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) 4 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 = 9.54553 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 1652.9645 91.148046 5000 11000 896 1544.0839 72.455734 5000 12000 896 1482.8514 61.292588 5000 13000 1000 1475.79 53.415861 5000 14000 1000 1352.8641 48.564355 5000 15000 1000 1139.726 49.60352 5000 16000 1000 764.34421 48.189757 5000 17000 1000 455.09361 40.071967 5000 18000 1000 327.13469 31.827836 5000 19000 1000 148.91195 27.999011 5000 20000 1000 38.454385 18.618798 5000 21000 1000 22.643678 12.282344 5000 22000 1000 15.147799 9.0623019 5000 23000 1000 14.799777 6.3928279 5000 24000 1000 13.08654 4.3024153 5000 25000 1000 9.9394032 2.8165017 5000 Loop time of 1.00262 on 4 procs for 25000 steps with 1000 atoms Pair time (%) = 0.317535 (31.6705) Neigh time (%) = 0.0773075 (7.71053) Comm time (%) = 0.0878609 (8.76312) Outpt time (%) = 0.0486338 (4.85067) Other time (%) = 0.471284 (47.0052) Nlocal: 250 ave 256 max 242 min Histogram: 1 0 0 0 1 0 0 0 1 1 Nghost: 17.75 ave 27 max 10 min Histogram: 2 0 0 0 0 0 0 1 0 1 Neighs: 593.25 ave 615 max 562 min Histogram: 1 0 0 0 0 0 1 1 0 1 Total # of neighbors = 2373 Ave neighs/atom = 2.373 Neighbor list builds = 1970 Dangerous builds = 0