Example file

examples/granular/en_example/particles.dat

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+Python generated LAMMPS data file
+
+2 atoms
+1 atom types
+
+0 0.08 xlo xhi
+0 0.04 ylo yhi
+0 0.08 zlo zhi
+
+Atoms # sphere
+
+1 1 0.004 2500 0.04 0.02 0.04 0 0 0
+2 1 0.004 2500 0.04 0.02 0.04416 0 0 0
+
+Velocities
+
+1 0.0  0.0 1 0 0 0
+2 0.0  0.0 -1 0 0 0

examples/granular/en_example/start.lammps

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+units	        si	
+atom_style	    sphere
+
+boundary    	p p f
+region		    box block 0 80e-3 0 40e-3 0 80e-3 open 3 open 4
+create_box	    2 box
+
+read_data	    particles.dat add append
+group 		    mb type 1
+
+pair_style granular
+pair_coeff * * hertz/material 1e6 0.8 0.4 tangential mindlin  NULL 0.0 0.5 damping enhertz
+# pair_coeff * * hertz 1e6 0.3 tangential mindlin  1e4 1.0 0.5 damping enhertz
+# pair_coeff * * hooke 1e6 0.5 tangential mindlin  1 1.0 0.0 damping enhooke
+comm_modify     vel yes
+
+timestep 	    1e-9
+fix		        1 all nve/sphere
+compute		    s all stress/atom NULL pair
+
+dump		    1 all custom 2000000 op.dump id x y z vx vy vz
+dump_modify     1 pad 8
+thermo_style	custom step ke
+run_style 	    verlet
+run		        10000000