LIGGGHTS® - User Forum

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

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Hi

I have tried simulating particle breakage (a clump in this case) based on a previous discussion available on the forum. Following is the my MWE and the error message.

atom_style sphere
atom_modify map array sort 0 0
boundary m m m
newton off

communicate single vel yes

#PUBLIC version only supports serial execution
processors 1 1 1

units si

region reg block -0.3 0.3 -0.3 0.3 0. 0.5 units box
create_box 1 reg

neighbor 0.004 bin
neigh_modify delay 0

I am currently trying to model a static screw auger. I have successfully imported my STL files for the relavent geometry, however in my sims, I havent had any luck getting the particles to interact with the rotating geometry. The box.stl and auger.stl are static bodies, and the drum.stl is meant to rotate. Here is the current code snippet:
# New pair style
pair_style gran model hertz tangential history # Hertzian without cohesion
pair_coeff * *

timestep 0.00001

fix gravi all gravity 9.81 vector 0.0 -1.0 0.0 # Gravity along the Y-axis