forked from lijiext/lammps
141 lines
4.6 KiB
Groff
141 lines
4.6 KiB
Groff
LAMMPS (7 Jul 2009)
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# 2d friction simulation
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dimension 2
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boundary p s p
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atom_style atomic
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neighbor 0.3 bin
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neigh_modify delay 5
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# create geometry
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lattice hex 0.9
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Lattice spacing in x,y,z = 1.1327 1.96189 1.1327
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region box block 0 50 0 22 -0.25 0.25
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create_box 4 box
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Created orthogonal box = (0 0 -0.283174) to (56.6348 43.1615 0.283174)
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1 by 1 by 1 processor grid
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mass 1 1.0
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mass 2 1.0
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mass 3 1.0
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mass 4 1.0
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# atom regions
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region lo-fixed block INF INF INF 1.1 INF INF
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region lo-slab block INF INF INF 7 INF INF
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region above-lo block INF INF INF 7 INF INF side out
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region hi-fixed block INF INF 20.9 INF INF INF
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region hi-slab block INF INF 15 INF INF INF
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region below-hi block INF INF 15 INF INF INF side out
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region lo-asperity sphere 32 7 0 8
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region hi-asperity sphere 18 15 0 8
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region lo-half-sphere intersect 2 lo-asperity above-lo
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region hi-half-sphere intersect 2 hi-asperity below-hi
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# create 2 surfaces with asperities
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create_atoms 1 region lo-slab
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Created 750 atoms
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create_atoms 1 region hi-slab
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Created 750 atoms
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create_atoms 2 region lo-half-sphere
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Created 112 atoms
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create_atoms 3 region hi-half-sphere
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Created 112 atoms
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# LJ potentials
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pair_style lj/cut 2.5
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pair_coeff * * 1.0 1.0 2.5
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# define groups
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group lo region lo-slab
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750 atoms in group lo
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group lo type 2
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862 atoms in group lo
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group hi region hi-slab
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750 atoms in group hi
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group hi type 3
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862 atoms in group hi
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group lo-fixed region lo-fixed
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150 atoms in group lo-fixed
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group hi-fixed region hi-fixed
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150 atoms in group hi-fixed
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group boundary union lo-fixed hi-fixed
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300 atoms in group boundary
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group mobile subtract all boundary
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1424 atoms in group mobile
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set group lo-fixed type 4
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150 settings made for type
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set group hi-fixed type 4
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150 settings made for type
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# initial velocities
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compute new mobile temp/partial 0 1 0
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velocity mobile create 0.1 482748 temp new
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velocity hi set 1.0 0.0 0.0 sum yes
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# fixes
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fix 1 all nve
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fix 2 boundary setforce 0.0 0.0 0.0
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fix 3 mobile temp/rescale 200 0.1 0.1 0.02 1.0
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fix_modify 3 temp new
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# Run
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timestep 0.0025
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thermo 1000
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thermo_modify temp new
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dump 1 all atom 500 dump.friction
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run 20000
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Memory usage per processor = 1.73539 Mbytes
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Step Temp E_pair E_mol TotEng Press Volume
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0 0.1 -3.1333672 0 -3.0921259 -1.1440102 2444.4558
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1000 0.1 -3.0915465 0 -3.0503052 0.010017516 2444.4558
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2000 0.1 -3.0826487 0 -3.0414074 -0.42021097 2444.4558
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3000 0.089819692 -3.07584 0 -3.0387972 -0.25257042 2444.4558
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4000 0.098489874 -3.0667093 0 -3.0260907 -0.25511521 2444.4558
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5000 0.11379986 -3.0557087 0 -3.0087762 -0.080886978 2444.4558
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6000 0.11269179 -3.04532 0 -2.9988445 -0.33387724 2444.4558
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7000 0.1 -3.0380598 0 -2.9968185 -0.32430283 2444.4558
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8000 0.1 -3.0346457 0 -2.9934044 -0.38023276 2444.4558
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9000 0.1 -3.0327792 0 -2.9915379 -0.43204961 2444.4558
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10000 0.11908329 -3.0384756 0 -2.9893641 -0.34377218 2444.4558
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11000 0.1 -3.0307666 0 -2.9895253 -0.46039249 2444.4558
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12000 0.11748666 -3.0410033 0 -2.9925503 -0.21956005 2444.4558
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13000 0.1 -3.0416003 0 -3.000359 -0.3651589 2444.4558
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14000 0.11069381 -3.0439855 0 -2.998334 -0.28704457 2444.4558
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15000 0.11218605 -3.0480708 0 -3.0018038 -0.32666261 2444.4558
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16000 0.11189162 -3.0483127 0 -3.0021671 -0.23171462 2444.4558
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17000 0.11423906 -3.0474938 0 -3.0003802 -0.34260897 2444.4558
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18000 0.11548632 -3.047828 0 -3.0002 -0.31060102 2444.4558
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19000 0.10034246 -3.0488263 0 -3.0074438 -0.2527683 2444.4558
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20000 0.10505024 -3.0494404 0 -3.0061164 -0.31791192 2444.4558
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Loop time of 10.8242 on 1 procs for 20000 steps with 1724 atoms
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Pair time (%) = 9.04606 (83.5728)
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Neigh time (%) = 0.446001 (4.12042)
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Comm time (%) = 0.0695286 (0.642346)
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Outpt time (%) = 0.105748 (0.976966)
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Other time (%) = 1.15683 (10.6875)
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Nlocal: 1724 ave 1724 max 1724 min
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Histogram: 1 0 0 0 0 0 0 0 0 0
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Nghost: 146 ave 146 max 146 min
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Histogram: 1 0 0 0 0 0 0 0 0 0
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Neighs: 14389 ave 14389 max 14389 min
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Histogram: 1 0 0 0 0 0 0 0 0 0
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Total # of neighbors = 14389
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Ave neighs/atom = 8.34629
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Neighbor list builds = 723
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Dangerous builds = 0
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