LIGGGHTS® - User Forum

Hi all,

I'm trying to use langevin thermostat which is described in below link of liggghts:
http://www.cfdem.com/media/DEM/docu/fix_langevin.html

I use LIGGGHTS (Version LIGGGHTS-PUBLIC 3.3.0, compiled 2015-12-14-18:26:11) version of liggghts, but i got this error:
ERROR: Invalid fix style: "langevin" (../modify.cpp:820)

is this command supported by mentioned version of liggghts !??

Thanks in Advance,

Reza

Hi,

Recently, we were able to work in a cluster. Specifically it's a Stack IQ cluster, and we have some troubles with the mpirun command in order to use all the processors. My doubt is how is it work LIGGGHTS with a STACK IQ cluster?,is there a problem with his architecture?

Thanks and cheers

Nicolas.

I want to rotate a cylinder on its own axis at 3000 rpm as well as the origin (0,0) at 200 rpm. I am using move/mesh for this purpose. I am only able to rotate either on the local origin or on (0,0). I am unable to specify two rotations at the same time. Please let me know how to do this as in the manual it says it is possible to specify two rotations on a mesh. I would grately appreciate any help.

The code I am using is:
fix movecad all move/mesh/gran rotate 0.0 0.0 0.0 0.0 0.0 1.0 0.03 cad1

Hi all,

In the following paper:
Surface Energy and the Contact of Elastic Solids, Author(s): K. L. Johnson, K. Kendall and A. D. Roberts, Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 324, No. 1558 (Sep. 8, 1971), pp. 301-313

The cohesive energy density is mentioned in J/m2 but in LIGGGHTS we have to use the same in J/m3. So, can anyone elaborate the conversion method for cohesive energy density.

Thanks in advance.

Hello, everyone.
I'm a new user of LIGGGHTS and now I'm trying to run tutorial and examples.

All the examples work fine, except of contactModels/in.oldModels.
The error is: ERROR: Invalid pair style (../force.cpp:244)
The online tutorial examples also give me an error:
ERROR: Invalid fix style: "wall/gran/hertz/history" (../modify.cpp:820)

I guess it is because in both cases the

pair_style gran/hertz/history

is used. And my LIGGHTS cannot recognise it.

Hello,
I am receiving the following error when running the hopper drain example from the website.

mschramm@da200b-04 ~/Documents/liggghts/examples/LIGGGHTS/Tutorials_public/Bin_Sim
$ Liggghts<HopDrain_Bonds.txt
LIGGGHTS (Version LIGGGHTS-PUBLIC 3.3.0, compiled 2015-12-11-19:39:06 by mschramm, git commit 9b1fc57b77c483deaf2c0a6c69241c5d4f91e3c2 based on LAMMPS 23 Nov 2013)
ERROR: Invalid atom style (../atom.cpp:432)

I have been able to run the example using atom_style sphere but I now want to add a bond between two particles.

Hello,
I am receiving the following error when running the hopper drain example from the website.

mschramm@da200b-04 ~/Documents/liggghts/examples/LIGGGHTS/Tutorials_public/Bin_Sim
$ Liggghts

Hi,

I want to know, How to insert particles in triclinic box. Have any body tried dem simulation with triclinic box in LIGGGHTS?

Regards,

Manoj

I use the following command to output mesh data:
"dump dumpmesh all mesh/vtk 1000 post/dump*.vtk id stresscomponents mysurface";
I konw that VTK is good for paraview. But the data in VTK is not easy to use for quantitative analysis.
for granulars, I can output particles data using the following command, and it is easy to do post process for quantitative analysis.
"dump dmp all custom 1000 post/dump*.particles id type x y z vx vy vz fx fy fz";

Is it possible to simulate a tank sloshing with moving walls?. I can not find a way to move walls when using SPH

Regards

Danilo