LIGGGHTS® - User Forum

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

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Hello, I’m a graduate student who has just started working with LIGGGHTS.