LAMMPS (22 June 2007)
# Big colloid particles and small LJ particles

units		lj
atom_style	atomic
dimension	2

lattice		sq 0.01
Lattice spacing in x,y,z = 10 10 10
region		box block 0 30 0 30 -0.5 0.5
create_box	2 box
Created orthogonal box = (0 0 -5) to (300 300 5)
  1 by 1 by 1 processor grid
create_atoms	1 box
Created 900 atoms

set		group all type/fraction 2 0.96 23984
  868 settings made for type/fraction

mass		1 9
mass		2 1

velocity	all create 1.44 87287 loop geom

# multi neighbor and comm for efficiency

neighbor	1 multi
neigh_modify	delay 0
communicate	multi

# colloid potential

pair_style	colloid 12.5
pair_coeff	1 1  1.0 1.0 5.0 5.0 12.5
pair_coeff	1 2  5.0 1.0 5.0 0.0 7.0
pair_coeff	2 2 10.0 1.0 0.0 0.0 2.5

fix		1 all npt 2.0 2.0 1.0 xyz 0.0 1.0 10.0 drag 1.0
fix		2 all enforce2d

dump		1 all atom 200 dump.colloid

thermo_style	custom step temp epair etotal press vol
thermo		1000

timestep	0.005

run		10000
Memory usage per processor = 1.47629 Mbytes
Step Temp E_pair TotEng Press Volume 
       0         1.44            0       1.4376    0.0009584       900000 
    1000    1.8470142 0.0048357172    1.8487715  0.017163086    74830.331 
    2000    1.9719939   0.18486401    2.1535713   0.79205271    4710.4215 
    3000    1.8760117   0.16888745    2.0417724    1.2866805    3349.4362 
    4000    2.0084889   0.10591744    2.1110589   0.41080478     6315.195 
    5000    2.0845189  0.074837406    2.1558821   0.32123703    7787.3569 
    6000    2.0635646   0.12699208    2.1871174   0.55212245    5811.0643 
    7000    2.0511741   0.13194486    2.1797003   0.75534937    4447.7483 
    8000    2.0057569   0.14524464    2.1476586   0.93321505     4260.455 
    9000    1.9863917   0.16294985    2.1460309   0.85687596    4264.0791 
   10000    1.9867944   0.17403524    2.1575183     1.019418    3985.5163 
Loop time of 13.1171 on 1 procs for 10000 steps with 900 atoms

Pair  time (%) = 8.49344 (64.7507)
Neigh time (%) = 1.7079 (13.0204)
Comm  time (%) = 0.409296 (3.12032)
Outpt time (%) = 0.224203 (1.70924)
Other time (%) = 2.28229 (17.3993)

Nlocal:    900 ave 900 max 900 min
Histogram: 1 0 0 0 0 0 0 0 0 0
Nghost:    648 ave 648 max 648 min
Histogram: 1 0 0 0 0 0 0 0 0 0
Neighs:    9057 ave 9057 max 9057 min
Histogram: 1 0 0 0 0 0 0 0 0 0

Total # of neighbors = 9057
Ave neighs/atom = 10.0633
Neighbor list builds = 777
Dangerous builds = 0