LIGGGHTS® - User Forum

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

Hi all!

I have encountered the following problem with the energy equation in my simulation:

I am running the simulation with a constant particle temperature (for testing purposes). At a certain point, I get some "Not a Number" (nan) errors. The simulation goes on smoothly because the governing equations of movement are not affacted, it's just not possible to postprocess the temperature and heat transfer of the particles because the arrays are corrupted.

The thermo output looks like that when the error occurs:

Hi all.

I'm trying to install the voro++ package in order to enable computation of voronoi volumes of particles. However, the link for the source code provided on the LIGGGHTS documentation page seems to be broken (http://math.lbl.gov/voro++/download). Please tell me where I can find the source code.

Thanks.

Joel

Hi,

I am facing problem of particles passing through wall. I am simulating case where, particles are rotated in a container using rotating impeller. This impeller (rotating wall) is very close (5mm) to the stationary wall of container. There are two types are particles (with 1.5mm diameter and with 7mm).

When impeller is rotated, particles pass through wall. Smaller particles escape through wall more than larger particles.