Dear Lammps users,
I have to design a recoater/powder spreader in LAMMPS for spreading powder in Powder Bed. I am using the granular code from the Lammps website and want to introduce a spreader in the bed. Here is the code and a snapshot of the spreader is attached. Thank you.
Pour granular particles into chute container, then induce flow
atom_style sphere #Spheres has per-particle diameter and mass
boundary p p f
newton off #Two interacting atoms are on different processors and the resulting force information is not communicated.
comm_modify vel yes #Conserving properties to two ghost atoms
region reg block -20 20 -10 10 -0.5 16 units box
create_box 1 reg
variable dx equal ramp(0,10)
region 2 sphere 10.0 10.0 0.0 5 move v_dx NULL NULL
neighbor 0.2 bin
neigh_modify delay 0
IMPORTANT NOTE: these values of stiffness (2000) and timestep (0.001)
are used in this example file to produce a quick simulation and movie.
More appropriate values for realistic simulations would be
k = 2.0e5 and dt = 0.0001, as in bench/in.chute.
pair_style gran/hooke/history 2000.0 NULL 50.0 NULL 0.5 0
pair_coeff * *
timestep 0.001
fix 1 all nve/sphere
fix 2 all gravity 1.0 spherical 0.0 -180.0
fix zlower all wall/gran hooke/history 2000.0 NULL 50.0 NULL 0.5 0 &
zplane 0.0 2000.0
region slab block -19.0 -9.5 -9.0 9.0 10.0 15.0 units box
fix ins all pour 10000 1 300719 vol 0.13 50 region slab
compute 1 all erotate/sphere #erotate/sphere comutes the rotational kinetic energy
thermo_style custom step atoms ke c_1 vol #c_1 is coumpted with compute id
thermo 100
thermo_modify lost ignore norm no #ignore value does not check for lost atoms, norm value normalized the thermodyanmic paprameters
compute_modify thermo_temp dynamic/dof yes
dump id all atom 100 dump.pour
dump 1 all custom 100 positions.lammpstrj id x y z vx vy vz
dump 2 all image 100 image.*.jpg type type &
axes yes 0.8 0.02 view 80 -30
#dump_modify 2 pad 5
dump 3 all movie 100 movie.mpg type type &
axes yes 0.8 0.02 view 80 -30
#dump_modify 3 pad 5
run 100000
unfix ins
fix 2 all gravity 1.0 chute 26.0
run 5000
Best regards,
Yeasir Mohammad Akib
MS student, Manufacturing Engineering
University of Texas Rio Grande Valley
