LIGGGHTS® - User Forum

Hi,
I want to use periodic boundaries in order to minimize simulation time. But I don't know how to get things done correctly.

I'm trying to set up a volume of particles, then move the particle with ID 1 to a position above the volume, change it's diameter and density, and let it drop. Problem is it disappears.

I make the volume separately (create.txt), and then in the main file that (drop.txt) that file is read in and I use the following:


...
run 10

set atom 1 x 0 y 0 z 0 vx 0 vy 0 vz 0
set atom 1 diameter 0.03
set atom 1 density 4865

run 60000

Can I define a column other than the sphere in the public domain of LIGGGHTS? If yes, how? Is the multisphere function for complex geometry available in LIGGGHTS?

Hi

I asm quite novel to LIGGGHTS and I created my first simulation. I only selected to create 500 particles with radius 10 mm.

I get this error when running the simulaiton : Error too many atoms sorting bins

cheers
michele

Hi

I asm quite novel to LIGGGHTS and I created my first simulation. I only selected to create 500 particles with radius 10 mm.

I get this error when running the simulaiton : Error too many atoms sorting bins

cheers
michele

Hi Chris,

I recently modified the original cfdemSolverPiso from PISO to PIMLE (merged PISO-SIMPLE) loop, i.e. supporting adjustable timestep for CFD solver. It helps speeding up the calculation when CFD domain contains millions of cells.

In priciple the new CFD-DEM solver works fine, and if the CFD "adjustTimeStep" option is turned off, the solver is more or less same to the original one. However, there are some remaining issues:

"LIGGGHTS INSTALLATION GUIDE FOR UBUNTU 12.04 LTS, 13.04 LTS, 14.04 LTS, 15.10, LTS 16*, LTS 18*"
NOTES: 1. This documentation was written long back since when several changes have been made by LIGGGHTS developers that made the installation relatively easy. However, to have backward compatibility those outdated instructions for installation are still available but are deprecated with special notes.

Hi,
Do you know what is the appropriate pair_style for sand or shale or clay simulation?

Thank you for the response in advance.

Sincerely,
Rasoul

thread can be deleted
// used an old liggghts version.

Hello,

I'm a student from Germany and a newbie in using Liggghts.
I'm trying to import a STL-File from a CAD-Software and I get the following error:

Reading STL file 'behaelterNX.stl'
Setting up run ...
ERROR: Mesh error: dimensions too small - use different unit system (multi_node_mesh_parallel_I.h:536)

I have no idea what's wrong with my code or with my STL file and I hope that I get some help here in this forum.
During the simulation several particles should fall into a container and later I want the container to move.