# 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 ${neigh_skin} bin neighbor 2 bin # create a supercell with cubic lattice (fcc, bcc, sc, or diamond) # using 10*10*10 conventional (orthogonal) unit cells variable latticeconst_converted equal 3.302633004635573*${_u_distance} variable latticeconst_converted equal 3.302633004635573*1 lattice bcc ${latticeconst_converted} lattice bcc 3.30263300463557 Lattice spacing in x,y,z = 3.302633 3.302633 3.302633 region simbox block 0 10 0 10 0 10 units lattice create_box 1 simbox Created orthogonal box = (0 0 0) to (33.02633 33.02633 33.02633) 1 by 1 by 1 MPI processor grid create_atoms 1 box Created 2000 atoms using lattice units in orthogonal box = (0 0 0) to (33.02633 33.02633 33.02633) create_atoms CPU = 0.001 seconds variable mass_converted equal 180.9479*${_u_mass} variable mass_converted equal 180.9479*1 kim interactions Ta #=== BEGIN kim interactions ================================== pair_style kim EAM_Dynamo_LiSiegelAdams_2003_Ta__MO_103054252769_005 pair_coeff * * Ta #=== END kim interactions ==================================== mass 1 ${mass_converted} mass 1 180.9479 # initial volume variable v equal vol # assign formula variable V0 equal ${v} # evaluate initial value variable V0 equal 36023.0889135607 variable V0_metal equal ${V0}/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 36023.0889135607/(${_u_distance}*${_u_distance}*${_u_distance}) variable V0_metal equal 36023.0889135607/(1*${_u_distance}*${_u_distance}) variable V0_metal equal 36023.0889135607/(1*1*${_u_distance}) variable V0_metal equal 36023.0889135607/(1*1*1) variable V0_metal_times1000 equal ${V0_metal}*1000 variable V0_metal_times1000 equal 36023.0889135607*1000 print "Initial system volume: ${V0_metal} Angstroms^3" Initial system volume: 36023.0889135607 Angstroms^3 # set the time step to 0.001 picoseconds variable timestep_converted equal 0.001*${_u_time} variable timestep_converted equal 0.001*1 timestep ${timestep_converted} timestep 0.001 variable temp_converted equal 273.15*${_u_temperature} variable temp_converted equal 273.15*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 273.15 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 273.15 ${temp_converted} ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 273.15 273.15 ${Tdamp_converted} iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 273.15 273.15 0.01 iso ${press_converted} ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 273.15 273.15 0.01 iso 0 ${press_converted} ${Pdamp_converted} fix ensemble all npt temp 273.15 273.15 0.01 iso 0 0 ${Pdamp_converted} fix ensemble all npt temp 273.15 273.15 0.01 iso 0 0 0.1 # compute the time averages of pressure, temperature, and volume, respectively # ignore the first 5000 timesteps variable etotal_metal equal etotal/${_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 "273.15 - 1.0" variable T_up equal "273.15 + 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_103054252769_005#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 = 5.9837119 ghost atom cutoff = 5.9837119 binsize = 2.9918559, bins = 12 12 12 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) = 3.704 | 3.704 | 3.704 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 0 -16107.421 -16107.421 -16178 -16178 273.15 273.15 36023.089 36023.089 2092.769 2092.769 1000 -16034.112 -16034.112 -16105.517 -16105.517 276.34516 276.34516 35873.63 35873.63 211.90702 211.90702 Loop time of 1.45326 on 1 procs for 1000 steps with 2000 atoms Performance: 59.452 ns/day, 0.404 hours/ns, 688.106 timesteps/s, 1.376 Matom-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 | 1.3588 | 1.3588 | 1.3588 | 0.0 | 93.50 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.012775 | 0.012775 | 0.012775 | 0.0 | 0.88 Output | 4.7399e-05 | 4.7399e-05 | 