LIGGGHTS® - User Forum

Hello everyone,

Hi Everyone,

I hope you're doing well. I’m facing a challenge in my simulation and would appreciate some help.

I have added two different walls to my simulation using the following code:
fix 1 all wall/gran model hertz tangential history mesh n_meshes 2 meshes bot_wall top_wall store_force yes

Now, I want to calculate the force on the top wall, but the results from the compute command contain forces from both the top and bottom walls:
compute 1 all wall/gran/local pos force id

Hi Everyone,

Could someone please help me with this challenge.
I am simulating the settling of particles in a periodic domain but notices that .liggghts files stops reporting any data once the particles gets to the bottom of the container. I am using an lbm-dem coupled code with liggghts version 3.1.0. The liggghts main input file is pasted below:

echo both
log ${dmp_dir}/log.liggghts

units si
atom_style ellipsoid # granular #
atom_modify map array

communicate single vel yes

boundary p p p
newton off

Hi All,

I am working on simulating superellipsoids particles free falling into a cylinderical tank. I am aware that spehere in the code are easily modeled. However, I am not sure how to model shapes other than shperes, such as superellipsoids. I am studying the packing configuration of different particles shapes using DEM solver. I would appreciate your suggestions and comments on this problem.

Thanks in advance !

Hello sir I am using LIGGGHTS for my project . In this project it is exactly same as the one that uploaded a yt video

Hi everyone,
For ParaView post-processing of multi-sphere models, how can each multi-sphere model be displayed as a fitted contour instead of a cluster of spheres

Hi all, I am a beginner using LIGGGHTS and I wanted to know if there's a way to compute the max local force acting on the mesh.

I tried using the mesh module stress, but I believe it only lets you know the overall force acting on the entire mesh. Is there no force module to find the max local force? For example, like the chute tutorial provides the stress acting at different points, is there no force equivalent?

Hello everyone,

I would like to install CFDEM coupling in our university cluster, but the compilation of LIGGGHTS with vtk has stuck me for several months.
Everytime I run 'cfdemComp', the error occurs:

Hi. I am looking to replicate a result from a published paper. The paper deals with powder compaction process under the influence of external force field. I can provide the modified LIGGGHTS library. I need help with the mesh and LIGGGHTS Script. I am willing to pay for the short-term project. If anyone is willing to help kindly shoot me an email to: onirbansen13@gmail.com

I have created a particle growth simulation in LIGGGHTS using fix command:
fix ID group-ID insert/pack seed seed_value distributiontemplate dist-ID general_keywords general_values pack_keywords pack_values ...

I want to shrink the same particle. The growth that has already happened, I want to undo the process overtime again.

I don't understand how to proceed it.