Dear lammps users,
I am trying to model a 2d rotating drum… so far, I think I have gathered all the code I need in order to produce a simulation.
But, the simulation seems unstable (as you can see in the attachments).
Below is my code
clear
=== initializing ===
units si
atom_style sphere
dimension 2
boundary f f p
newton off
communicate single vel yes
==== Defining the region ====
lattice sq 0.5
region BLOCK2 cylinder z 0 0 100 -0.5 0.5
region BLOCK4 block -100 100 -100 -50 -0.5 0.5
region HALF intersect 2 BLOCK2 BLOCK4
create_box 1 BLOCK2
create_atoms 1 region HALF
group ATOM region HALF
region HALF delete
pair_style gran/hooke 2.0e5 NULL 50.0 NULL 0.5 0
pair_coeff * *
==== Fixes ====
timestep 0.001
fix f1 ATOM nve/sphere
fix f2 ATOM enforce2d
fix f3 ATOM gravity 9.81 vector 0.0 -1.0 0.0
fix f4 ATOM wall/gran 10000.0 0.0 64.0 64.0 0.5 1 zcylinder 100 shear x 20
compute 1 ATOM erotate/sphere
dump myDump all image 3 dump.*.jpg type type
==== Run it ====
run 10
can anyone see what is going wrong?
I tried different timesteps… but this did not help. Besides that, I also have the vague idea that my fix f4 is being ignored by the particles… Since, when I decrease the radius of this fix, the particles do not interact with the wall.
Thanks in advance!
Gr.
Seb
