line
Styles with a {cuda}, {gpu}, {omp}, or {opt} suffix are functionally
the same as the corresponding style without the suffix. They have
been optimized to run faster, depending on your available hardware, as
discussed in "Section_accelerate"_Section_accelerate.html of the
manual. The accelerated styles take the same arguments and should
produce the same results, except for round-off and precision issues.
These accelerated styles are part of the USER-CUDA, GPU, USER-OMP and OPT
packages, respectively. They are only enabled if LAMMPS was built with
those packages. See the "Making LAMMPS"_Section_start.html#start_3
section for more info.
You can specify the accelerated styles explicitly in your input script
by including their suffix, or you can use the "-suffix command-line
switch"_Section_start.html#start_7 when you invoke LAMMPS, or you can
use the "suffix"_suffix.html command in your input script.
See "Section_accelerate"_Section_accelerate.html of the manual for
more instructions on how to use the accelerated styles effectively.
:line
[Restrictions:]
This angle style can only be used if LAMMPS was built with the CLASS2
package. See the "Making LAMMPS"_Section_start.html#start_3 section
for more info on packages.
[Related commands:]
"angle_coeff"_angle_coeff.html
[Default:] none
:line
:link(Sun)
[(Sun)] Sun, J Phys Chem B 102, 7338-7364 (1998).
|
