Dear sir.# # I want to create a simulation of fluid flow on a solid surface. I wrote an input script to allow fluids to flow over solids via lammps example. However, there is no friction between the solids and the fluids. I would like to set a no slip condition between them.# What commands do I need to set this condition?# # Thank you for reading my mail.
My input script
2d flow
dimension 2
boundary p p p
atom_style atomic
neighbor 0.3 bin
neigh_modify delay 5
create geometry
lattice hex 0.7
region box block 0 80 0 10 -0.5 0.55
create_box 2 box
create_atoms 1 box
mass 1 1.0
mass 2 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
group boundary union lower #upper
group flow subtract all boundary
set group lower type 2
initial velocities
compute mobile flow temp
velocity flow create 1 482748 temp mobile
fix 1 all nve
fix 2 flow temp/rescale 20 1.0 100.0 150 1.0
fix_modify 2 temp mobile
flow
velocity boundary set 0.0 0.0 0.0
fix 3 lower setforce 0.0 0.0 0.0
fix 6 flow addforce 5.0 0.0 0.0
Run
timestep 0.003
thermo 1000
thermo_modify temp mobile
dump 1 all atom 100 dump.flow.*
run 25000