LIGGGHTS® - User Forum

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?

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,