lammps/examples/mesh/in.marble_race

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units real
lattice sc 5.0
region box block -110 60 -30 220 -90 130 units box
create_box 2 box
region particles cylinder y 0 -30 47 130 190 units box
create_atoms 1 region particles
region lid cylinder y 0 -30 47 190 200 units box
group mobile type 1
create_atoms 2 mesh race_track.stl units box
group mesh type 2
mass * 39.95
pair_style lj/cut 8.76
pair_coeff 1 1 0.2339 3.504
pair_coeff 1 2 0.2339 7.008 $(7.008*2^(1.0/6.0))
pair_coeff 2 2 0.0 1.0
balance 1.1 shift xyz 10 1.01
neigh_modify exclude type 2 2
timestep 1.0
fix track mesh setforce 0.0 0.0 0.0
fix pull mobile addforce 0.0 -0.05 0.0 region particles
fix dir mobile oneway 10 lid -y
fix move mobile nve
fix load all balance 1000 1.1 shift xyz 10 1.01 weight neigh 0.5 weight group 2 mesh 0.1 mobile 1.0
minimize 0.0 0.0 1000 1000
reset_timestep 0 time 0.0
velocity mobile create 150.0 54634234
compute ptemp mobile temp
thermo_modify temp ptemp
thermo 1000
# dump 1 all atom 1000 race.lammpstrj
run 10000