lammps/examples/body/in.squares

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# 2d rounded polygon bodies
variable r index 4
variable steps index 100000
variable T index 0.5
variable P index 0.1
variable seed index 980411
units lj
dimension 2
atom_style body rounded/polygon 1 6
atom_modify map array
read_data data.squares
replicate $r $r 1
velocity all create $T ${seed} dist gaussian mom yes rot yes
variable cut_inner equal 0.5
variable k_n equal 100
variable k_na equal 2
variable c_n equal 1
variable c_t equal 1
variable mu equal 0.1
variable delta_ua equal 0.5
pair_style body/rounded/polygon ${c_n} ${c_t} ${mu} ${delta_ua} ${cut_inner}
pair_coeff * * ${k_n} ${k_na}
comm_modify vel yes
neighbor 0.5 bin
neigh_modify every 1 delay 0 check yes
timestep 0.001
#fix 1 all nve/body
#fix 1 all nvt/body temp $T $T 1.0
fix 1 all npt/body temp $T $T 1.0 x 0.001 $P 1.0 &
y 0.001 $P 1.0 couple xy fixedpoint 0 0 0
fix 2 all enforce2d
#compute 1 all body/local id 1 2 3
#dump 1 all local 100000 dump.polygon.* index c_1[1] c_1[2] c_1[3] c_1[4]
thermo_style custom step ke pe etotal press
thermo 1000
#dump 2 all image 10000 image.*.jpg type type zoom 2.0 &
# adiam 1.5 body type 0 0
#dump_modify 2 pad 6
run ${steps}