LIGGGHTS® - User Forum

Hi guys,

I am setting up a test case with a sand particle colliding into a sand bed. When I do small particles, I got the error saying that volume expectancy was too small. I want to have a mix of 100 micrometer and 10 micrometer particles. It seems there is a limit set in the particle template code.
What is the minimum diameter for particles that LIGGGHTS can handle? If I want to do smaller particles, can I scale gravity and other coefficients to overcome the limit?
There was a similar topic before:

node/493

Does anyone know what this error means?

"ERROR: Domain too large for neighbor bins"

If I have a mesh indenter, and want to visualise which particles it has contacted, is there an easy flag that can be set in the input file?

I'm assuming that I haven't seen one in the documentation because it isn't that simple (rather than having just missed it!). If so, anyone have any ideas for implementing this?

This is basically a continuation of my last thread with this title. I updated to v 2.2 and my simulation no longer freezes. However, my simulation now runs as if my granwalls aren't there. My .stl dumps look correct, but looking at .jpg dumps (and even just the number of particles in the simulation region), you can see that the particles just fall straight down and out of the region, without interacting in any way.

warning messages:


Setting up run ...
175 mesh elements have high aspect ratio (angle < 0.500000 °)
WARNING: Mesh contains highly skewed element (multi_node_mesh_parallel_I.h:513)
Import and parallelization of mesh cad containing 1448 triangle(s) successful
149 mesh elements have high aspect ratio (angle < 0.500000 °)
WARNING: Mesh contains highly skewed element (multi_node_mesh_parallel_I.h:513)
Import and parallelization of mesh cad2 containing 10288 triangle(s) successful
INFO: Resetting random generator for region bc
Memory usage per processor = 11.1755 Mbytes


Hi, all.
I'm new to LIGGGHTS and Linux, and I'm quite interested in DEM simulation, so I begin my study on LIGGGHTS.
During the past few days, I ran into lots of problems during the installation of LIGGGHTS and its post-processing tool (lpp improved based on pizza.py), thanks for helps from the forums.

Now I'd like to share my experience of installation, which is not shown in Installation Tutorial. My OS is Ubuntu 12.04, initially I use Fedora 16, but my friend suggests Ubuntu is suitable for newbie :)

Hi all
I have installed LIGGGHTS and it works well with its examples. But when I want to run lammps examples it does not work for some of them. I ran the lampps examples in the same way as liggghts examples and it works for some examples such as "intend" and "rigid". But it does not work for "dipole" and "eim" examples. there is the error massage for these examples in the following:

liggghts

Hi,

I am trying to write the mass of contained within a region to a file. I get an error at
step 10000 (I call the fix print every 10000 cycles) and the program exits. Could someone help me with my problem.

I am trying to follow the example shown in the "How To Liggghts" document under the calculate mass flow section (section 6).

My script and other associated files are attached.

Thank you

Kirk

Hallo everbody,

I've got a Problem when simulating larger number of Particles.

For instance, i've created a simple simulation for testing with 10000 Particles over 50 timesteps. The simulation starts and finishes quite fine in a few seconds.

Then I take the exact same simulation (particles are insertet via: fix ins nve_group pour/dev nparticles ${n_Particle} 1 distributiontemplate pdd1 region bc) but with n_Particle equal 1000000.

Now simulation starts and on my screen it is displayed:

...
Setting up run ...
Memory usage per processor...
step atoms ....

Hi, all.
I'm new to LIGGGHTS and Linux OS.
When I follow the Installation Tutorial to install LIGGGHTS, I get a problem.

My OS is Fedora 16.

1. when typing "which mpirun"

-------------------------------------------------------
/usr/bin/which: no mpirun in (/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/jian/.local/bin:/home/jian/bin)
-------------------------------------------------------

The above information is right? or openmpi is not installed well?

2. in /src directory, type "make clean-all", then "make fedora -j"