LIGGGHTS® - User Forum

I am Stephen and a beginner of LIGGGHTS. I am interested in simulating undrained cyclic triaxial test, but I am not finding the resources, could anyone please share them with me?

This is my e-mail address: akosah@tongji.edu.cn/akosah.as@gmail.com.

Thank you.

Kind regards,

Stephen.

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.

Dear all,
I am trying to set up a simple simulation with particles settling in stagnant water.
To run the simulations I need both in.liggghts_init and in.liggghts_resume. What is the role of these two scripts respectively.
If I change for instance the timestep or the dump in in.liggghts_init, it does not affect the simulation. It appears that the simulation is reading these settings from in.liggghts_resume. Are they then needed in in.liggghts_init.
Thank you in advance
Best regards
Bjarke

Hello all,

I would like to simulate growth and reduction of particles.
So, I insert particles on system I defined and relax the particles with hertz contact model and cohesion model.
After then, growth and reduction of particles start by using diameter change rates.
As a result, I could get the system volume change during the diameter changing.

Trying to install LIGGGHTS on ubuntu 22.04 with VTK version 7.1. I also checked the opnmpi version which is latest version

But I am facing the following error

Hello Liggghts users,

I have encountered on one problem that I currently can't solve.

I have a filled up cylinder with up-down motion. Riggle move/mesh feature was used for the movement of the cylinder.
Now the task is to track the particles in one exact part of that cylinder, which means that it needs to be moved at the exact same trajectory.

Riggle movement is not implemented in move command of the region. I tried to describe the movement with the movement of the region with rotate feature, but the problem is that I can't see if it is correct.

Hi guys,

I'm using insert/ stream to inject particles from a mesh. I want to make the injection velocity vary along time, like cyclic over time. Can anybody give me a hint on this?

Many thanks,
Jacob

Hello LIGGGHTS community. I am new to LIGGGHTS, having mostly used LAMMPS.

I am interested in incorporating radiation in DEM models for some phenomena where it is likely a large heat transfer mechanism.

I saw a 2013 presentation and seminar paper by Stefan Amberger, Christoph Kloss and Stefan Pirker on "Using Ray Tracing to Model Thermal Radiation in LIGGGHTS".

Hello all!

Hi Guys,

I am new to LIGGGHTS and struggling to create a free-moving mesh. Basically, I'm trying to create a mesh that moves and rotates under the effect of particle interactions and gravity. Is there a way to do this in LIGGGHTS? Any help would be greatly appreciated.

Thanks