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lammps/examples/USER/atc/two_temperature/in.bar1d_ttm
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in.bar1d_ttm
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# in this example the electron temperature on the left is ramped up in time
# and held fixed on the right. the phonon temperature is free on the left
# and fixed and consistent with the electron temperature on the right.
# this mimics some simplified pumped system
# also a volume source is added to mimic Joule heating
#echo both
# units
units real
atom_style atomic
# create domain
#lattice type reduced density rho* = 4*(sigma/a)^3,
# where N = 4 for fcc,
# s = 3.405 A (Wagner)
# a = 5.25 A (Ashcroft & Mermin, p. 70)
#if {restart}
boundary f p p
pair_style lj/cut 13.5
read_data temp.init
#endif
lattice fcc 5.405 origin 0.25 0.25 0.25
region feRegion block -14 14 -3 3 -3 3
region mdRegion block -12 12 -3 3 -3 3
region mdInternal block -10 10 -3 3 -3 3
# NOTE: don't define ghosts if they are outside the feRegion
group internal region mdInternal
group ghost subtract all internal
# create atoms
#if !{restart}
#boundary f p p
#create_box 1 mdRegion
#create_atoms 1 region mdRegion
#mass 1 39.95
#pair_style lj/cut 13.5
#pair_coeff 1 1 .238 3.405 13.5
#velocity internal create 40 87287 mom yes loop geom
#endif
# timestep & neighboring
timestep 5.0
thermo 10
neighbor 5. bin
neigh_modify every 10 delay 0 check no
# ID group atc PhysicsType ParameterFile
fix AtC internal atc two_temperature Ar_ttm.mat
fix_modify AtC boundary ghost
# ID part keywords nx ny nz region
fix_modify AtC mesh create 14 1 1 feRegion f p p
# fix initial temperatures
#if !{restart}
#velocity internal create 40 87287 mom yes loop geom
#endif
fix_modify AtC initial temperature all 20
fix_modify AtC fix temperature all 20
fix_modify AtC initial electron_temperature all 20
fix_modify AtC fix electron_temperature all 20
# equilibrate MD field with rescale
fix_modify AtC extrinsic exchange off
fix_modify AtC control thermal rescale 10
#if !{restart}
#run 1000
#endif
# change thermostat
fix_modify AtC extrinsic exchange on
fix_modify AtC unfix temperature all
fix_modify AtC unfix electron_temperature all
# note does not handle "inf"s
#fix_modify AtC mesh create_faceset bndy -8 8 inf inf inf inf
fix_modify AtC mesh create_faceset bndy box -10 10 -10 10 -10 10
fix_modify AtC control thermal flux faceset bndy
# .. this controls the time filtering ....
#fix_modify AtC filter scale 500.0
# add nodesets & boundary temperature controls
# ID mesh create_nodeset tag xmin xmax ymin ymax zmin zmax
# NOTE create_nodeset doesn't handle "inf"
fix_modify AtC mesh create_nodeset lbc -14.1 -13.9 -INF INF -INF INF
fix_modify AtC mesh create_nodeset rbc 13.9 14.1 -INF INF -INF INF
fix_modify AtC fix electron_temperature lbc 40.
fix_modify AtC fix electron_temperature rbc 20.
fix_modify AtC fix temperature rbc 20.
#fix_modify AtC source electron_temperature all 0.0015
fix_modify AtC source electron_temperature all 9.50445e-11
# output filename frequency [text output]
fix_modify AtC output bar1d_ttmFE 100 text
# run transient to steady state
thermo 10
reset_timestep 0
run 4000
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