# Big colloid particles and small LJ particles

units           lj
atom_style      sphere
dimension       2

lattice         sq 0.1
region          box block 0 60 0 60 -0.5 0.5
create_box      5 box
create_atoms 1 box

#Roughly equally partition atoms between types 1-4
set             group all type/fraction 2 0.500 23984
set             group all type/fraction 3 0.333 43684
set             group all type/fraction 4 0.250 87811

# remove two spheres of small particles and add large particles in the voids
region sphere1 sphere 60.0 60.0 0.0 30.0 units box
region sphere2 sphere 130.0 130.0 0.0 30.0 units box
delete_atoms  region sphere1
delete_atoms  region sphere2
create_atoms 5 single 60.0 60.0 0.0 units box
create_atoms 5 single 130.0 130.0 0.0 units box

set             type 1 mass 400
set             type 2 mass 1

velocity        all create 1.44 87287 loop geom

# multi neighbor and comm for efficiency

neighbor        1 multi #multi/old
neigh_modify    delay 0 collection/type 2 1*4 5
comm_modify     mode multi reduce/multi #multi/old

# colloid potential

pair_style      colloid 20.0
pair_coeff      * * 144.0 1.0 0.0 0.0 3.0
pair_coeff      1 5 75.4  1.0 0.0 20.0 14.0
pair_coeff      2 5 75.4  1.0 0.0 20.0 14.0
pair_coeff      3 5 75.4  1.0 0.0 20.0 14.0
pair_coeff      4 5 75.4  1.0 0.0 20.0 14.0
pair_coeff      5 5 39.5  1.0 20.0 20.0 30.0



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          100

timestep        0.005

run             2000