LIGGGHTS® - User Forum

Hello,

Hi Guys

If one has a vibrating screen deck, is it possible to assign multiple types of motion to the deck?
For example rotation and translational motion. The data for the accelerations and displacements will be calculated by means of differential equations, thus these will be used as input data.

Kind regards
Mishal Mohanlal

Hi Folks,
I am trying to delete the atoms after they reach a certain point, is there any kind of compute available for that? I am just using 1 type of particles for my simulation. I want them to be removed and not be tracked anymore.

Hello,

I am trying to do simulation with two different particles at once.
So my first simulation will include particles differe in their cofficient of restitution,

This is my script
```
#Simple chute wear test

I used the 'fix multisphere/break' feature for a simple direct shear simulation on clusters. After breakage occurs, I would soon receive error message telling me that there is problem with MPI all_reduce. The simulation went well when I used 'fix multisphere' instead. I don't have any idea what went wrong with it.

As we know, the following code can get the component of the contact force:

compute 1 all pair/gran/local force

but, how to get the magnitude of the contact force?

Thank you for your help.

Hi everyone,
I hope you are all well.
I have a question about Liggghts ability to fix the particles in their position but update their velocities. We know liggghts has the following command:
fix 3 wall nve/noforce
which does the opposite thing I need, changing particles position but fixing their velocity. I need to keep the particles in their initial position, but update their velocities based on forces. Now I am using the following command:
fix integr all nve/sphere

Hello all,
Is the Hertz model given in model same as Hertz Mindlin?

Kindly let me know.

Regards,
Tarun

Hello,

briefly about my problem, i have a cylinder where i fill particles and move this cylinder to mix the particles. I quickly notice that even with small numbers of particles (about 10,000) it takes a long time to simulate. To better see where the most time is spent I ran the script with modify_timing verbose.

Hi everyone I am new to LIGGGHTS and I am getting for scale factor 10 particle position x,y,z 10 times bigger and for scale factor 100 position 100 times bigger compared to Scale factor 1. It is obvious. But I want dump files again to scale factor 1 from 10 or 100. I think that dump_modify is not suitable for dump custom command. I am also uploading pictures of dump files for factor 1, factor 10, and factor 100. If anyone has an Idea about that it is very useful for me and I will be very thankful if you can share it with me. Thanks in advance.