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units metal
dimension 3
boundary p f p
atom_style atomic
neighbor 2.0 bin
# create geometry
lattice sc 10
region box block 0 10 0 10 0 10
create_box 1 box
create_atoms 1 box
mass 1 39.95
# LJ potentials
pair_style lj/cut 8.5
pair_coeff * * 0.01 3.4 8.5
# initial velocities
velocity all create 300 482748
fix 1 all nve
# diffusive reflection
# upper wall velocity = 0.1, lower wall fixed
fix ywalls all wall/reflect/stochastic diffusive 2308 &
ylo EDGE 300 0 0 0 yhi EDGE 300 0.1 0 0
# run
thermo 1000
run 10000
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