# Example problem demonstrating the use of synchronized_verlet 
# Refer https://doi.org/10.1016/j.cpc.2025.109524 for further details

units	        si
atom_style	sphere
newton off

boundary   	p p f
read_data       3ps.dat 

group           ps type 1
group           fine type 2

pair_style granular
pair_coeff * * hooke 1e4 0.5 tangential linear_history 8235 0 0.5 damping coeff_restitution synchronized_verlet
# pair_coeff * * hertz/material 5e8 0.5 0.3 tangential mindlin  NULL 0.0 0.5 damping coeff_restitution #synchronized_verlet

timestep        1e-6
fix             frz ps freeze 
fix             g fine gravity 9.81 vector 0 0 -1
fix             1 fine nve/sphere
fix             2 all wall/gran granular hooke 1e4 0.5 tangential linear_history 8235 0 0.5 damping coeff_restitution zplane $(zlo) $(zhi)

# dump            1 all custom 3000 op.dump id x y z vx vy vz type diameter 

comm_modify     vel yes

thermo          3000
thermo_style    custom step ke
run_style       verlet
run             300000