LIGGGHTS® - User Forum

Hi,

I am new to LIGGGHTS. I am looking to the LIGGGHTS tutorials. Can someone please explain where do I mention the number of particles in the input script for LIGGGHTS?

Thank you.

I am attempting to use the multisphere break command to break apart the particles upon exceeding a vertical force. However, I receive an error stating that 'trigger_name' is an unknown command. Note I do not receive an error when the command is changed to 'trigger_fixName' and an appropriate fix is given. However, I intend to subject a multitude of multispheres to a compressive force, which continually increases. The code is shown below.

#Multisphere

atom_style sphere
atom_modify map array sort 0 0
boundary m m m
newton off

DEM simulation of granular material using original particle size of 1 mm run for a while and then terminate automatically, while the when particle size increased to 5x-10x then simulation run correctly. What could be the reason for this? how this issue can be solved.

Hi everyone,
I'm try to simulae a tumbling mill and I want to estract some data such as the impacts number and the impact energy of the particles;

Hello everyone!
I'm trying to simulate a ball mill and I'm using at the moment a very simple geometry to obtain acceptable computation times since I'm learning now LIGGGHTS. While looking at the documentation page, I read about the possibility to assign variables instead of exact values to both the magnitude and the direction of hte gravity vector and I was thus wondering if there's a way to avoid heavy computation by using this trick instead of moving he mesh.

As a first attempt, I first inserted the particle into my geometry using a classical gravity vector, using:

Hi all,

I have got question about how to compile the 'in.filename' in parallel without copy executable 'lmp_auto' into the same folder. As suggested by the Liggghts documentation that the final step to make it compiled is

"cp lmp_auto ../examples/LIGGGHTS/Tutorials_public/chute_wear
cd ../examples/LIGGGHTS/Tutorials_public/chute_wear
mpirun -np 4 lmp_auto < in.chute_wear"

Hello,

I'm facing a problem in pair_colloid.cpp
I designed a small testcase containing just 2 particles, radius 0.01µm and varying the initial distance between them. They are underlaying DLVO potential by hybrid overlay colloid and yukawa/colloid
For larger initial distances the simulation is working. At a distance of 2µm I get an unspecific error (seems like division by zero). For distances smaller than 2µm I get the error: "Overlapping large/large in pair colloid" (line 187 of pair_colloid.cpp).

Hi, after running :

examples/LIGGGHTS/Tutorials_public/superquadric/in.particle_particle

When I open the dump files in Paraview the variables quad1, qaud2, qaud3, quad4 are missing, while shape x,y,z and blockiness 1,2 are present. I would like to check the initial settings for quad. Does someone know why these values are missing?

(The Liggghts version is 3.8.0 and I used 'make auto' in the src folder then copied the lmp_auto executable to run the code.)

Many thanks, John

This might be a idiot question but I have been stuck for a while. I would like to ask how to assign number of multisphere particles into the insert region. I used the "multisphere_stone_restitution" in LIGGGHTS' example. There are 50 coordinations in the data file, and only 2 clumped particles were created. I wonder how to increase the number of clumped particles ? Should I increase the number of coordination? I read the LIGGGHTS' manual but it does not (or I missed it) mention about this problem.
Thank you for your time.

Hello everyone;
By some reasons, I need to use LIGGGHTS 3.2 to simulate my model. I need to clump the particles to make the irregular shape. I know the function fix particletemplate/multisphere can do that job, but it is only available in LIGGGHTS 3.3 onward. I tried to copy the fix_multisphere in src 3.3 to 3.2, but I could not compile. Can anyone suggest me a solution?
Thank you