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lammps/examples/obstacle/log.obstacle.10Sep10.linux.1
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LAMMPS (10 Sep 2010)
# 2d LJ obstacle flow
dimension 2
boundary p s p
atom_style atomic
neighbor 0.3 bin
neigh_modify delay 5
# create geometry
lattice hex 0.7
Lattice spacing in x,y,z = 1.28436 2.22457 1.28436
region box block 0 40 0 10 -0.25 0.25
create_box 3 box
Created orthogonal box = (0 0 -0.321089) to (51.3743 22.2457 0.321089)
1 by 1 by 1 processor grid
create_atoms 1 box
Created 840 atoms
mass 1 1.0
mass 2 1.0
mass 3 1.0
# LJ potentials
pair_style lj/cut 1.12246
pair_coeff * * 1.0 1.0 1.12246
# define groups
region 1 block INF INF INF 1.25 INF INF
group lower region 1
120 atoms in group lower
region 2 block INF INF 8.75 INF INF INF
group upper region 2
120 atoms in group upper
group boundary union lower upper
240 atoms in group boundary
group flow subtract all boundary
600 atoms in group flow
set group lower type 2
120 settings made for type
set group upper type 3
120 settings made for type
# initial velocities
compute mobile flow temp
velocity flow create 1.0 482748 temp mobile
fix 1 all nve
fix 2 flow temp/rescale 200 1.0 1.0 0.02 1.0
fix_modify 2 temp mobile
# Poiselle flow
velocity boundary set 0.0 0.0 0.0
fix 3 lower setforce 0.0 0.0 0.0
fix 4 upper setforce 0.0 NULL 0.0
fix 5 upper aveforce 0.0 -0.5 0.0
fix 6 flow addforce 1.0 0.0 0.0
# 2 obstacles
region void1 sphere 10 4 0 3
delete_atoms region void1
Deleted 36 atoms, new total = 804
region void2 sphere 20 7 0 3
delete_atoms region void2
Deleted 35 atoms, new total = 769
fix 7 flow indent 100 sphere 10 4 0 4
fix 8 flow indent 100 sphere 20 7 0 4
fix 9 all enforce2d
# Run
timestep 0.003
thermo 1000
thermo_modify temp mobile
dump 1 all atom 100 dump.obstacle
#dump 1 all custom 100 dump.custom id type x y z vx vy
run 25000
Memory usage per processor = 1.70365 Mbytes
Step Temp E_pair E_mol TotEng Press Volume
0 1.0027471 0 0 0.68849216 0.463265 1142.8674
1000 1 -0.33689286 0 0.34971312 1.2907615 1286.5545
2000 1 -0.36746164 0 0.31914434 1.1670767 1313.2217
3000 1 -0.52004751 0 0.16655848 1.4180076 1324.2707
4000 1 -0.50683859 0 0.17976739 1.4853867 1370.6777
5000 1 -0.49212307 0 0.19448291 1.2865932 1411.3324
6000 1 -0.45795739 0 0.22864859 1.242781 1441.6839
7000 1 -0.443252 0 0.24335398 1.2417302 1445.4704
8000 1 -0.37679433 0 0.30981165 1.1957462 1448.9419
9000 1 -0.41492237 0 0.27168361 1.0747045 1450.089
10000 1 -0.40197739 0 0.28462859 1.0279259 1456.1397
11000 1 -0.43056157 0 0.25604441 1.0722172 1449.4829
12000 1 -0.41156343 0 0.27504255 1.1499381 1452.9273
13000 1 -0.41466957 0 0.27193641 1.0548151 1455.565
14000 1 -0.41349951 0 0.27310647 1.0064325 1459.8774
15000 1 -0.4058151 0 0.28079088 0.96339054 1459.8033
16000 1 -0.37996671 0 0.30663928 1.0352366 1455.9433
17000 1 -0.35238448 0 0.3342215 0.94045311 1467.1239
18000 1 -0.39054272 0 0.29606326 1.0575731 1462.7124
19000 1 -0.36310964 0 0.32349634 0.97451832 1467.3645
20000 1 -0.37725444 0 0.30935154 0.98660138 1461.9506
21000 1 -0.37974771 0 0.30685827 0.94488958 1460.4569
22000 1 -0.35523952 0 0.33136646 1.0169815 1461.2727
23000 1 -0.36389429 0 0.32271169 1.0120096 1467.6367
24000 1 -0.40916195 0 0.27744403 0.95800623 1463.0811
25000 1 -0.39382698 0 0.292779 0.95226646 1460.6167
Loop time of 3.28141 on 1 procs for 25000 steps with 769 atoms
Pair time (%) = 0.8434 (25.7024)
Neigh time (%) = 0.193986 (5.91167)
Comm time (%) = 0.0481975 (1.46881)
Outpt time (%) = 0.29522 (8.99675)
Other time (%) = 1.9006 (57.9204)
Nlocal: 769 ave 769 max 769 min
Histogram: 1 0 0 0 0 0 0 0 0 0
Nghost: 44 ave 44 max 44 min
Histogram: 1 0 0 0 0 0 0 0 0 0
Neighs: 1647 ave 1647 max 1647 min
Histogram: 1 0 0 0 0 0 0 0 0 0
Total # of neighbors = 1647
Ave neighs/atom = 2.14174
Neighbor list builds = 1647
Dangerous builds = 0
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