LIGGGHTS® - User Forum

Dear all,
I want to bond several particles into a whole, then give it a horizontal velocity in granular system and observe its vertical movement. May it be possible with LIGGGHTS?
Best Regards

Hello everyone,When I used processor 2 2 1,I found it spend more time than one CPU,What can be the reason for this? Does anyone know?

Hello everyone~

Issure (I):
Thanks very much for your tutorial. Appreciated. However, when I use the command " dump dumpnetwork all local/gran/VTK 200 post/dump*.vtk " to export the local contact information and to convert it into .VTK for paraview analysis, it shows the error as entitled. I am wondering:
(1) Did I use the wrong command (e.g. lack arguments)?
(2) or the VTK is not supported when compiling.

Any can help me?

This is the log of erro: http://paste.ubuntu.com/24329836/
(see FATAL ERRO)

I was using the VTK 7.1.1. If this helps: https://github.com/vejmarie/vtk-7/tree/master/Parallel/MPI

Hi all, I am totally new in liggghts...

Until now I worked on tutorials and made necessary changes on them to get worked it...

Right now I want to do something on my own...so I modeled simply box in SolidWorks export as ASCII .STL file and when I import geometry in to liggghts I am getting this message:

"Created orthogonal box = (-0.01 -0.06 -1.22) to (0.51 0.01 0.01)
1 by 1 by 1 MPI processor grid
ERROR on proc 0: Cannot open mesh file /meshes/ohisje.stl (../input_mesh_tri.cpp:105)
(../input_mesh_tri.cpp:105)"

Hi all,

Edit by Arno Mayrhofer: Please do not follow this outdated guide. Instead see the last post in this thread for details.

Hi

May someone assist me on how to extract shear force from a moving wall relative to a static mass of granular materials which are loaded with a normal force.

What options are available for relaxing a multisphere system? My favorite fix option is nve/limit, but this only works for regular spheres. And I'm running simulations in parallel, so inserting over 100,000 multisphere particles has been very difficult if I use the 'overlap_check yes' option. I'd also prefer to keep my domain as compact as possible, so I want to avoid inserting particles from a very tall height. If there is nothing freely available, does anyone have any recommended code modifications I can implement?

Hi all,

Hi all. I am currently doing a simulation that takes dump files of a 1.5 million particle granular slide every 2000 timesteps. Each ascii .vtk file takes up about 150 MB and the granular slide concludes in about 5000000 timesteps; i.e. the final file size of the dataset is roughly 375 GB. I am looking for ways to reduce this filesize while preserving the same data as each save interval corresponds to a frame in my laboratory recording video. Is there any way for LIGGGHTS to dump into a compressed folder for instance, and how much space would that save?