LIGGGHTS® - User Forum

Hello,
I am trying to simulate the ANSI/ASAE S424.1 test. This uses a crank to wiggle and move screens.

I have the following movements
variable per2 equal 1./5 # 2.4
fix mv_box1 all move/mesh mesh BotShear riggle origin 0.125 0.0625 0. axis 0. 0. 1. period ${per2} amplitude 5
fix mv_box2 all move/mesh mesh BotShear viblin axis 1. 0. 0. order 1 amplitude 0.015625 phase ${phase} period ${per2}

Right now I am testing with with a shear box geometry to figure out the commands...

I am experiencing it "walking" in the negative y direction.

Hi

I need to find particles that contact with each particle in each time step as a list in my dump file.
Is there any compute syntax that can give me this array as an output?

Best regards

Hi,

Just beginning with LIGGGHTS, and I met a problem when I compile it.
The error information and the screenshot are attached. Is there anyone who could help me solve this problem?

Hello

Hi,
I'm pretty new to LIGGGHTS and I'm trying to incorporate heat transfer from an intruder placed within a granular system and the grains themselves.
The intruder is a simple creation and just made of a set of particles stuck together. So far I've only been able to set these particles that make up the intruder to an initial temperature that then cools as the heat dissipates into the surrounding granular bulk. But I want to fix the temperature of the intruder so that it remains at a constant temperature to assess how it dissipates heat through the granular bulk over time.

Hi!

Im using a contact model that does not include viscoelastic damping for normal contact (Thornton&Ning). I would like to be able to turn on contact damping. Is there some fix or way of adding viscoelastic contact damping or should I go into the code and implement it?

Thank you!

BR
Per

Hello all,

A segmentation error occurs in the calculation of cohesive particles.

There is already a topic, but I couldn't solve it, so please advise.

Is it possible to dump the LIGGGHTS output files into the vtm, pvd format?
I think pvd used for the summarizing the time step information and vtm used for dumping the data into some particular post folder

Thank you

How to give mass, the moment of inertia to the mesh file while importing it to the LIGGGHTS scripts. I considering mesh file as rigid body ?

Thank you

I recently installed LIGGGHTS on Ubuntu and run the example simulation.Then i wanted to run my own simulation so i created the 3D model and wrote the script using the LIGGGHTS official Documentation but when i am running it it is giving me a error:

"ERROR:Could not find fix group ID(../modify.cpp:782)"

My script is:-

# Preliminaries
units si
atom_style sphere
atom_modify map array
boundary f f f
newton off
communicate single vel yes
#processors 2 2 3