# 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 ${neigh_skin} bin neighbor 2 bin # create a supercell with cubic lattice (fcc, bcc, sc, or diamond) # using 10*10*10 conventional (orthogonal) unit cells variable latticeconst_converted equal 3.167413115501404*${_u_distance} variable latticeconst_converted equal 3.167413115501404*1 lattice bcc ${latticeconst_converted} lattice bcc 3.1674131155014 Lattice spacing in x,y,z = 3.1674131 3.1674131 3.1674131 region simbox block 0 10 0 10 0 10 units lattice create_box 1 simbox Created orthogonal box = (0 0 0) to (31.674131 31.674131 31.674131) 1 by 1 by 1 MPI processor grid create_atoms 1 box Created 2000 atoms using lattice units in orthogonal box = (0 0 0) to (31.674131 31.674131 31.674131) create_atoms CPU = 0.000 seconds variable mass_converted equal 95.94*${_u_mass} variable mass_converted equal 95.94*1 kim interactions Mo #=== BEGIN kim interactions ================================== variable kim_update equal 0 variable kim_periodic equal 1 pair_style meam/spline pair_coeff * * /tmp/kim-shared-library-parameter-file-directory-XXXXXXT3cpzT/coeff.Mo.meam.spline 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 31777.0905924228 variable V0_metal equal ${V0}/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 31777.0905924228/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 31777.0905924228/(1*${_u_distance}*${_u_distance}) variable V0_metal equal 31777.0905924228/(1*1*${_u_distance}) variable V0_metal equal 31777.0905924228/(1*1*1) variable V0_metal_times1000 equal ${V0_metal}*1000 variable V0_metal_times1000 equal 31777.0905924228*1000 print "Initial system volume: ${V0_metal} Angstroms^3" Initial system volume: 31777.0905924228 Angstroms^3 # set the time step to 0.001 picoseconds variable timestep_converted equal 0.001*${_u_time} variable timestep_converted equal 0.001*1 timestep ${timestep_converted} timestep 0.001 variable temp_converted equal 313.15*${_u_temperature} variable temp_converted equal 313.15*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 313.15 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 313.15 ${temp_converted} ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 313.15 313.15 ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 313.15 313.15 0.01 iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 313.15 313.15 0.01 iso 0 ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 313.15 313.15 0.01 iso 0 0 ${Pdamp_converted} fix ensemble all npt temp 313.15 313.15 0.01 iso 0 0 0.1 # compute the time averages of pressure, temperature, and volume, respectively # ignore the first 5000 timesteps variable etotal_metal equal etotal/${_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 "313.15 - 1.0" variable T_up equal "313.15 + 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_769176993156_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 = 7.9 ghost atom cutoff = 7.9 binsize = 3.95, bins = 9 9 9 2 neighbor lists, perpetual/occasional/extra = 2 0 0 (1) pair meam/spline, perpetual attributes: full, newton on pair build: full/bin/atomonly stencil: full/bin/3d bin: standard (2) pair meam/spline, perpetual, half/full from (1) attributes: half, newton on pair build: halffull/newton stencil: none bin: none Per MPI rank memory allocation (min/avg/max) = 5.147 | 5.147 | 5.147 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 0 -13553.84 -13553.84 -13634.755 -13634.755 313.15 313.15 31777.091 31777.091 2719.7731 2719.7731 1000 -13471.767 -13471.767 -13551.555 -13551.555 308.78617 308.78617 31921.929 31921.929 1569.3613 1569.3613 Loop time of 122.774 on 1 procs for 1000 steps with 2000 atoms Performance: 0.704 ns/day, 34.104 hours/ns, 8.145 timesteps/s, 16.290 katom-step/s 95.9% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 122.68 | 122.68 | 122.68 | 0.0 | 99.92 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.016713 | 0.016713 | 0.016713 | 0.0 | 0.01 Output | 0.00010435 | 0.00010435 | 0.00010435 | 0.0 | 0.00 Modify | 0.070664 | 0.070664 | 0.070664 | 0.0 | 0.06 Other | | 0.007188 | | | 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: 136000 ave 136000 max 136000 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 = ${P}" flag: Temp = 313.058019633131, Press = 81.1287423171806 next a jump SELF top variable a loop 2000 run 1000 Per MPI rank memory allocation (min/avg/max) = 5.152 | 5.152 | 5.152 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 1000 -13471.767 -13471.767 -13551.555 -13551.555 308.78617 308.78617 31921.929 31921.929 1569.3613 1569.3613 2000 -13473.366 -13473.366 -13552.561 -13552.561 306.49311 306.49311 31921.037 31921.037 1161.5155 1161.5155 Loop time of 118.533 on 1 procs for 1000 steps with 2000 atoms Performance: 0.729 ns/day, 32.926 hours/ns, 8.436 timesteps/s, 16.873 katom-step/s 98.9% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 118.44 | 118.44 | 118.44 | 0.0 | 99.92 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.017521 | 0.017521 | 0.017521 | 0.0 | 0.01 Output | 5.6316e-05 | 5.6316e-05 | 5.6316e-05 | 0.0 | 0.00 Modify | 0.072027 | 0.072027 | 0.072027 | 0.0 | 0.06 Other | | 0.007233 | | | 0.01 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4521 ave 4521 max 4521 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 134830 ave 134830 max 134830 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 269660 ave 269660 max 269660 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 269660 Ave neighs/atom = 134.83 Neighbor list builds = 0 Dangerous builds = 0 if "${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 = ${P}" flag: Temp = 313.512784634322, Press = 6.20241575430865 next a jump SELF top variable a loop 2000 run 1000 Per MPI rank memory allocation (min/avg/max) = 5.152 | 5.152 | 5.152 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 2000 -13473.366 -13473.366 -13552.561 -13552.561 306.49311 306.49311 31921.037 31921.037 1161.5155 1161.5155 3000 -13476.333 -13476.333 -13555.229 -13555.229 305.3352 305.3352 31941.076 31941.076 -246.95785 -246.95785 Loop time of 118.368 on 1 procs for 1000 steps with 2000 atoms Performance: 0.730 ns/day, 32.880 hours/ns, 8.448 timesteps/s, 16.896 katom-step/s 99.1% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 118.27 | 118.27 | 118.27 | 0.0 | 99.92 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.017822 | 0.017822 | 0.017822 | 0.0 | 0.02 Output | 5.0324e-05 | 5.0324e-05 | 5.0324e-05 | 0.0 | 0.00 Modify | 0.072724 | 0.072724 | 0.072724 | 0.0 | 0.06 Other | | 0.007344 | | | 0.01 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 4490 ave 4490 max 4490 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 134621 ave 134621 max 134621 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 269242 ave 269242 max 269242 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 269242 Ave neighs/atom = 134.621 Neighbor list builds = 0 Dangerous builds = 0 if "${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_T313.15.out" else "print 'not_converged' file output/vol_T313.15.out" print '${V}' file output/vol_T313.15.out 31939.5424243015 print "LAMMPS calculation completed" LAMMPS calculation completed quit 0