LIGGGHTS® - User Forum

ERROR: Invalid atom style (/build/liggghts-YO7u74/liggghts-3.8.0+repack1/src/atom.cpp:459)
I an trying to use Superquadric particles but I am unable to use even though I enabled it in make file and recompiled the code. Can anyone please tell why does the error pops up?

Hello all,
I am Tarun from India. I wanted to install Aspherix basic in my system. But, while purchasing, I noticed that there is no option for "India" in the "Region" drop-down. Thus, I could not buy it. Can anyone please help me with this???

I really appreciate any help you can provide.

Regards,
Tarun

Hello Community,

I have a question regarding the implementation of the contact models. Like I understand and has been discussed allready in the forum Liggghts follows the integral implementation of the spring force according Di Renzo and Di Margio. Thats fine. I am more unsure about the implementation of the damping force and the coulomb criterion.

Like i understood from literature there are 2 ways:

1) First check tangential spring forces for coloumb considering the normal spring force and than add the damper afterwards in both cases if necessary:

Hello,

Does LIGGGHTS have the linear spring-dashpot contact model? If not, how can it be implemented?

Hello everyone,

I have installed LIGGGHTS successfully by the file 'makefile.auto' in source. And I can successfully run the examples provided in the examples/LIGGGHTS/Tutorials_public such as the chute_wear by the command 'lmp_auto < in.chute_wear'. But for some reasons I'd like to build LIGGGHTS as a shared library. Having done this, when I tapped 'lmp_auto' in the terminal, it got error as 'bash: lmp_auto: command not found'. However, command 'python chute_wear.py in.chute_wear' ran with no errors, where 'chute_wear.py' is a file shown as follows

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