in.colloid

# Big colloid particles and small LJ particles

units lj

atom_style sphere

dimension 2

lattice sq 0.01

region box block 0 30 0 30 -0.5 0.5

create_box 2 box

create_atoms 1 box

set group all type/fraction 2 0.96 23984

set type 1 mass 9

set type 2 mass 1

velocity all create 1.44 87287 loop geom

# multi neighbor and comm for efficiency

neighbor 1 multi

neigh_modify delay 0

comm_modify mode 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 temp 2.0 2.0 1.0 iso 0.0 1.0 10.0 drag 1.0 &

mtk no pchain 0 tchain 1

fix 2 all enforce2d

#dump 1 all atom 1000 dump.colloid

#dump 2 all image 1000 image.*.jpg type type &

# zoom 1.5 center d 0.5 0.5 0.5

#dump_modify 2 pad 5 adiam 1 5.0 adiam 2 1.5

#dump 3 all movie 1000 movie.mpg type type &

# zoom 1.5 center d 0.5 0.5 0.5

#dump_modify 3 pad 5 adiam 1 5.0 adiam 2 1.5

thermo_style custom step temp epair etotal press vol

thermo 1000

timestep 0.005

run 50000