# 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 ${neigh_skin} bin neighbor 2 bin # create a supercell with cubic lattice (fcc, bcc, sc, or diamond) # using 10*10*10 conventional (orthogonal) unit cells variable latticeconst_converted equal 2.880039922893047*${_u_distance} variable latticeconst_converted equal 2.880039922893047*1 lattice bcc ${latticeconst_converted} lattice bcc 2.88003992289305 Lattice spacing in x,y,z = 2.8800399 2.8800399 2.8800399 region simbox block 0 10 0 10 0 10 units lattice create_box 1 simbox Created orthogonal box = (0 0 0) to (28.800399 28.800399 28.800399) 1 by 1 by 1 MPI processor grid create_atoms 1 box Created 2000 atoms using lattice units in orthogonal box = (0 0 0) to (28.800399 28.800399 28.800399) create_atoms CPU = 0.000 seconds variable mass_converted equal 51.9961*${_u_mass} variable mass_converted equal 51.9961*1 kim interactions Cr #=== BEGIN kim interactions ================================== variable kim_update equal 0 variable kim_periodic equal 1 pair_style adp pair_coeff * * /tmp/kim-shared-library-parameter-file-directory-XXXXXXKZcewM/Cr.adp Cr #=== END kim interactions ==================================== mass 1 ${mass_converted} mass 1 51.9961 # initial volume variable v equal vol # assign formula variable V0 equal ${v} # evaluate initial value variable V0 equal 23888.8654231032 variable V0_metal equal ${V0}/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 23888.8654231032/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 23888.8654231032/(1*${_u_distance}*${_u_distance}) variable V0_metal equal 23888.8654231032/(1*1*${_u_distance}) variable V0_metal equal 23888.8654231032/(1*1*1) variable V0_metal_times1000 equal ${V0_metal}*1000 variable V0_metal_times1000 equal 23888.8654231032*1000 print "Initial system volume: ${V0_metal} Angstroms^3" Initial system volume: 23888.8654231032 Angstroms^3 # set the time step to 0.001 picoseconds variable timestep_converted equal 0.001*${_u_time} variable timestep_converted equal 0.001*1 timestep ${timestep_converted} timestep 0.001 variable temp_converted equal 253.15*${_u_temperature} variable temp_converted equal 253.15*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 253.15 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 253.15 ${temp_converted} ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 253.15 253.15 ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 253.15 253.15 0.01 iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 253.15 253.15 0.01 iso 0 ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 253.15 253.15 0.01 iso 0 0 ${Pdamp_converted} fix ensemble all npt temp 253.15 253.15 0.01 iso 0 0 0.1 # compute the time averages of pressure, temperature, and volume, respectively # ignore the first 5000 timesteps variable etotal_metal equal etotal/${_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 "253.15 - 1.0" variable T_up equal "253.15 + 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/SM_884076133432_000#item-citation CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE-CITE Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 7.168302 ghost atom cutoff = 7.168302 binsize = 3.584151, bins = 9 9 9 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair adp, perpetual attributes: half, newton on pair build: half/bin/atomonly/newton stencil: half/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 6.35 | 6.35 | 6.35 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 0 -8134.6264 -8134.6264 -8200.0381 -8200.0381 253.15 253.15 23888.865 23888.865 2924.7288 2924.7288 1000 -8070.1497 -8070.1497 -8135.1427 -8135.1427 251.52987 251.52987 23940.168 23940.168 -426.19977 -426.19977 Loop time of 6.94448 on 1 procs for 1000 steps with 2000 atoms Performance: 12.442 ns/day, 1.929 hours/ns, 143.999 timesteps/s, 287.998 katom-step/s 99.4% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 6.861 | 6.861 | 6.861 | 0.0 | 98.80 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.015093 | 0.015093 | 0.015093 | 0.0 | 0.22 Output | 7.2096e-05 | 7.2096e-05 | 7.2096e-05 | 0.0 | 0.00 Modify | 0.062477 | 0.062477 | 0.062477 | 0.0 | 0.90 Other | | 0.005865 | | | 0.08 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: 136000 ave 136000 max 136000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 136000 Ave neighs/atom = 68 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 = ${P}" flag: Temp = 252.479975222574, Press = 29.0153394868319 next a jump SELF top variable a loop 2000 run 1000 Per MPI rank memory allocation (min/avg/max) = 6.353 | 6.353 | 6.353 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 1000 -8070.1497 -8070.1497 -8135.1427 -8135.1427 251.52987 251.52987 23940.168 23940.168 -426.19977 -426.19977 2000 -8069.0724 -8069.0724 -8135.5684 -8135.5684 257.34608 257.34608 23941.627 23941.627 -502.52611 -502.52611 Loop time of 7.71078 on 1 procs for 1000 steps with 2000 atoms Performance: 11.205 ns/day, 2.142 hours/ns, 129.689 timesteps/s, 259.377 katom-step/s 99.5% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 7.624 | 7.624 | 7.624 | 0.0 | 98.87 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.016031 | 0.016031 | 0.016031 | 0.0 | 0.21 Output | 5.9902e-05 | 5.9902e-05 | 5.9902e-05 | 0.0 | 0.00 Modify | 0.064684 | 0.064684 | 0.064684 | 0.0 | 0.84 Other | | 0.006052 | | | 0.08 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4417 ave 4417 max 4417 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 133916 ave 133916 max 133916 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 133916 Ave neighs/atom = 66.958 Neighbor list builds = 0 Dangerous builds = 0 if "${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_T253.15.out" else "print 'not_converged' file output/vol_T253.15.out" print '${V}' file output/vol_T253.15.out 23937.690306933 print "LAMMPS calculation completed" LAMMPS calculation completed quit 0