Installation:
in windows : Download LAMMPS and install. Link
in Linux :
1.In Terminal first add repository by :
sudo add-apt-repository ppa:gladky-anton/lammps
sudo apt-get update2.then install by :
sudo apt-get install lammps-dailyLet’s start!
As a Start, we will run and modify some code from Example directory.
*Note : Please Let me know if I had any mistake.
Code 1 : Simulate friction of two surfaces with triangle cross section.
# 2d friction simulation
log AliBakhshi.log
dimension 2
boundary p s p
atom_style atomic
units lj
lattice hex 0.9
region box block 0 50 0 22 -0.25 0.25
create_box 4 box
mass 1 1.0
mass 2 1.0
mass 3 1.0
mass 4 1.0
#region box block 0 50 0 22 -0.25 0.25
region lo-fixed block INF INF INF 1.1 INF INF
region lo-slab block INF INF INF 7 INF INF
region above-lo block INF INF INF 7 INF INF side out
region hi-fixed block INF INF 20.9 INF INF INF
region hi-slab block INF INF 15 INF INF INF
region below-hi block INF INF 15 INF INF INF side out
region lo-asperity1 cone y 5 0 5 0 8 12
region lo-asperity2 cone y 15 0 5 0 8 12
region lo-asperity union 2 lo-asperity1 lo-asperity2
region hi-asperity1 cone y 34 0 0 5 9 15
region hi-asperity2 cone y 24 0 0 5 9 15
region hi-asperity3 cone y 44 0 0 5 9 15
region hi-asperity union 3 hi-asperity1 hi-asperity2 hi-asperity3
region asd sphere 0 0 0 0 side out
region lo-half-sphere intersect 2 lo-asperity above-lo
region hi-half-sphere intersect 2 hi-asperity below-hi
region lo-slab1 intersect 2 lo-slab asd
create_atoms 1 region lo-slab1
create_atoms 1 region hi-slab
create_atoms 2 region lo-half-sphere
create_atoms 3 region hi-half-sphere
pair_style lj/cut 2.5
pair_coeff * * 1.0 1.0
group lo region lo-slab
group lo type 2
group hi region hi-slab
group hi type 3
group lo-fixed region lo-fixed
group hi-fixed region hi-fixed
group boundary union lo-fixed hi-fixed
group mobile subtract all boundary
group lhs region lo-half-sphere
group hhs region hi-half-sphere
set group lo-fixed type 4
set group hi-fixed type 4
compute new mobile temp/partial 0 1 0
velocity mobile create 0.1 482748 temp new
velocity hi set 0.2 0.0 0.0 sum yes
fix 1 all nve
fix 2 boundary setforce 0.0 0.0 0.0
fix 3 mobile temp/rescale 200 0.1 0.1 0.02 1.0
fix_modify 3 temp new
fix 4 all enforce2d
timestep 0.025
thermo 100
thermo_modify temp new
dump 10 all xyz 100 fric.xyz
dump 11 lhs custom 100 dump.fl id type x y z vx vy vz fx fy fz
dump 12 hhs custom 100 dump.fh id type x y z vx vy vz fx fy fz
run 20000