LIGGGHTS® - User Forum

Hi there, I was wondering if there was a way of having a region of velocity in liggghts. The issue here, is that I can't simply assign the particles in the region to a group and then give a velocity to that group, as particles will be regularly entering and exiting the region in my simulation. I don't think theres a way to constantly recalculate the group is there?

Hi, I am working with superquadrics in the LIGGGHTS library.

I have compiled the library, with superquadrics enabled, and I do receive results.
In particular, I am investigating the narrow/broad phase contact detection discussed in here: https://link.springer.com/article/10.1007/s40571-016-0131-6

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: