LIGGGHTS® - User Forum

I'm having issues with the restart and read_restart commands.

In my example simulation, I have a box filled with particles, which are then indented by a cylinder.

The simulation runs fine, and I have it output restart data at every 2000 timesteps.

When I attempt to restart from any of those files, the output from the new simulation shows ~1000 timesteps where the particles are spread through the domain, and fall to the bottom of the box:

Dear Sir,
I am new LIGGGHT user and i am trying to do a simulation in which we will pour the particles of different sizes but I am facing the following problems:

1. I can only see one type of particle in simulation whereas in input script i have used two different particles of different radius.

2.During running the input file the following warning is coming
"Less insertions than requested, the particle size distribution you wish may not be pictured".

Hello,

I downloaded the latest version of liggghts1.5.3. In the DOC folder I am not able to find the html file for insert/stream. Would you please help me finding it? Thanks.

Gautam

Hallo,

I'm wondering if there is a possibility to move a stl-file (which i included by the "fix mesh/gran/stressanalysis" command) in my simulation to a given position.

Hello experts,

I was trying to build CFDEM when I got stuck in LIGGGHTS installation part. I tried using different make files, I also edited MPI pathes, however, every time, I get this error about which I absolutely don't have any clue:

cfd_datacoupling_file.cpp:331:41:error: asleepa was not declared in this scope

Could any body please help?

Maryam

Hi all,
I know in LIGGGHTS 1 tria is like 11 particles, but I'm wondering if in LIGGGHTS there is a maximum number of Tria Elements or a Correlation between tria/particle size.
This because I run a case with particles size R=8-12 mm with a moving stl (num. elements = 36720, size = 2-5 mm) and when stl starts to touch particles it crashes with seg. fault!
(If I use a coarse / interm. stl mesh it works fine).

Another question regarding stl. Where is evaluated the momentum (Nm) on stl? Around the origin (0 0 0)? Is it possible to give to LIGGGHTS a different center of rotation?

Thanks

Hello everybody,

I'm a little bit confused about the doc of the fix property/global.

In the example the style-arg for atomtypepair "nCol" is set to 2 and the number of defaultvalues is 6, which are mapped into a matrix like
[1 2
3 4
5 6]

dear all,
I want to do a particle mixing test.
Is there any method that I can use to mark different particle groups, all the particle groups have the same material parameters, such as young modulus..possion rate...thermalconductivity and so on, the only difference is the label. (group 1, group 2.....)
For example, after all the particles accumulate in the bottom of the container, the upper half region was settled with label 1, and the lower group with label 2.
is it possible to deal this problem as similar to the temperature setting. the set command was used following a region command.

Hallo everybody,

while trying to build a quite simple simulation (basically some granular particles inserted in a cylindrical box) i get multiple warning messages: "Dangerous build in triangle neighbor list" when executing my simulation.

These warnings don't appear right at the beginning of simulation, but at a quite early stage.

Visualised in ParaView, it looks like this:

Hi,

Is it possible to define specific frictionless walls? (while certain walls and the particles among themselves have friction)

Thanks!