LIGGGHTS® - User Forum

Hello everybody,

I want to simulate particles glued to a wall. Is there a way how I can completely restrict rolling (so that omega=0) for these particles? Translation should still be allowed, as the mesh moves horizontally via the viblin command.

My approach so far is to set the rolling friction and wall friction values extremely high (I used a value of 1000); however, omega still is not zero. I also used a cohesion model, but the particles still rotate a little. Does anybody have another idea?

Hi,
I am currently facing a problem with liggghts hopefully someone can help me.

I need to identify or separate particles which are not part of a heap. Therefore, I would like to delete particle without a neighbor.
Is it possible to extract this information from the neighbor list? How can I do this?

Regards,

Alexander

Hi,

I was running a simulation which takes a lot of time, but didn't put any lines to save the restart files.

But the simulation stops because storage of my machine becomes full.

Is there any way to restart the simulation with my dump files?

Any recommendations will be welcomed :D

Hello All,

We know that in OpenFOAM/system/controlDict, we can set the writeInterval, eg., 0.1 and my end time is 500. I can also set purgeWrite to be 6, then it will only store the latest 6 writeInterval steps, eg. 400.1, 400.2, 400.3, 400.4, 400.5, 400.6 if my simulation has run for 400.6667.

I am wondering whether the restart command in liggghts has the similar functionality.

Thanks and best regards,
Min

In the simulation I need particle A to remain in the main simulation box A while particle B will travel through the wall of simulation box A into box B at a random location based on the packing depth of particle A.

Hi colleagues,

I want to ask is there any method to delete particles with a certain diameter. In my simulation, I have the particles with diameter ranging from 1 mm to 10 mm, now I want to delete the smallest particles with d=1mm. I have sought the command "delete_atoms group" while found I con not define a group with a certain diameter. How could I delete the smallest particles? Could anyone give me any clues? Thanks.

With regards,
Zheng

Hi all,

Dear all,
How do I install LIGGGHTS version 3.1.0? I need to use the SEAICE user package which was written for LIGGGHTS 3.1.0. I want to simulate wind blowing the sand away from a sand dune.. causing avalanche etc.

Hi,
I'm interested in using the Thornton Ning contact model that was implemented in release 3.8.0 in LIGGGHTS. I also read in the release post that "currently there is no doc yet, this will hopefully be in the next release.". Is there anywhere I can read about the implementation of the contact model?

I am trying to use LIGGGHTS to model bricks in a masonry structure. I am using the superquadric particle template with blockiness parameters of 4.0 and axes lengths of half length, height, and width. This works fine for regular walls where bricks have a parallel arrangement.

However, I would like to be able to model arches and other curved structures, as well. In these cases, the super quadric needs to be inserted at an angle. I do not see a way to do this in the documentation (linked below). Does LIGGGHTS support this functionality?