LIGGGHTS® - User Forum

I am using the sphere type for the granular simulation, how could I include the potential force in the simulation? I tired us the Pair_style hybrid gran/hertz/history lj/cut 2.5. But I get an error message” pair hybrid sub-style is not used”. Can someone help me out? thanks in advance

I typically use the fix_nve integration (only updates position and linear velocity) for my granular simulations as this gives a good approximation of blocky (angular) material behaviour. I am wondering if the sjkr cohesion model can be used with this integrator or do I need to use fix_nve_sphere to get cohesion?

In the mean time, I am making a little test model.

Thank you,

Kirk

Hi,

playing around with the dump image command I came over a restiveness. I inserted some atoms in a lattice with create_atoms, and changed diameter to 0.2 by set command. Computes and dump local/custom are working like expected. The command dump image ignores diameter and uses 1.0, after dump_modify adiam it works as well. Is it because of using create_atom?

Edit:

Dear guys:

I am new to this forum, and I would like to seek some help in the compilation of LIGGGHTS

When I compiled LIGGGHTS using "make openmpi", I encounter the following error messages:

Good morning,

I would like to make a model using the fix mesh/surface/stress/servo command. I was wondering if someone would be willing to share a little example simulation that includes this command?

Thank you in advance,\

Kirk Fraser

Hi all,

I want to simulate a belt conveyor with ribs on the surface. (stl attached)
For a flat belt i would usually use the surface_vel command to specify the imported mesh as conveyor belt.
The Problem about this command is that there is no motion of the ribs. Think this behaviour is expected.

I am trying to use the insert/rate/region command to create a cylinder filled with particles. I have not been able to figure out what role the nparticles keyword plays in determining the number of particles added. I thought that the total number would be limited to "nparticles", but when I run the simulation new particles keep being added after reaching "nparticles". How do I create a region with a fixed number of particles? The code is below. Thanks in advance for your help.

I want to add a force on all atoms in region and the force is related to the coordination of the atoms? How should I specify the force variable? Thanks in advance.

In the newly released LIGGGHTS(13 jun13) , some functions such as “Fix mesh/surface”, “Fix Property/global” are missing. I further check the input files, the related cpp and h are missing in the Rtc folder. Is the function outdated in the lasted LIGGGHTS or should I copy the files on my own from previous version?

Thanks

Hello everybody
I am beginner with the LIGGGHTS and have a fundamental question.
What are the limitations to use LIGGGTHS for simulation of nano-particles in aqueous media? Is this software restricted only for granular microscopic particles or even applicable for simulation of mesoscopic colloids? For example, can it be an alternative for DPD (Dissipative particle dynamics) or SRD (Stochastic rotation dynamics) methods in simulating colloids sedimentation or aggregation?
Regards