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lammps/examples/flow/log.flow.poiss.10Sep10.linux.4
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LAMMPS (10 Sep 2010)
# 2-d LJ flow simulation
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 20 0 10 -0.25 0.25
create_box 3 box
Created orthogonal box = (0 0 -0.321089) to (25.6871 22.2457 0.321089)
2 by 2 by 1 processor grid
create_atoms 1 box
Created 420 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
60 atoms in group lower
region 2 block INF INF 8.75 INF INF INF
group upper region 2
60 atoms in group upper
group boundary union lower upper
120 atoms in group boundary
group flow subtract all boundary
300 atoms in group flow
set group lower type 2
60 settings made for type
set group upper type 3
60 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
# Couette flow
#velocity lower set 0.0 0.0 0.0
#velocity upper set 3.0 0.0 0.0
#fix 3 boundary setforce 0.0 0.0 0.0
#fix 4 all enforce2d
# Poisseuille 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 -1.0 0.0
fix 6 flow addforce 0.5 0.0 0.0
fix 7 all enforce2d
# Run
timestep 0.003
thermo 500
thermo_modify temp mobile
dump 1 all atom 25 dump.flow
run 10000
Memory usage per processor = 1.67714 Mbytes
Step Temp E_pair E_mol TotEng Press Volume
0 1 0 0 0.71190476 0.5232453 571.43371
500 1.0758737 -0.36090417 0 0.40501541 2.782759 574.95676
1000 1 -0.35701441 0 0.35489035 2.0579148 585.60492
1500 1.2368663 -0.37709732 0 0.50343367 1.4868643 587.08385
2000 1 -0.39362939 0 0.31827537 1.4238684 578.83266
2500 1.2272957 -0.423819 0 0.44989866 1.4547395 570.04942
3000 1 -0.49143403 0 0.22047073 1.5348969 554.87718
3500 1.2444908 -0.597618 0 0.2883409 1.8757604 536.90691
4000 1 -0.70133089 0 0.010573874 2.1399937 521.35928
4500 1.2212572 -0.74525028 0 0.12416857 2.7605953 507.52559
5000 1 -0.77887442 0 -0.066969662 2.9849792 501.10169
5500 1.2118683 -0.76479769 0 0.097937148 2.7555194 505.25255
6000 1 -0.64166654 0 0.070238224 2.4653816 510.17292
6500 1.2230732 -0.66072614 0 0.20998549 2.0855543 517.97007
7000 1 -0.61750407 0 0.094400687 1.9316563 520.97755
7500 1.2289276 -0.68159213 0 0.19328728 2.0003789 520.18556
8000 1 -0.69786226 0 0.014042499 2.1485637 517.24977
8500 1.2206044 -0.75028089 0 0.11867321 2.3924356 513.28362
9000 1 -0.75191705 0 -0.040012285 2.521768 509.91505
9500 1.2149548 -0.71491732 0 0.15001477 2.3827722 508.86228
10000 1 -0.71239141 0 -0.00048664424 2.3193862 508.75244
Loop time of 0.583839 on 4 procs for 10000 steps with 420 atoms
Pair time (%) = 0.0577239 (9.88695)
Neigh time (%) = 0.0102308 (1.75233)
Comm time (%) = 0.152556 (26.1298)
Outpt time (%) = 0.172096 (29.4766)
Other time (%) = 0.191233 (32.7544)
Nlocal: 105 ave 107 max 104 min
Histogram: 2 0 0 1 0 0 0 0 0 1
Nghost: 43.5 ave 45 max 42 min
Histogram: 1 0 0 1 0 0 1 0 0 1
Neighs: 279.5 ave 296 max 265 min
Histogram: 2 0 0 0 0 0 0 1 0 1
Total # of neighbors = 1118
Ave neighs/atom = 2.6619
Neighbor list builds = 565
Dangerous builds = 0
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