# 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 ${neigh_skin} bin neighbor 2 bin # create a supercell with cubic lattice (fcc, bcc, sc, or diamond) # using 10*10*10 conventional (orthogonal) unit cells variable latticeconst_converted equal 3.167413122951984*${_u_distance} variable latticeconst_converted equal 3.167413122951984*1 lattice bcc ${latticeconst_converted} lattice bcc 3.16741312295198 Lattice spacing in x,y,z = 3.1674131 3.1674131 3.1674131 region simbox block 0 10 0 10 0 10 units lattice create_box 1 simbox Created orthogonal box = (0 0 0) to (31.674131 31.674131 31.674131) 1 by 1 by 1 MPI processor grid create_atoms 1 box Created 2000 atoms using lattice units in orthogonal box = (0 0 0) to (31.674131 31.674131 31.674131) create_atoms CPU = 0.001 seconds variable mass_converted equal 95.94*${_u_mass} variable mass_converted equal 95.94*1 kim interactions Mo #=== BEGIN kim interactions ================================== pair_style kim MEAM_LAMMPS_ParkFellingerLenosky_2012_Mo__MO_269937397263_002 pair_coeff * * Mo #=== END kim interactions ==================================== mass 1 ${mass_converted} mass 1 95.94 # initial volume variable v equal vol # assign formula variable V0 equal ${v} # evaluate initial value variable V0 equal 31777.0908166668 variable V0_metal equal ${V0}/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 31777.0908166668/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 31777.0908166668/(1*${_u_distance}*${_u_distance}) variable V0_metal equal 31777.0908166668/(1*1*${_u_distance}) variable V0_metal equal 31777.0908166668/(1*1*1) variable V0_metal_times1000 equal ${V0_metal}*1000 variable V0_metal_times1000 equal 31777.0908166668*1000 print "Initial system volume: ${V0_metal} Angstroms^3" Initial system volume: 31777.0908166668 Angstroms^3 # set the time step to 0.001 picoseconds variable timestep_converted equal 0.001*${_u_time} variable timestep_converted equal 0.001*1 timestep ${timestep_converted} timestep 0.001 variable temp_converted equal 293.15*${_u_temperature} variable temp_converted equal 293.15*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 293.15 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 293.15 ${temp_converted} ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 293.15 293.15 ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 293.15 293.15 0.01 iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 293.15 293.15 0.01 iso 0 ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 293.15 293.15 0.01 iso 0 0 ${Pdamp_converted} fix ensemble all npt temp 293.15 293.15 0.01 iso 0 0 0.1 # compute the time averages of pressure, temperature, and volume, respectively # ignore the first 5000 timesteps variable etotal_metal equal etotal/${_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 "293.15 - 1.0" variable T_up equal "293.15 + 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_269937397263_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 = 7.9 ghost atom cutoff = 7.9 binsize = 3.95, bins = 9 9 9 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) = 4.134 | 4.134 | 4.134 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 0 -13559.008 -13559.008 -13634.755 -13634.755 293.15 293.15 31777.091 31777.091 2546.0514 2546.0514 1000 -13482.127 -13482.127 -13556.598 -13556.598 288.20896 288.20896 31932.519 31932.519 -34.643778 -34.643778 Loop time of 83.9035 on 1 procs for 1000 steps with 2000 atoms Performance: 1.030 ns/day, 23.307 hours/ns, 11.918 timesteps/s, 23.837 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 | 83.816 | 83.816 | 83.816 | 0.0 | 99.90 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.016082 | 0.016082 | 0.016082 | 0.0 | 0.02 Output | 0.00015233 | 0.00015233 | 0.00015233 | 0.0 | 0.00 Modify | 0.064514 | 0.064514 | 0.064514 | 0.0 | 0.08 Other | | 0.006706 | | | 0.01 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: 272000 ave 272000 max 272000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 272000 Ave neighs/atom = 136 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 = ${P}" flag: Temp = 292.835078821748, Press = -20.3023798994659 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 7.9 ghost atom cutoff = 7.9 binsize = 3.95, bins = 9 9 9 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 4.139 | 4.139 | 4.139 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 1000 -13482.127 -13482.127 -13556.598 -13556.598 288.20896 288.20896 31932.519 31932.519 -34.643778 -34.643778 2000 -13483.183 -13483.183 -13557.166 -13557.166 286.3212 286.3212 31963.736 31963.736 -2852.0352 -2852.0352 Loop time of 84.4434 on 1 procs for 1000 steps with 2000 atoms Performance: 1.023 ns/day, 23.457 hours/ns, 11.842 timesteps/s, 23.684 katom-step/s 100.0% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 84.353 | 84.353 | 84.353 | 0.0 | 99.89 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.017424 | 0.017424 | 0.017424 | 0.0 | 0.02 Output | 0.00025021 | 0.00025021 | 0.00025021 | 0.0 | 0.00 Modify | 0.066351 | 0.066351 | 0.066351 | 0.0 | 0.08 Other | | 0.006541 | | | 0.01 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4495 ave 4495 max 4495 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 269874 ave 269874 max 269874 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 269874 Ave neighs/atom = 134.937 Neighbor list builds = 0 Dangerous builds = 0 if "${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 = ${P}" flag: Temp = 293.329154994877, Press = -8.34221400995791 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 7.9 ghost atom cutoff = 7.9 binsize = 3.95, bins = 9 9 9 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 4.139 | 4.139 | 4.139 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 2000 -13483.183 -13483.183 -13557.166 -13557.166 286.3212 286.3212 31963.736 31963.736 -2852.0352 -2852.0352 3000 -13485.274 -13485.274 -13560.864 -13560.864 292.54141 292.54141 31924.365 31924.365 113.37701 113.37701 Loop time of 81.9887 on 1 procs for 1000 steps with 2000 atoms Performance: 1.054 ns/day, 22.775 hours/ns, 12.197 timesteps/s, 24.394 katom-step/s 100.0% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 81.89 | 81.89 | 81.89 | 0.0 | 99.88 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.018388 | 0.018388 | 0.018388 | 0.0 | 0.02 Output | 0.0003346 | 0.0003346 | 0.0003346 | 0.0 | 0.00 Modify | 0.071755 | 0.071755 | 0.071755 | 0.0 | 0.09 Other | | 0.008436 | | | 0.01 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4458 ave 4458 max 4458 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 269280 ave 269280 max 269280 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 269280 Ave neighs/atom = 134.64 Neighbor list builds = 0 Dangerous builds = 0 if "${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" 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_T293.15.out" else "print 'not_converged' file output/vol_T293.15.out" print '${V}' file output/vol_T293.15.out 31928.6344469983 print "LAMMPS calculation completed" LAMMPS calculation completed quit 0