LIGGGHTS® - User Forum

Hello,

I would like to track the time evolution of the number of clusters and the number of particles in each cluster during an impact simulation.

As a first step I use :

compute cluscoord all cluster/atom ${diam}

in order to identify the clusterID for each particle. However, I am wondering what would be the easiest way to count the number of clusters and the number of particles in each cluster.

Thanks in advance

I have been attempting to use superquadric particles in a cohesive system, but the documentation suggests that this combination is not supported in LIGGGHTS 3.8.0.

At the same time, the announcements section indicates that superquadric shapes are available in this version, which is somewhat confusing.

Currently, I am using the Easo capillary-viscous cohesion model. The simulation runs without any errors, but the results do not seem physically consistent, which makes me suspect that something may not be working as intended.

Hello
I am currently using LIGGGHTS-flexible fiber version
For my research needs, I have to make changes in the granular bond model (may be bond_gran2) such that it also incorporates elasto-plastic effects.
Unfortunately, I am not very fluent in C/C++ , however, I can code in python environment.
Is there a way that I can write my custom code code in python and run it with LIGGGHTS?

Can anyone please tell me the name of the contact search algorithm used in LIGGGHTS-Public?? and how contact search algo is implemented in LIGGGHTS?

Attached a ready build liggghts.exe with VTK 9.6 and Boost 1.90.0

Thanks to Christian: https://www.cfdem.com/forums/alternative-cmake-build-environment

Build with:
VS 18 2026
Cmake 4.3.1
VTK-9.6.1 (static-install, no additional installation of VTK required)
Boost 1.90.0 (for Superquadric)
MS-MPI (Installation of MS-MPI is required)

When running liggghts 3.8.0 on Ubuntu version 22.04.5, I entered the command "make auto" to generate the lmp_auto executable file
Error reminders keep appearing:

>>> WARNING <<<
Created MAKE/Makefile.user for the first time. Please check that the options in that file are set correctly.

Makefile:499: *** 'Could not compile and link a simple MPI example. Test was done with MPI_LIB='。 停止。
make[1]: 离开目录“/home/zhanghuixin/LIGGGHTS-PUBLIC-3.8.0/src/Obj_auto”
make: *** [Makefile:114：auto] 错误 2

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?