lammps/examples/KAPPA/in.mp

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# sample LAMMPS input script for thermal conductivity of liquid LJ
# Muller-Plathe method via fix thermal_conductivity
# settings
variable x equal 10
variable y equal 10
variable z equal 20
variable rho equal 0.6
variable t equal 1.35
variable rc equal 2.5
#variable rho equal 0.85
#variable t equal 0.7
#variable rc equal 3.0
# setup problem
units lj
atom_style atomic
lattice fcc ${rho}
region box block 0 $x 0 $y 0 $z
create_box 1 box
create_atoms 1 box
mass 1 1.0
velocity all create $t 87287
pair_style lj/cut ${rc}
pair_coeff 1 1 1.0 1.0
neighbor 0.3 bin
neigh_modify delay 0 every 1
# 1st equilibration run
fix 1 all nvt temp $t $t 0.5
thermo 100
run 1000
velocity all scale $t
unfix 1
# 2nd equilibration run
compute ke all ke/atom
variable temp atom c_ke/1.5
fix 1 all nve
compute layers all chunk/atom bin/1d z lower 0.05 units reduced
fix 2 all ave/chunk 10 100 1000 layers v_temp file profile.mp
fix 3 all thermal/conductivity 10 z 20
variable tdiff equal f_2[11][3]-f_2[1][3]
thermo_style custom step temp epair etotal f_3 v_tdiff
thermo 1000
run 20000
# thermal conductivity calculation
# reset fix thermal/conductivity to zero energy accumulation
fix 3 all thermal/conductivity 10 z 20
fix ave all ave/time 1 1 1000 v_tdiff ave running
thermo_style custom step temp epair etotal f_3 v_tdiff f_ave
run 20000