LIGGGHTS® - User Forum

Hi,
As i am new to DEM simulation using liggghts ,

Based on bonded superquadric particle , we have developed a flexible film. Our objective is to make the flexible film as realistic as possible. For example I need to make a flexible film having properties as similar to a PVC film. Here I have 2 questions,

Hi all LIGGGHTS users,

I've encountered an issue with particles escaping out of the nozzle mesh wall. My aim for the simulation is to create a steady state powder flow out of the nozzle which i've uploaded the CAD file. I used ovito as the visualization tool and i noticed the no. of particles started decreasing as the powder flow hits the entry of the nozzle. After zooming, i saw a few particles flying out of the nozzle walls. Any idea how to avoid this? I assumed there is something wrong with my 'fix wall/gran' command.

Thanks in advance.

Hi, I am using some very wide grain size distributions (gsd). I have discretized the gsd as input to liggghts. I am using large prime numbers as seeds (which is a strange constrain) and all.

Hi everyone !

As my model requires to include DLVO Forces, I have to include pair_style yukawa/colloid into LIGGGHTS. For this reason I have followed previous Forum threads:
https://www.cfdem.com/forums/how-install-colloid-package
and
https://www.cfdem.com/forums/adding-new-force

Hello everyone,

I got a problem when I'm trying to couple palabos and liggghts as show below.

Dear community!
I'm trying to conduct the first part of triaxial test -confinig. For this I am moving 6 wall using stress/servo command. This wells shold be periodic.
Does anybody know what kind command should I use for periodic moved wall/mesh?

Below example from my script.

Fix x1 all mesh/surface/stress/servo file meshes/x1_conf.stl type 1 com 0. 0.00175 0.001 ctrlPV force axis 1. 0. 0. target_val 5.0 vel_max 0.05 kp 3

Hello everyone
I am doing a simulation to check the bulk density of the particles, which is filled in a box. I want to know the bulk density or mass of the particles within the box.
How can I do this?

I have a complicated geometry and I want to count the particle through any cross-sections (which is basically a plane).

I was thinking to define a plane (for example the "region" command can define a "plane") and then use this massflow/mesh command. I thought it should be straightforward.

Dear All users,

I am wondering if the fix-deform and superquadric are compatible, especially for remapping the particles when the domain starts to inflate or shrink.

Kind regards,
Lumb

Hi Everyone,

It is possible for someone to let me know, the procedure to calculate coordination number (CN) for superquads?. Presently, I am using the compute for spherical particles, which is giving very high values (expected but unsure of the procedure) of CN.

As there are possibilities of face to face contacts in superquads as opposed to only point to point contact in spheres, I am wondering how it is being accounted for in the calculation.

Very much appreciated,
Sounik