4.7399e-05 | 0.0 | 0.00 Modify | 0.075887 | 0.075887 | 0.075887 | 0.0 | 5.22 Other | | 0.005773 | | | 0.40 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 2941 ave 2941 max 2941 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: 116000 ave 116000 max 116000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 116000 Ave neighs/atom = 58 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 = ${P}" flag: Temp = 272.661687880278, Press = -35.0003745129977 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 5.9837119 ghost atom cutoff = 5.9837119 binsize = 2.9918559, bins = 12 12 12 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 3.704 | 3.704 | 3.704 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 1000 -16034.112 -16034.112 -16105.517 -16105.517 276.34516 276.34516 35873.63 35873.63 211.90702 211.90702 2000 -16044.663 -16044.663 -16116.223 -16116.223 276.94492 276.94492 35927.414 35927.414 -1679.1716 -1679.1716 Loop time of 1.43625 on 1 procs for 1000 steps with 2000 atoms Performance: 60.157 ns/day, 0.399 hours/ns, 696.259 timesteps/s, 1.393 Matom-step/s 100.0% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 1.3563 | 1.3563 | 1.3563 | 0.0 | 94.43 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.010434 | 0.010434 | 0.010434 | 0.0 | 0.73 Output | 5.1897e-05 | 5.1897e-05 | 5.1897e-05 | 0.0 | 0.00 Modify | 0.06475 | 0.06475 | 0.06475 | 0.0 | 4.51 Other | | 0.00476 | | | 0.33 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 2941 ave 2941 max 2941 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 115988 ave 115988 max 115988 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 115988 Ave neighs/atom = 57.994 Neighbor list builds = 0 Dangerous builds = 0 if "${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 = ${P}" flag: Temp = 273.280589345019, Press = -8.29131905029739 next a jump SELF top variable a loop 2000 run 1000 Generated 0 of 0 mixed pair_coeff terms from geometric mixing rule Neighbor list info ... update: every = 1 steps, delay = 0 steps, check = yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 5.9837119 ghost atom cutoff = 5.9837119 binsize = 2.9918559, bins = 12 12 12 1 neighbor lists, perpetual/occasional/extra = 1 0 0 (1) pair kim, perpetual attributes: full, newton off pair build: full/bin/atomonly stencil: full/bin/3d bin: standard Per MPI rank memory allocation (min/avg/max) = 3.704 | 3.704 | 3.704 Mbytes Step TotEng v_etotal_metal PotEng v_pe_metal Temp v_T_metal Volume v_V_metal Press v_P_metal 2000 -16044.663 -16044.663 -16116.223 -16116.223 276.94492 276.94492 35927.414 35927.414 -1679.1716 -1679.1716 3000 -16041.295 -16041.295 -16112.982 -16112.982 277.43457 277.43457 35912.569 35912.569 -1194.7934 -1194.7934 Loop time of 1.40839 on 1 procs for 1000 steps with 2000 atoms Performance: 61.347 ns/day, 0.391 hours/ns, 710.030 timesteps/s, 1.420 Matom-step/s 100.0% CPU use with 1 MPI tasks x 1 OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 1.3306 | 1.3306 | 1.3306 | 0.0 | 94.48 Neigh | 0 | 0 | 0 | 0.0 | 0.00 Comm | 0.010291 | 0.010291 | 0.010291 | 0.0 | 0.73 Output | 2.6029e-05 | 2.6029e-05 | 2.6029e-05 | 0.0 | 0.00 Modify | 0.062381 | 0.062381 | 0.062381 | 0.0 | 4.43 Other | | 0.005067 | | | 0.36 Nlocal: 2000 ave 2000 max 2000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 2941 ave 2941 max 2941 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 FullNghs: 115992 ave 115992 max 115992 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 115992 Ave neighs/atom = 57.996 Neighbor list builds = 0 Dangerous builds = 0 if "${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_T273.15.out" else "print 'not_converged' file output/vol_T273.15.out" print '${V}' file output/vol_T273.15.out 35882.0067736678 print "LAMMPS calculation completed" LAMMPS calculation completed quit 0