units           lj
atom_style      full
boundary p p p

special_bonds lj/coul 1 1 1
newton on on

# save an extra atom type for bond particles
read_data data.chain

neighbor        2.0 bin
neigh_modify    every 10 check yes

bond_style      harmonic
bond_coeff      * 225.0 0.85

comm_modify vel yes
comm_modify cutoff 3.6

# must use pair hybrid, since srp bond particles
# do not interact with other atoms types
pair_style      hybrid dpd 1.0 1.0 373692 srp 0.8 1 mid
pair_coeff      1 1 dpd 60.0 4.5 1.0 
pair_coeff      1 2 none
pair_coeff      2 2 srp 100.0 

# auto normalization of thermo quantities is turned off by pair srp
# just divide by natoms 
variable        natoms equal count(all)
variable        nPotEng equal c_thermo_pe/v_natoms 

thermo 50
thermo_style custom step temp pe v_nPotEng press atoms v_natoms lx ly lz

fix  1 all nve
timestep        0.01

restart 500	mid-run-*.restart

run          1000

write_restart   end-run.restart