# 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 ${neigh_skin} bin neighbor 2 bin # create a supercell with cubic lattice (fcc, bcc, sc, or diamond) # using 10*10*10 conventional (orthogonal) unit cells variable latticeconst_converted equal 2.863645806908607*${_u_distance} variable latticeconst_converted equal 2.863645806908607*1 lattice bcc ${latticeconst_converted} lattice bcc 2.86364580690861 Lattice spacing in x,y,z = 2.8636458 2.8636458 2.8636458 region simbox block 0 10 0 10 0 10 units lattice create_box 1 simbox Created orthogonal box = (0 0 0) to (28.636458 28.636458 28.636458) 1 by 1 by 1 MPI processor grid create_atoms 1 box Created 2000 atoms using lattice units in orthogonal box = (0 0 0) to (28.636458 28.636458 28.636458) create_atoms CPU = 0.000 seconds variable mass_converted equal 55.845*${_u_mass} variable mass_converted equal 55.845*1 kim interactions Fe #=== BEGIN kim interactions ================================== pair_style kim MEAM_LAMMPS_ChoiJoSohn_2018_CoNiCrFeMn__MO_115454747503_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 23483.2338195995 variable V0_metal equal ${V0}/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 23483.2338195995/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 23483.2338195995/(1*${_u_distance}*${_u_distance}) variable V0_metal equal 23483.2338195995/(1*1*${_u_distance}) variable V0_metal equal 23483.2338195995/(1*1*1) variable V0_metal_times1000 equal ${V0_metal}*1000 variable V0_metal_times1000 equal 23483.2338195995*1000 print "Initial system volume: ${V0_metal} Angstroms^3" Initial system volume: 23483.2338195995 Angstroms^3 # set the time step to 0.001 picoseconds variable timestep_converted equal 0.001*${_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_115454747503_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 = 6.5 ghost atom cutoff = 6.5 binsize = 3.25, 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 -8494.3364 -8494.3364 -8580.4194 -8580.4194 333.15 333.15 23483.234 23483.234 3915.3848 3915.3848 1000 -8404.2588 -8404.2588 -8491.1414 -8491.1414 336.24454 336.24454 23762.586 23762.586 -508.23715 -508.23715 Loop time of 60.5646 on 1 procs for 1000 steps with 2000 atoms Performance: 1.427 ns/day, 16.823 hours/ns, 16.511 timesteps/s, 33.023 katom-step/s 99.7% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 60.483 | 60.483 | 60.483 | 0.0 | 99.87 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.015297 | 0.015297 | 0.015297 | 0.0 | 0.03 Output | 8.4058e-05 | 8.4058e-05 | 8.4058e-05 | 0.0 | 0.00 Modify | 0.060742 | 0.060742 | 0.060742 | 0.0 | 0.10 Other | | 0.005607 | | | 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: 224000 ave 224000 max 224000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 224000 Ave neighs/atom = 112 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 = ${P}" flag: Temp = 334.033064414948, Press = -104.060586791697 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 6.5 ghost atom cutoff = 6.5 binsize = 3.25, bins = 9 9 9 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 4.134 | 4.134 | 4.134 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 1000 -8404.2588 -8404.2588 -8491.1414 -8491.1414 336.24454 336.24454 23762.586 23762.586 -508.23715 -508.23715 2000 -8406.1931 -8406.1931 -8493.1331 -8493.1331 336.46667 336.46667 23768.068 23768.068 -1181.6741 -1181.6741 Loop time of 62.8664 on 1 procs for 1000 steps with 2000 atoms Performance: 1.374 ns/day, 17.463 hours/ns, 15.907 timesteps/s, 31.813 katom-step/s 99.7% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 62.773 | 62.773 | 62.773 | 0.0 | 99.85 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.018254 | 0.018254 | 0.018254 | 0.0 | 0.03 Output | 5.1387e-05 | 5.1387e-05 | 5.1387e-05 | 0.0 | 0.00 Modify | 0.065048 | 0.065048 | 0.065048 | 0.0 | 0.10 Other | | 0.01042 | | | 0.02 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4119 ave 4119 max 4119 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 210898 ave 210898 max 210898 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 210898 Ave neighs/atom = 105.449 Neighbor list builds = 0 Dangerous builds = 0 if "${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 = ${P}" flag: Temp = 333.311240491695, Press = -5.7649366720567 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 6.5 ghost atom cutoff = 6.5 binsize = 3.25, bins = 9 9 9 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 4.134 | 4.134 | 4.134 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 2000 -8406.1931 -8406.1931 -8493.1331 -8493.1331 336.46667 336.46667 23768.068 23768.068 -1181.6741 -1181.6741 3000 -8410.7557 -8410.7557 -8496.1838 -8496.1838 330.61582 330.61582 23727.063 23727.063 1239.2595 1239.2595 Loop time of 63.1676 on 1 procs for 1000 steps with 2000 atoms Performance: 1.368 ns/day, 17.547 hours/ns, 15.831 timesteps/s, 31.662 katom-step/s 99.7% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 63.068 | 63.068 | 63.068 | 0.0 | 99.84 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.020014 | 0.020014 | 0.020014 | 0.0 | 0.03 Output | 5.5815e-05 | 5.5815e-05 | 5.5815e-05 | 0.0 | 0.00 Modify | 0.066884 | 0.066884 | 0.066884 | 0.0 | 0.11 Other | | 0.01268 | | | 0.02 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4119 ave 4119 max 4119 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 210822 ave 210822 max 210822 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 210822 Ave neighs/atom = 105.411 Neighbor list builds = 0 Dangerous builds = 0 if "${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 23759.6884341415 print "LAMMPS calculation completed" LAMMPS calculation completed quit 0