LIGGGHTS® - User Forum

I am using LIGGGHTS for radial segregation problem in rotating drum. I took examples of the scripts available in the LIGGGHTS tutorials and other places but I am not able to execute the segregation problem.
It would be very helpful if somebody expert in the field could provide me an example script for segregation problem in rotating drum. Thank you.

Hi,

I'm new to DEM simulation using LIGGGHTS and I've got to simulate a transfer chute with conveyor belt. Using the "Conveyor" tutorial in the LIGGGHTS examples folder I have been able to set up my own simulation succesfully.

However, as I reviewed the results in ParaView I saw that the velocity of the particles in the conveyor belt was actually different to that of the conveyor belt itself. As soon as I detected this I decided to re-run the "Conveyor" tutorial and check the particle velocity against the conveyor belt and, as it turns out, they were also different.

Hello
I am executing the tutorial example problems and viewing simulation results in Paraview, but I am not understanding how to analyse and draw the conslusions from those results.

Hi all,
Does someone know how model the movement of a planetary ball mill in the LIGGGHTS script? The pot is doing a rotational / translation motion.

thanks a lot

Hi everybody,

The visualisation of force chain networks is a great thing.
According to the release notes, the above mentioned dump commands were included into liggghts 3.4. I installed L 3.4.1.

But when i use them, i always get the message that those are invalid dump styles. I am wondering if someone can give me a hint what is wrong.

Is there more information regarding this new addition?

I have been using the dump2force python script for force-chain visualisation, but it has some drawbacks.

A quick example for the new functionality would be great.

Cheers,
-A

Hello all,

Heat transfer between two particles is calculated by fix heat/gran

If i want to know how the heat transfer does in liggghts, which cpp should i see ?

Could you give me some advices?

Im trying to insert particle into a cylindrical container and apply axial load on it over the top plate. But it is showing error
ERROR: Fix wall/gran (id geometry): More than one wall of type 'mesh' is not supported (/build/buildd/liggghts-3.0.3+repack/src/fix_wall_gran.cpp:505)

# Shear Cell example
### Initialization
# Preliminaries
units si
atom_style sphere
boundary f f f
newton off
communicate single vel yes
#processors 2 2 2

Dear community,

I am trying to understand the formula in the description of the gran Hertz model. Here is the question, do the Sn and St parameters have any physical meaning? Or they are just introduced for the sake of simplicity of the formula? And the second question: is it right that the gamma depends on the 1/4 power of the overlap?

Any reference for the formula origin are welcome? because the references in the manual do not contain it.

Thank you,
Oksana

Dear All

I have problem when I insert particles.
When I insert particle in cylindrical vessel, the particles stand like a pile.
How I can insert particles which the surface of particles will be flat.

I use below command to insert particles:
fix ins all insert/pack seed 1001 distributiontemplate pdd1 insert_every once overlapcheck yes particles_in_region 15000 region insert_reg

Best Regards
Esmaeil