LIGGGHTS® - User Forum

Hello,

I want to insert particles in cad files. after that compress it and rotate it. When I'm trying to execute the program. particles are falling down to cad files. .Plate is not rotating. Can anyone help me . Please find the code below:

### Initialization

# Preliminaries
soft_particles yes
units cgs
atom_style granular
boundary f f f
atom_modify map array sort 10000 2.0
neigh_modify delay 0 every 1 check yes page 500000 one 50000
newton off
communicate single vel yes
processors * * *

Hello everyone,

Hi there,

I am trying to run a simulation with ~120 million particles on an HPC system using a slightly modified version of LIGGGHTS-INL.

When I restart the simulation after an initial setup stage, it becomes stuck in an apparent infinite loop in read_restart.cpp. After extensive troubleshooting, I suspect this may be related to unexpected behavior in how certain variables are handled during restart, and I would appreciate any insight from those more familiar with this part of the code.

Hello. I want to use LIGGGHTS and later CFDEMcoupling to simulate a coaxial rheometer which in theory is a hollow cylinder with a rotating inner wall.
My question: How do I create this geometry in LIGGGHTS without importing a mesh file?

Hi everyone,
I'm trying to adapt the example case "examples\LIGGGHTS\Tutorials_public\movingMeshGran" so that it could compute the forces and momentum on the bucket moved on the particules.

I tried :

compute force_on_particles all reduce sum fx fy fz
fix 20 all ave/time 100 1 100 c_force_on_particles[1] c_force_on_particles[2] c_force_on_particles[3] file force_particles.txt


but I guess the force are not particulary applied on the bucket

Hello,

Hello everyone,

label loop_growth

run ${grow_every2}

variable curr_dia2 equal ${start_dia2}+step*${grow_rate_dia2}
variable new_z1 equal ${z1}+(${curr_dia2}-${start_dia2})/2
change_box all z final 0.0 ${new_z1} units box

if "${curr_dia2} > ${end_dia2}" then
"jump SELF done_growth"
else
"jump SELF loop_growth"
endif

label done_growth

Hallo,
I want to use custom/vtk to write my results, however I get the error: "invalid dump style".
How can this issue be resolved?
Best
kalei

Hello,
I am new to the field of simulation with LIGGGHTS. I have already done some tutorials and could already successfully import STL files here. I have a problem when importing a very large and complex geometry of a casting (many curves and different diameters).

Hi everyone,

I made a small Windows GUI tool that converts dump files from LIGGGHTS/CFDEM into VTK files you can open directly in ParaView. It’s called D2V (dump→VTK). Source and binaries are here:
https://github.com/opendemjapan/D2V-dump2vtk

What it does