LIGGGHTS® - User Forum

Hello mates,

Is there any paraview plugin for the LIGGGHTS_Flexible_Fibers available for newer paraviews? The one from Richti83 is for the Paraview 5.8.1 which is apparently too old for our IT-dept. in the company (only 4 years old bullshit). They are ignoring to download the one from Richti83:

https://github.com/richti83/ParaView_Reader_for_LIGGGHTS/tree/master/pre...

Any hint would be highly appreciated. Thanks in advance

HI,

I'm trying to implement a rigid body dynamics problem in LIGGGHTS. I am using variables as inputs for the fix move/mesh commands. For the linear/variable style there's no problem, however, the rotate variable style only accepts variables as inputs for the angular velocity omega. I would like to also use variables for the inputs of the origin and axis arguments. Is there a way of doing this?

Thanks for your help.

Best regards.
Miguel

Hello,

I want to use spheres and one superquadric (cylinder) in my simulation. However, it turned out to be illegal when I tried using two types of atom (atom_style granular; atom_style superquadric).

I know I can still use superquadrics to represent sphere (just set both "blockiness" as 2), but, in this case, the rotation is not updated and the angular velocity is always 0.

I use nve/superquadric (scheme 1) for integration:

fix integ bed nve/superquadric integration_scheme 1

So, how should I deal with either problems?

Thanks

Hello, everyone,

I have been working on a simulation that involves the random compaction through uniaxial pressing of particles with varying size distributions, using two different material types to create a composite. Up to this point, the process and simulations have been straightforward, and LIGGGHTS has been an invaluable tool.

Hello,

I am currently facing challenges in resuming a simulation that involves superquadric particles formed by gravitational settling.

1. My initial approach was to utilize the "read_restart" command in a subsequent script file. Unfortunately, this method does not allow for resizing the simulation box with the "change_box" command.

2. My second attempt involved the "write_data" and "read_data" commands. However, I discovered that these commands do not support superquadric particles.

Hi everyone,

I'm very new to LIGGGHTS, and I'm having troubles to create a simple simulation.

As a starter, I want to create a simulation where a single particle (metal particle) is settling in air and another simulation where a single particle is settling in viscous medium (like a resin).
When a particle falls in air, I just want to have force of gravity acting downwards on a particle.
When a particle falls in a viscous medium, I want to have drag force acting upwards on a particle, while force of gravity acting downwards on a particle.

Hi Everyone,

I am analyzing a sieve geometry for particle transfer. The CAD model of sieve plate is complicate with around 1 Mio. of tessellated faces. Hence, reading and "import and parallelization" of this taking huge amount of time. Is there any alternate way to speed up this time? I can't use the recently introduced model "massflow/mesh/sieve" fix command because most of modelling data require here is unknown.
I also tried converting the STL file to VTK using Paraview tool but it also did not work.
Any suggestion that I can try?

Regards

Hi everyone,

I am trying to simulate a rock under point load, similar to what is described in the LIGGGHTS-WITH-BONDS documentation in.bond. My model consists of different clusters, and I intend to start with two types of atoms (type 1 and type 2) that are randomly distributed within the model. Additionally, I want to define three types of bonds: bond1 between atom type 1 and atom type 1, bond2 between atom type 2 and atom type 2, and bond3 between atom type 1 and atom type 2. I have a couple of questions:

Hi everyone,

I am somehow a beginner in using LIGGGHTS, and I want to make a model consisting of different clusters using LIGGGHTS-WITH-BONDS. I aim to create a model with two different types of bond properties (stiffness and normal and shear bonds), and I want to assign atom bond type 1 to some atoms and atom bond type 2 to others. Is it possible with LIGGGHTS-WITH-BONDS? And is there any example that can help me?

Thank you Tannaz

Hello!

I am using LIGGGHTS FLEXIBLE FIBERS. I made flexible fiber from 50 atoms bonded togeather. I am cutting this fiber by blade and determing loads on blade. I want to make a fiber, which would better describe shape of real fiber so I let atoms overlap, which means I had to turn off pairwise forces. I did that by command neigh modify exclude (with this command I turn off creating list of neigh atoms). But when I use this command forces which were applied by command bond style also disapear.