LAMMPS (27 Mar 2011) # Pour granular particles into chute container, then induce flow atom_style granular boundary p p fm newton off communicate single vel yes region reg block -10 10 -10 10 -0.5 16 units box create_box 1 reg Created orthogonal box = (-10 -10 -0.5) to (10 10 16) 2 by 2 by 1 processor grid neighbor 0.2 bin neigh_modify delay 0 # IMPORTANT NOTE: these values of stiffness (2000) and timestep (0.001) # are used in this example file to produce a quick simulation and movie. # More appropriate values for realistic simulations would be # k = 2.0e5 and dt = 0.0001, as in bench/in.chute. pair_style gran/hooke/history 2000.0 NULL 50.0 NULL 0.5 0 pair_coeff * * timestep 0.001 fix 1 all nve/sphere fix 2 all gravity 1.0 spherical 0.0 -180.0 fix zlower all wall/gran 2000.0 NULL 50.0 NULL 0.5 0 zplane 0.0 2000.0 region slab block -9.0 9.0 -9.0 9.0 10.0 15.0 units box fix ins all pour 3000 1 300719 vol 0.13 50 region slab Particle insertion: 402 every 3162 steps, 3000 by step 22135 compute 1 all erotate/sphere thermo_style custom step atoms ke c_1 vol thermo 1000 thermo_modify lost ignore norm no compute_modify thermo_temp dynamic yes dump id all atom 1000 dump.pour run 25000 Memory usage per processor = 9.4131 Mbytes Step Atoms KinEng 1 Volume 0 0 -0 0 6600 1000 402 779.98578 0 6600 2000 402 1424.4252 0 6600 3000 402 1425.0863 12.9927 6600 4000 804 1724.8627 47.36161 6600 5000 804 1599.9516 63.808734 6600 6000 804 1359.1774 63.495338 6600 7000 1206 1532.7896 68.602762 6600 8000 1206 1403.019 62.696462 6600 9000 1206 1246.5766 52.235655 6600 10000 1608 1384.2206 51.017669 6600 11000 1608 1247.6415 50.760042 6600 12000 1608 1195.7464 41.478899 6600 13000 2010 1319.9158 53.65564 6600 14000 2010 1195.3567 44.039046 6600 15000 2010 978.10764 39.976633 6600 16000 2412 1050.2028 45.306777 6600 17000 2412 1042.2556 39.814723 6600 18000 2412 894.58742 40.161025 6600 19000 2814 1009.3277 35.382235 6600 20000 2814 959.77476 43.212143 6600 21000 2814 757.47849 39.534175 6600 22000 2814 516.06689 40.398841 6600 23000 3000 425.8695 34.108574 6600 24000 3000 364.2896 21.08092 6600 25000 3000 233.88996 22.425122 6600 Loop time of 5.35857 on 4 procs for 25000 steps with 3000 atoms Pair time (%) = 2.58517 (48.2436) Neigh time (%) = 0.38742 (7.22992) Comm time (%) = 0.998725 (18.6379) Outpt time (%) = 0.0733539 (1.36891) Other time (%) = 1.3139 (24.5197) Nlocal: 750 ave 756 max 739 min Histogram: 1 0 0 0 0 1 0 0 0 2 Nghost: 393.25 ave 396 max 391 min Histogram: 1 0 1 0 0 0 1 0 0 1 Neighs: 3579.5 ave 3599 max 3555 min Histogram: 1 0 0 1 0 0 0 0 1 1 Total # of neighbors = 14318 Ave neighs/atom = 4.77267 Neighbor list builds = 1152 Dangerous builds = 0 unfix ins fix 2 all gravity 1.0 chute 26.0 run 25000 Memory usage per processor = 10.193 Mbytes Step Atoms KinEng 1 Volume 25000 3000 233.88996 22.425122 6600 26000 3000 94.802134 17.549122 6600 27000 3000 84.658562 11.506407 6600 28000 3000 149.0234 10.886705 6600 29000 3000 243.83101 12.132532 6600 30000 3000 381.15166 15.317159 6600 31000 3000 587.71932 21.367984 6600 32000 3000 826.0934 26.605551 6600 33000 3000 1140.3342 31.96551 6600 34000 3000 1505.7889 37.710536 6600 35000 3000 1960.1845 45.237554 6600 36000 3000 2472.9089 53.069981 6600 37000 3000 3112.7739 62.581623 6600 38000 3000 3734.7804 67.445495 6600 39000 3000 4500.8872 84.18578 6600 40000 3000 5355.3316 93.151633 6600 41000 3000 6255.1324 108.97752 6600 42000 3000 7324.1987 117.58036 6600 43000 3000 8367.5898 121.51706 6600 44000 3000 9496.1313 142.43277 6600 45000 3000 10606.37 154.24175 6600 46000 3000 11882.466 176.47919 6600 47000 3000 13234.56 183.71094 6600 48000 3000 14627.514 184.71949 6600 49000 3000 16011.412 206.20932 6600 50000 3000 17388.366 220.15287 6600 Loop time of 10.2705 on 4 procs for 25000 steps with 3000 atoms Pair time (%) = 5.70912 (55.5874) Neigh time (%) = 0.565246 (5.50358) Comm time (%) = 1.71767 (16.7243) Outpt time (%) = 0.119911 (1.16752) Other time (%) = 2.15857 (21.0172) Nlocal: 750 ave 763 max 736 min Histogram: 1 0 0 0 1 0 1 0 0 1 Nghost: 398.5 ave 403 max 392 min Histogram: 1 0 0 0 0 0 1 1 0 1 Neighs: 3670 ave 3803 max 3551 min Histogram: 1 0 0 1 0 1 0 0 0 1 Total # of neighbors = 14680 Ave neighs/atom = 4.89333 Neighbor list builds = 784 Dangerous builds = 0