LIGGGHTS® - User Forum

Hi, hope you're all doing well.

It is very common to have many variables defined throughout the input code in LIGGGHTS. Is there a way I could create a file named "variables.txt", assign all my variables in this text file, and then read it within my input code?

Thanks in advance.

Hi,

Hi Guys

Has anyone had issues installing LIGGGHTS on Ubuntu 24.04 LTS?

My installation seems to go okay however there is an error wit regard to vtk which prevents any simulation from running. Refer to the error below.

./lmp_auto: error while loading shared libraries: libvtkCommonCore-8.0.so.1: cannot open shared object file: No such file or directory

I have tried compiling vtk separately however the issue persists. Noting that I have done the same installation on the Raspberry Pi5 running Ubuntu without any issues.

I am trying to install LIGGGHTS on a HPC and I got the following error
Creating list of contact models completed
make[1]: Entering directory'/home1/10176/padesina/LIGGGHTS-PUBLIC/src/0bj_auto'
Makefile:945: *** 'Could not determine suitable appendix of VTK library with VTK_INC="-I/home1/10176/padesina/vtk/source/build/include", VTK_LIB="-L/home1/10176/padesina/vtk/source/build/lib64/" and VTK_APPENDIX="-vtk-9.3"'. Stop.
I noticed LIGGGHTS cannot find the "vtkVersion.h" file as in the attached make_auto.log file. Any ideas on what to do will be appreciated.

Hi Guys

I believe that it should be possible to compile LIGGGHTS to use the GPU by modifying the makefile and using the Kokkos library.
Has anyone managed to do this as yet?

Hello everybody,

Hi everyone,

I was using LIGGGHTS_PFM for a while, and after that, I realized that using LIGGGHTS-WITH-BONDS, based on Potyondy and Cundall's paper, is better for my simulations. I used the same model for an uniaxial compression test, which had no errors in LIGGGHTS_PFM, as input in LIGGGHTS-WITH-BONDS, but it cannot correctly calculate the average stress and strain. Despite the fact that those commands were original LIGGGHTS' commands, not specified only in PFM, can someone help me with this matter? I will attach the parts of the code that LIGGGHTS-WITH-BONDS cannot recognize.

Hi Guys

We are currently using LIGGGHTS to perform DEM analysis on a trouser chute for a bulk materials handling application.
I am familiar with using LIGGGHTS from an academic standpoint and I am able to use the software.

We currently have a test report, please refer to the attached image regarding the contents.
Does anyone have advice for using the test data to calculate input parameters for the DEM simulation?

Hello everyone,

I was using for a project the bond package (LIGGGHTS_FLEXIBLE_FIBERS) and I was trying to write out the number of bonds in a specific region of the domain. Does anybody know how one could do that?

With "thermo_style numbonds" one can print the number of bounds in the whole domain to the screen. However, when i try to assign numbonds keyword to some variable it does not work. It gives a completely different float number. Eventhough it works fine with other thermo_style keywords like "step" for example.

And when i try with:

Hello everyone, I am a beginner in LIGGGHTS. I encountered the following error and hope you can help me resolve it.
The Error is Atom sorting has bin size = 0.0 (../atom.cpp:1438)
I try so many times for the bin size, but it doesnt work.
# LIGGGHTS input script for a ball falling onto sand

# Initialization
units si
atom_style granular

# Create simulation box
boundary f f f
newton off

region box block 0 0.1 0 0.1 0 0.1
create_box 2 box