LIGGGHTS® - User Forum

Hello everyone,

I am looking for opinions or insights on the capabilities of LIGGGHTS to model fine particles/powders. Has anyone developed or worked with models involving the phenomena (cohesion, van der waals, etc) that arises from considering fine particles?

Any comments on this topic will be of help since I am no expert on the subject.

Thanks,
Eng. Nicolas Alderete

Can LIGGGHTS run on any cloud service such as Amazon EC2?

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Edit by Arno Mayrhofer: Please do not follow this outdated guide.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?