LAMMPS (10 Jan 2012) # Pour granular particles into chute container, then induce flow atom_style sphere 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) 1 by 1 by 1 MPI 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 = 9.46169 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 1724.8532 47.325647 6600 5000 804 1598.6681 64.779741 6600 6000 804 1364.8231 61.75911 6600 7000 1206 1519.7287 69.028648 6600 8000 1206 1409.6162 62.604938 6600 9000 1206 1243.5344 53.025705 6600 10000 1608 1400.9581 57.452979 6600 11000 1608 1225.6036 52.631505 6600 12000 1608 1184.2735 45.623535 6600 13000 2010 1298.3639 50.266254 6600 14000 2010 1177.6607 41.899866 6600 15000 2010 986.18539 45.283438 6600 16000 2412 1032.5845 41.218715 6600 17000 2412 1024.6469 39.790283 6600 18000 2412 913.80876 40.351496 6600 19000 2814 1010.144 39.468447 6600 20000 2814 953.92496 40.689106 6600 21000 2814 762.62053 42.228087 6600 22000 2814 517.63012 38.535819 6600 23000 3000 424.8833 34.836058 6600 24000 3000 363.8636 21.972506 6600 25000 3000 210.08035 24.819644 6600 Loop time of 9.40419 on 1 procs for 25000 steps with 3000 atoms Pair time (%) = 5.45799 (58.0379) Neigh time (%) = 1.0322 (10.9759) Comm time (%) = 0.250612 (2.66489) Outpt time (%) = 0.0380349 (0.404446) Other time (%) = 2.62535 (27.9168) Nlocal: 3000 ave 3000 max 3000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 670 ave 670 max 670 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 13595 ave 13595 max 13595 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 13595 Ave neighs/atom = 4.53167 Neighbor list builds = 1152 Dangerous builds = 0 unfix ins fix 2 all gravity 1.0 chute 26.0 run 25000 Memory usage per processor = 10.2619 Mbytes Step Atoms KinEng 1 Volume 25000 3000 210.08035 24.819644 6600 26000 3000 114.38566 17.150932 6600 27000 3000 104.67608 12.322911 6600 28000 3000 183.35846 11.491313 6600 29000 3000 304.77431 13.371079 6600 30000 3000 483.13283 15.775148 6600 31000 3000 698.65983 22.583167 6600 32000 3000 997.91493 29.132887 6600 33000 3000 1381.6582 36.071846 6600 34000 3000 1807.7933 39.766028 6600 35000 3000 2308.8013 49.301118 6600 36000 3000 2872.3529 55.638219 6600 37000 3000 3528.2521 68.672321 6600 38000 3000 4243.7668 78.210271 6600 39000 3000 5050.5727 86.453776 6600 40000 3000 5777.2063 90.664206 6600 41000 3000 6697.0059 105.74557 6600 42000 3000 7649.5485 121.09489 6600 43000 3000 8695.8277 129.0904 6600 44000 3000 9843.446 146.82081 6600 45000 3000 10998.776 143.2563 6600 46000 3000 12138.363 170.04079 6600 47000 3000 13412.445 174.29258 6600 48000 3000 14479.945 179.49372 6600 49000 3000 15616.206 182.18045 6600 50000 3000 16633.42 195.0737 6600 Loop time of 18.5002 on 1 procs for 25000 steps with 3000 atoms Pair time (%) = 12.0726 (65.2567) Neigh time (%) = 1.54973 (8.37683) Comm time (%) = 0.540591 (2.92209) Outpt time (%) = 0.0597088 (0.322747) Other time (%) = 4.27755 (23.1217) Nlocal: 3000 ave 3000 max 3000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 747 ave 747 max 747 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 13861 ave 13861 max 13861 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 13861 Ave neighs/atom = 4.62033 Neighbor list builds = 807 Dangerous builds = 0