LIGGGHTS® - User Forum

Hello
I am relatively new to LIGGGHTS-Flexible fiber version. I was going through the tutorials about using the restart files.
I some tutorial folders I found: main LIGGGHTS file, read_restart and write_restart files.
Can you please let me know (or direct me to a place where I can learn) about the meaning and how to use these different kinds of restart files.

Thank you very much

Shubham

Hi all,

1) Could you please explain the meaning of output of the following commands:
compute cpgl all pair/gran/local pos vel force (https://www.cfdem.com/media/DEM/docu/compute_pair_gran_local.html)
and dump dmp3 all local/gran/vtk 200 post/forcechainvtk*.vtk cpgl (https://www.cfdem.com/media/DEM/docu/dump_local_gran_vtk.html)?

Hello,
I am new to the field of simulation with LIGGGHTS. I have already done some tutorials and could already successfully import STL files here. I have a problem when importing a very large and complex geometry of a casting (many curves and different diameters).

Hello
I have a question regarding "Flexible fiber version'
I want to carry out an axial vibration test on a flexible fiber. Based on the chosen inter-particle distance (lattice spacing), we can discretize the fiber eithe closely packed or loosely packed. Please refer to the picture attached for quick reference.
Keeping one end fixed, if we axially pull the other end and release, vibrations are expected. My question is as follows:

Dear All,

the link which points to the syntax highlighting file is wrong. Can anybody send a usable link to the syntax file?

Thanks in advance, Feri

I'm running the same calculation (particles dropped in a box) on the same PC (4 core i7) using 4 threads in openmpi. Results are as expected the same, but calculation time varies drastically (up to 30%).
Commands are supplied from the same input file.
I'm using LIGGGHTS-PUBLIC 3.8.0

Anyone can explain why that could be?

Hi All,

I am newbie in LIGGGHTS and I would like to make the silo filling/discharge simulation based on the tutorial video on Youtube. However I made typos in the script because I got plenty of error messages "Substitution for illegal variable...".

Is any way to find in which line is a typo in the script?

Thanks in advance, Feri

How can I implement repeated load triaxial test setup in LIGGGHTS?
Repeated load triaxial test description:
Deviator stress is a haversine load with 0.1 second of loading period and 0.9 sec of relaxation period. For this I understand, I need to use some loop but what is the exact piece of code that I can use to implement this?

Is there any method to clear the RAM during the execution of LIGGGHTS program?
Currently, I am using an octa-core CPU with 8GB of RAM and it has been exhausted in the middle of the program.

Hi

I am working on the modelling of SLM. I am actually a total beginner. I would be glad if anyone can help through with the steps involved in the simulation. I have understood that I need to make use of Liggghts to simulate the powder particles and then couple it with OpenFoam to simulate the moving heat flux/laser. I would be really glad if someone can provide with a sample input file, so that I have something to start off with.

Thanks
Ojas