LAMMPS (10 Jan 2012) # Pour 2d granular particles into container dimension 2 atom_style sphere boundary f fm p newton off communicate single vel yes region reg block 0 100 0 50 -0.5 0.5 units box create_box 1 reg Created orthogonal box = (0 0 -0.5) to (100 50 0.5) 1 by 1 by 1 MPI processor grid neighbor 0.2 bin neigh_modify delay 0 # IMPORTANT NOTE: these values of stiffness (4000) 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 = 4.0e5 and dt = 0.0001, as in bench/in.chute (if it were Hertzian). pair_style gran/hertz/history 4000.0 NULL 100.0 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 xwalls all wall/gran 4000.0 NULL 100.0 NULL 0 1 xplane 0 100 fix ywalls all wall/gran 4000.0 NULL 100.0 NULL 0 1 yplane 0 NULL region slab block 1.0 99.0 30 34.5 -0.5 0.5 units box fix ins all pour 1000 1 4767548 vol 0.4 10 diam 0.5 1.0 region slab Particle insertion: 224 every 3000 steps, 1000 by step 12001 fix 3 all enforce2d 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 250 dump.pour run 25000 Memory usage per processor = 9.58 Mbytes Step Atoms KinEng 1 Volume 0 0 -0 0 5000 1000 224 185.87695 0 5000 2000 224 348.08417 0 5000 3000 224 565.2162 0 5000 4000 448 1042.9716 0 5000 5000 448 1542.0614 0 5000 6000 448 1766.5136 41.192729 5000 7000 672 1846.4596 67.352592 5000 8000 672 1814.3429 92.898167 5000 9000 672 1662.3648 111.88805 5000 10000 896 1654.7992 91.210682 5000 11000 896 1539.2643 72.174442 5000 12000 896 1479.3613 60.304466 5000 13000 1000 1464.6099 54.360683 5000 14000 1000 1357.776 50.981395 5000 15000 1000 1129.2816 50.644045 5000 16000 1000 795.55925 47.94934 5000 17000 1000 448.80612 42.4465 5000 18000 1000 320.15236 34.231318 5000 19000 1000 150.74762 35.789901 5000 20000 1000 49.636313 19.317565 5000 21000 1000 24.980341 13.517257 5000 22000 1000 17.164368 9.7652983 5000 23000 1000 15.131329 7.6229469 5000 24000 1000 13.291283 5.8822567 5000 25000 1000 12.481182 3.8348041 5000 Loop time of 2.97817 on 1 procs for 25000 steps with 1000 atoms Pair time (%) = 1.23279 (41.3941) Neigh time (%) = 0.302755 (10.1658) Comm time (%) = 0.0113213 (0.380143) Outpt time (%) = 0.0628569 (2.11059) Other time (%) = 1.36845 (45.9494) Nlocal: 1000 ave 1000 max 1000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 0 ave 0 max 0 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 2377 ave 2377 max 2377 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 2377 Ave neighs/atom = 2.377 Neighbor list builds = 2001 Dangerous builds = 0