LIGGGHTS® - User Forum

Hello all,

I have modified LIGGGHTS with a custom fix, that modifies a per-particle scalar variable.
You can think of particles interacting with spacially varying radiation, where it is of interest, how much radiation dose each particle "collects".
To access per-particle properties has been easy, however, i needed an extra variable to store the radiation dose each particle gets.
The documentation suggests to create this via the fix property/atom as

Hello,

I try to mix sphere particles and multisphere particles in the rotray drum. The multisphere is consist of two adjacent spheres.

But in the simulation, some particles move strangely, which makes the rusults unreliable. When the drum starts rotating, an "explosion" occurs as shown in the attachment picture 1, 2 and 3. And during rotating, some paricles suddenly jump from the middle of the particle bed as shown in picture 4.

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