# periodic boundary conditions along all three dimensions boundary p p p # Set neighbor skin variable neigh_skin equal 2.0*${_u_distance} variable neigh_skin equal 2.0*1 neighbor ${neigh_skin} bin neighbor 2 bin # create a supercell with cubic lattice (fcc, bcc, sc, or diamond) # using 10*10*10 conventional (orthogonal) unit cells variable latticeconst_converted equal 2.851000025868416*${_u_distance} variable latticeconst_converted equal 2.851000025868416*1 lattice bcc ${latticeconst_converted} lattice bcc 2.85100002586842 Lattice spacing in x,y,z = 2.851 2.851 2.851 region simbox block 0 10 0 10 0 10 units lattice create_box 1 simbox Created orthogonal box = (0 0 0) to (28.51 28.51 28.51) 1 by 1 by 1 MPI processor grid create_atoms 1 box Created 2000 atoms using lattice units in orthogonal box = (0 0 0) to (28.51 28.51 28.51) create_atoms CPU = 0.000 seconds variable mass_converted equal 55.845*${_u_mass} variable mass_converted equal 55.845*1 kim interactions Fe #=== BEGIN kim interactions ================================== pair_style kim MEAM_LAMMPS_EtesamiAsadi_2018_Fe__MO_549900287421_002 pair_coeff * * Fe #=== END kim interactions ==================================== mass 1 ${mass_converted} mass 1 55.845 # initial volume variable v equal vol # assign formula variable V0 equal ${v} # evaluate initial value variable V0 equal 23173.5016817912 variable V0_metal equal ${V0}/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 23173.5016817912/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 23173.5016817912/(1*${_u_distance}*${_u_distance}) variable V0_metal equal 23173.5016817912/(1*1*${_u_distance}) variable V0_metal equal 23173.5016817912/(1*1*1) variable V0_metal_times1000 equal ${V0_metal}*1000 variable V0_metal_times1000 equal 23173.5016817912*1000 print "Initial system volume: ${V0_metal} Angstroms^3" Initial system volume: 23173.5016817912 Angstroms^3 # set the time step to 0.001 picoseconds variable timestep_converted equal 0.001*${_u_time} variable timestep_converted equal 0.001*1 timestep ${timestep_converted} timestep 0.001 variable temp_converted equal 333.15*${_u_temperature} variable temp_converted equal 333.15*1 variable Tdamp_converted equal 0.01*${_u_time} variable Tdamp_converted equal 0.01*1 variable press_converted equal 0.0*${_u_pressure} variable press_converted equal 0.0*1 variable Pdamp_converted equal 0.1*${_u_time} variable Pdamp_converted equal 0.1*1 # create initial velocities consistent with the chosen temperature velocity all create ${temp_converted} 17 mom yes rot yes velocity all create 333.15 17 mom yes rot yes # set NPT ensemble for all atoms fix ensemble all npt temp ${temp_converted} ${temp_converted} ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 333.15 ${temp_converted} ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 333.15 333.15 ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 333.15 333.15 0.01 iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 333.15 333.15 0.01 iso 0 ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 333.15 333.15 0.01 iso 0 0 ${Pdamp_converted} fix ensemble all npt temp 333.15 333.15 0.01 iso 0 0 0.1 # compute the time averages of pressure, temperature, and volume, respectively # ignore the first 5000 timesteps variable etotal_metal equal etotal/${_u_energy} variable etotal_metal equal etotal/1 variable pe_metal equal pe/${_u_energy} variable pe_metal equal pe/1 variable T_metal equal temp/${_u_temperature} variable T_metal equal temp/1 variable V_metal equal vol/(${_u_distance}*${_u_distance}*${_u_distance}) variable V_metal equal vol/(1*${_u_distance}*${_u_distance}) variable V_metal equal vol/(1*1*${_u_distance}) variable V_metal equal vol/(1*1*1) variable P_metal equal press/${_u_pressure} variable P_metal equal press/1 fix avgmyTemp all ave/time 5 20 100 v_T_metal ave running start 1000 