LIGGGHTS® - User Forum

Hi all,
I looked in manual and found "partition" command for dividing the total area into multiple partitions, each partition is assigned a different number processors. But I could not exactly understand how? If anyone knows, please tell me how!

Regards
Elham

I have to write a script that generates a cylindrical container (radius 12.5 mm and height 150 mm) filled with a random packing of 500 glass spheres having the same radius (for example 1 mm).
I am interested only in obtaining the spatial coordinates (x,y,z) of the spheres after running the simulation.
How could I write this script?

Hi, All

I am trying to use the servo controlled wall (shear cell example in http://www.cfdem.com/forums/liggghts-tutorial) in LIGGGHTS 3.2.0 (the latest), there is always an error for the below lines (line 66-69), the file is attached:

fix cad3 all mesh/surface/stress/servo file top_plate.stl type 1 scale 0.001 &
stress on com 0 0 0.06 dim z ctrlPV force target_val -10.0 vel_max 1.0
fix geometry2 all wall/gran model hertz tangential history mesh n_meshes 1 meshes cad3

Dear all,
Could someone tell me how to show the width of the lines corresponding to the magnitude of the force chains in paraview? Thanks a lot!

Jian

I am starting out with LIGGGHTS and would appreciate if anyone could take time to review the code that I have written for simulation. There is no error with it. The simulation has been running for last 14 hours and is on 61000 step as of now. I was just wondering if this is efficient way of doing it or it could be made better?

Thanks
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Hi all,

I am going to insert particles in a box as follows, but this take too much time ( about 10 days with 120 cores)!
I would be pleased if anyone knows why!

--------------------------------------------------------------------------my input----------------------------------------------------------------
# insert granular particles into channel

echo both

atom_style granular
atom_modify map array
communicate single vel yes

boundary f f f
newton off
units si

Hi,

I cannot manage to give different properties to walls. in my simulations walls and particles are of two different materials.
I tried to assign different group ID to boundaries and particles but I get a command error which I don't find it.

Thanks
Mohammad

Hello! everyone. I have just started looking into LIGGGHTS for DEM simulation for my project.
Can anyone please help me with some resources to start with? I am kind of stuck. I'm not sure whether the software is installed or not. This is my first experience with a linux operating system. I was looking at the tutorials. But I could not understand how to run them. Where to write the code? How to begin with?

Any kind of help would be greatly appreciated.

Hi,

I was thinking about the packing due to gravity drop in an annular region. I used the pour command and got the particles in to a cylindrical region. But Iam not able to delete atoms in a new small cylindrical region inside the first cylindrical region to create annular region. The input command is like this

### Initialization
# Preliminaries
units si
atom_style sphere
atom_modify map array
boundary f f f
newton off
communicate single vel yes

# Declare domain

Dear all

Could you please let me know, where we can find stl files to run the benchmark examples given in the website (LIGGGHTS_Benchamrking)

There are several input files for batch processes and some continuous processes.

It would be good help for the beginners to run those becnhamraking problems and understand LIGGGHTS better

Thank you
Best Regards
Anki