LIGGGHTS® - User Forum

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

Hi, I tried to apply the bonding model to my LIGGGHTS.

I downloaded the LIGGGHTS-WITH-BONDS at github (https://github.com/richti83/LIGGGHTS-WITH-BONDS), and also found the bondsfalloncone example at github (https://github.com/Polyun/LIGGGHTS-PUBLIC/tree/master/bondspackage/bonds...).

Hi, I was looking for the meaning of the "hard_particle yes" command needed for high young's modulus and I don't find the answer. I thought that means the same that hard-sphere, contact by impulsive forces instead of overlap but that doesn't have sense, because I can use hard_particle at the same time as the hertz model that work with overlaps.
I hope someone can help me to understand why this command must be used

I have adapted the compute conts function to make contact calculations for a model that depends on the surface contact area between contacting particles. For superquadrics however, the rsq <= radsumsq condition in compute_contact_atom.cpp overestimates the contact time when the superquadric contact point is not at the maximum radius for both particles. The correct calculation of deltan (total deformation) for superquadrics is needed to make this work properly. For particle-wall contacts this is much easier to find, see :

Hello friends, greetings.

I'm looking for the rotating drum tutorial in which the wall is made of particles. By any chance, any of you have a copy of in.* file?
Or
Any such files where we have a wall of particles moving / rotating? I want to understand the setup. Eagerly waiting for your reply.

Thank you,
Jagan Mohan.

Hi
I would like to count the collision frequency between different types of particles in each time step.
i have 16 types of particles :
i did manage to count for each type, but what i need is to count for example :
Between Type 1 and Type 1, between Type 1 and Type 2 ...., between Type 16 and Type 16.
here is my code :