fix avgmyPress all ave/time 5 20 100 v_P_metal ave running start 1000 fix avgmyVol all ave/time 5 20 100 v_V_metal ave running start 1000 # extract fix quantities into variables so they can be used in if-else logic later. variable T equal f_avgmyTemp variable P equal f_avgmyPress variable V equal f_avgmyVol # set error bounds for temperature and pressure in original metal units (K and bar) variable T_low equal "333.15 - 1.0" variable T_up equal "333.15 + 1.0" variable P_low equal "0.0 - 5.0" variable P_up equal "0.0 + 5.0" # print to logfile every 1000 timesteps thermo_style custom step etotal v_etotal_metal pe v_pe_metal temp v_T_metal vol v_V_metal press v_P_metal thermo 1000 # Run a simulation for at most 2000*1000 timesteps. At each 1000th time step, check # whether the temperature and pressure have converged. If yes, break. label top variable a loop 2000 run 1000 CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE Your simulation uses code contributions which should be cited: - OpenKIM Project: doi:10.1007/s11837-011-0102-6 @Article{tadmor:elliott:2011, author = {E. B. Tadmor and R. S. Elliott and J. P. Sethna and R. E. Miller and C. A. Becker}, title = {The potential of atomistic simulations and the {K}nowledgebase of {I}nteratomic {M}odels}, journal = {{JOM}}, year = 2011, volume = 63, number = 17, pages = {17}, doi = {10.1007/s11837-011-0102-6} } - OpenKIM potential: https://openkim.org/cite/MO_549900287421_002#item-citation CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 6 ghost atom cutoff = 6 binsize = 3, bins = 10 10 10 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 3.755 | 3.755 | 3.755 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 0 -8493.9169 -8493.9169 -8579.9999 -8579.9999 333.15 333.15 23173.502 23173.502 3967.7587 3967.7587 1000 -8401.3908 -8401.3908 -8484.166 -8484.166 320.34872 320.34872 23445.875 23445.875 -1949.5234 -1949.5234 Loop time of 17.6913 on 1 procs for 1000 steps with 2000 atoms Performance: 4.884 ns/day, 4.914 hours/ns, 56.525 timesteps/s, 113.050 katom-step/s 99.9% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 17.607 | 17.607 | 17.607 | 0.0 | 99.52 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.015584 | 0.015584 | 0.015584 | 0.0 | 0.09 Output | 0.00011357 | 0.00011357 | 0.00011357 | 0.0 | 0.00 Modify | 0.061382 | 0.061382 | 0.061382 | 0.0 | 0.35 Other | | 0.00724 | | | 0.04 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4119 ave 4119 max 4119 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 128000 ave 128000 max 128000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 128000 Ave neighs/atom = 64 Neighbor list builds = 0 Dangerous builds = 0 if "${V_metal}>${V0_metal_times1000}" then "jump SELF unstable" if "${T}>${T_low} && ${T}<${T_up} && ${P}>${P_low} && ${P}<${P_up}" then "jump SELF break" print "flag: Temp = ${T}, Press = ${P}" flag: Temp = 329.458139089133, Press = 75.6442747216689 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 6 ghost atom cutoff = 6 binsize = 3, bins = 10 10 10 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 3.755 | 3.755 | 3.755 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 1000 -8401.3908 -8401.3908 -8484.166 -8484.166 320.34872 320.34872 23445.875 23445.875 -1949.5234 -1949.5234 2000 -8400.7058 -8400.7058 -8484.3772 -8484.3772 323.81719 323.81719 23414.402 23414.402 469.83856 469.83856 Loop time of 19.4335 on 1 procs for 1000 steps with 2000 atoms Performance: 4.446 ns/day, 5.398 hours/ns, 51.458 timesteps/s, 102.915 katom-step/s 100.0% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 19.354 | 19.354 | 19.354 | 0.0 | 99.59 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.014194 | 0.014194 | 0.014194 | 0.0 | 0.07 Output | 4.746e-05 | 4.746e-05 | 4.746e-05 | 0.0 | 0.00 Modify | 0.059678 | 0.059678 | 0.059678 | 0.0 | 0.31 Other | | 0.005336 | | | 0.03 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4118 ave 4118 max 4118 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 128426 ave 128426 max 128426 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 128426 Ave neighs/atom = 64.213 Neighbor list builds = 0 Dangerous builds = 0 if "${V_metal}>${V0_metal_times1000}" then "jump SELF unstable" if "${T}>${T_low} && ${T}<${T_up} && ${P}>${P_low} && ${P}<${P_up}" then "jump SELF break" print "flag: Temp = ${T}, Press = ${P}" flag: Temp = 332.965807197955, Press = 5.96177861640802 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 6 ghost atom cutoff = 6 binsize = 3, bins = 10 10 10 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 3.755 | 3.755 | 3.755 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 2000 -8400.7058 -8400.7058 -8484.3772 -8484.3772 323.81719 323.81719 23414.402 23414.402 469.83856 469.83856 3000 -8402.9161 -8402.9161 -8488.2511 -8488.2511 330.25493 330.25493 23392.08 23392.08 1463.4684 1463.4684 Loop time of 19.6729 on 1 procs for 1000 steps with 2000 atoms Performance: 4.392 ns/day, 5.465 hours/ns, 50.831 timesteps/s, 101.663 katom-step/s 100.0% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 19.594 | 19.594 | 19.594 | 0.0 | 99.60 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.014195 | 0.014195 | 0.014195 | 0.0 | 0.07 Output | 3.2521e-05 | 3.2521e-05 | 3.2521e-05 | 0.0 | 0.00 Modify | 0.059729 | 0.059729 | 0.059729 | 0.0 | 0.30 Other | | 0.005218 | | | 0.03 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4119 ave 4119 max 4119 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 128418 ave 128418 max 128418 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 128418 Ave neighs/atom = 64.209 Neighbor list builds = 0 Dangerous builds = 0 if "${V_metal}>${V0_metal_times1000}" then "jump SELF unstable" if "${T}>${T_low} && ${T}<${T_up} && ${P}>${P_low} && ${P}<${P_up}" then "jump SELF break" print "flag: Temp = ${T}, Press = ${P}" flag: Temp = 332.768479810951, Press = 10.230446970379 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 6 ghost atom cutoff = 6 binsize = 3, bins = 10 10 10 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 3.755 | 3.755 | 3.755 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 3000 -8402.9161 -8402.9161 -8488.2511 -8488.2511 330.25493 330.25493 23392.08 23392.08 1463.4684 1463.4684 4000 -8405.2244 -8405.2244 -8490.4458 -8490.4458 329.81542 329.81542 23464.554 23464.554 -3901.2754 -3901.2754 Loop time of 19.6955 on 1 procs for 1000 steps with 2000 atoms Performance: 4.387 ns/day, 5.471 hours/ns, 50.773 timesteps/s, 101.546 katom-step/s 100.0% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 19.616 | 19.616 | 19.616 | 0.0 | 99.60 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.014307 | 0.014307 | 0.014307 | 0.0 | 0.07 Output | 5.4842e-05 | 5.4842e-05 | 5.4842e-05 | 0.0 | 0.00 Modify | 0.059429 | 0.059429 | 0.059429 | 0.0 | 0.30 Other | | 0.005202 | | | 0.03 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4119 ave 4119 max 4119 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 128366 ave 128366 max 128366 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 128366 Ave neighs/atom = 64.183 Neighbor list builds = 0 Dangerous builds = 0 if "${V_metal}>${V0_metal_times1000}" then "jump SELF unstable" if "${T}>${T_low} && ${T}<${T_up} && ${P}>${P_low} && ${P}<${P_up}" then "jump SELF break" jump SELF break # Write final averaged volume to file if temperature and volume have converged; otherwise wirte a # flag to indicate non-convergence. variable myStep equal step if "${myStep} < 2000000" then "print '${V}' file output/vol_T333.15.out" else "print 'not_converged' file output/vol_T333.15.out" print '${V}' file output/vol_T333.15.out 23412.4395363665 print "LAMMPS calculation completed" LAMMPS calculation completed quit 0