LIGGGHTS® - User Forum

Hello Liggghts users,

I have encountered on one problem that I currently can't solve.

I have a filled up cylinder with up-down motion. Riggle move/mesh feature was used for the movement of the cylinder.
Now the task is to track the particles in one exact part of that cylinder, which means that it needs to be moved at the exact same trajectory.

Riggle movement is not implemented in move command of the region. I tried to describe the movement with the movement of the region with rotate feature, but the problem is that I can't see if it is correct.

Hi guys,

I'm using insert/ stream to inject particles from a mesh. I want to make the injection velocity vary along time, like cyclic over time. Can anybody give me a hint on this?

Many thanks,
Jacob

Hello LIGGGHTS community. I am new to LIGGGHTS, having mostly used LAMMPS.

I am interested in incorporating radiation in DEM models for some phenomena where it is likely a large heat transfer mechanism.

I saw a 2013 presentation and seminar paper by Stefan Amberger, Christoph Kloss and Stefan Pirker on "Using Ray Tracing to Model Thermal Radiation in LIGGGHTS".

Hello all!

Hi Guys,

I am new to LIGGGHTS and struggling to create a free-moving mesh. Basically, I'm trying to create a mesh that moves and rotates under the effect of particle interactions and gravity. Is there a way to do this in LIGGGHTS? Any help would be greatly appreciated.

Thanks

Hello,

I have a planar x - wall which I want to represent with spherical particles. I wrote the following lines:

Hello People,

i am a newbie in the LIGGGHTS. I am trying to calculate kinetic energy of two movie particle of same material type. Two Particle has the diameters of 3 and 5 micrometer. I can't match the same value down there with hand calculation for KinEng.

Memory usage per processor = 1128.1 Mbytes
Step Atoms Volume KinEng
0 2 125001.5 0
1 2 125001.5 3979.3507
2 2 125001.5 3979.3507

Hello all,

I am a student who is very new to using LIGGGHTS, but I'm building a simulation of packed particle flow over a surface to study abrasion of that surface. Since the surface is uneven, the flow of particles isn't always laminar, and in some regions the particles may flow faster than in others. I'm wondering if anyone can tell me how to determine when the simulation has reached convergence - in other words, how do I determine how many timesteps are "enough?"

Hello!

I have a series of commands I would like to execute in an increasing fashion. For example:

1. [ Run 10 timesteps, set velocity of particles = 0 ] * 100
2. [ Run 100 timesteps, set velocity of particles = 0 ] * 100
3. [ Run 1000 timesteps, set velocity of particles = 0 ] * 100
4. [ Run 10000 timesteps, set velocity of particles = 0 ] * 100
etc.

Hello,

I have a LIGGGHTS model with a fix heat/gran/conduction. I want to output the conduction contact area information using the dump command. The following properties are mentioned in the online documentation - https://www.cfdem.com/media/DEM/docu/fix_heat_gran_conduction.html