LIGGGHTS® - User Forum

Hallo LIGGGHTS Experts,

i am very new to this software and also very new in the field of particle simulation. I am planing to do the Nanoindentation simulation through LIGGGHTS. Therefore i need to create a bond model, which is only possible through the MOLECULE package.

I have tried to install this package but it is showing some error. I have tried to do it in two steps, as mentioned in LIGGGHTS online document.

Step 1: type make yes-molecule (from src directory)
Terminal gave back the following statement:

I obtained LIGGGHTS-PUBLIC from GitHub, where the latest commit is

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commit f7be0a1370ccdd5f315a36cd9842c320035557aa
Author: Andreas Aigner
Date: Tue Sep 6 11:59:15 2016 +0200

Added missing sphinx configuration and makefile for documentation
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When I did "make openmpi", the compilation failed with the following error message:

Hello every one,

Could some one please tell me which source code and function are used to detect the contact between the particles and the mesh wall.

Thanks in advance.

Regards,

Luton

Hi

I am a new liggghts user. I am having challenges with importing Solidworks generated mesh into liggghts. I have done some tutorials using the supplied mesh and even changed the input file using the supplied mesh and everything was running fine. Now when i create my own mesh in solidworks, it is not working. I generate my mesh as follows:
1. Draw solid model in solidworks
2. Save the model as stl
3. Import the stl file into liggghts

My other question is how do I know if my mesh is within the defined computational domain in liggghts.

I just want to make sure that my restart files using v. 3.3.1 will be able to run on v. 3.5? I'm trying to make sure my personal simulation files will be able to run on my school's distributed server after they perform an upgrade (they currently run 3.1, which I know is NOT backwards compatible).

Thanks

Dear all.
I am new to LIGGGHTS and I want to run a code for a set of granular materials under compaction.
in compute section I have used the ''compute 7 all voronoi/atom'' and when I run the code I receive the error: invalid compute style (../modify.cpp:982).
I know that the error is for the "compute 7 all voonoi/atom". I think I have used the correct syntax for VORONOI compute, but still I get the error. Does any body know how can I solve this problem?
Compute section of my code is as follows:

Hi!,

I am inserting atoms in a specific region using the region mesh / tet command. Now i insert the particles in two different places defined in the same VTK file. When I define two or more separate locations from each other to insert atoms, I must reduce the quality of the mesh to avoid problems like 'you have 6 neighs, but 5 expected'. If I want to generate several mini-regions, I have to make a very poor meshing and the figures lose their original form. How i could solve this problem ?, I can't use "heal auto_remove_duplicates" because it only works in 'fix mesh/surface'

Dear particle friends

Based on a LIGGGHTS-Tutorial I have set up a planar sandglass. As first step I will fill in some particles and let them settle. A simple case I guess. But the gravity is totally inactive. I checked the input script several times tried some changes, checked the help, the forum an so on. It's no use.

Is there anybody who can quick check my script and check if it runs properly?

Thanks a lot for help.
Cilo

Does LIGGGHTS have a compute style to calculate the total unbalanced force in the system? Or better yet, a ratio of the total unbalanced force to the sum of all the contact forces? I use such a ratio in other programs to determine whether my simulation has reached a stable state, and I'd like to move onto using LIGGGHTS now.

Hi there,

I'm a master's student beginning to work with multispheres in LIGGGHTS.

I want to know what is the best way to do the Step 2 of this example: http://www.cfdem.com/multi-sphere-method-resolved-non-spherical-particles