LIGGGHTS® - Developer Forum

Hi Everyone,

I have been working with LIGGGHTS for the past three months. I am trying to understand how exaclty is the heat flux calculated in the program.

Hey everyone,

I'm a beginner to LIGGGHTS and C++. I'm currently looking to modify LIGGGHTS to compute and store frictional dissipation at the contacts.

Hi !

The last question on the GPU support with LIGGGHTS was in 2020.
I just wanted to know if since there are some updates.
Is LIGGGHTS-Public compatible with GPU or not?
Does the non public version provide the GPU support ?

Thanks in advance.
Best regards,
Ainur

Hello
I am extending LIGGGHTS-flexible fibers version to include nonlinear bond model. To correctly calculate bond energies in bondgran.cpp, I have increase the size of n_granhistory from 14 to 18, which I update in increments at every step.
If I now use some of the old simulations' restarts (based on previous version, i.e, 14 n_granhistory), it throws the following error:
"Íncompatibel restart file: file was created using a bond model with a different number of history values" at line 767 in atom_vec_bond_gran.cpp,

Hello,

I plan to use rolling resistance models.
Studying those models and related codes, I feel that there is a mistake in this header file (ROLLING_MODEL_CDT.H).
I think that for rolling resistance models, wr1 should be sidata.omega_i[0]-sidata.omega_j[0] based on Ai et al. (2011)'s paper instead of using
wr1=(cri * sidata.omega_i[0] + crj * sidata.omega_j[0]) * rinv in the header file (surface_model_default.h).

Could anyone confirm this for me?

Thanks in advance.

Hello All,

I am trying to develop a simple shear test simulation, but I want to set the particles as a wall. How can I implement that using Ligggghts?

See the attached image for clarification.

Best

Saeed

Hi all LIGGGHTS experts,

I am trying to customize LIGGGHTS code such that DEM model can delete particles which has reached a temperature threshold. I am wondering if someone has already succeeded to implement such a temperature threshold on LIGGGHTS code?

Thanks

Hello all,
I am Tarun from India. I wanted to install Aspherix basic in my system. But, while purchasing, I noticed that there is no option for "India" in the "Region" drop-down. Thus, I could not buy it. Can anyone please help me with this???

I really appreciate any help you can provide.

Regards,
Tarun

I am trying to add a spherical harmonics solver model (Keaveny and Maxey) for magnetic force calculation between paramagnetic particles in a uniform magnetic field. Currently, I have the solver written in python using many scipy libraries like linear system solver, combination formula, and associated Legendre functions. Is there a simple way to write these in c++ for LIGGGHTS, or can I include some other libraries like Eigen which may help me?

Hi, I ran some simulations with dense granular material where the particles are stored in different containers ( cube, cylinder and annular cylinder) and the only external force on them is gravity. I model the particle-particle and the particle-wall contacts with the Hertz contact model with the history model enabled (without adding cohesion nor rolling friction). Every case has been run once using .stl meshes and replicated using primitive walls.