LIGGGHTS® - User Forum

I try to fill a region with insert/pack using four diferent particle radii from the same template. However, if I try to use more processor cores e.g. 24 instead of 10 then there are empty regions where no particles are inserted. This seems to be associated with using more than one particle, since if only one particle size is used then all regions are filled normally without regard of the number of processors.
I attach two screenshots showing the difference. The first using 24 cores and the second using only 10 cores but the same script.

Hello all
I have a problem.
This is part of my input:
fix boxwalls_z1 all wall/gran/hertz/history primitive type 1 zplane -0.025
fix boxwalls_z2 all wall/gran/hertz/history primitive type 1 zplane +0.025
I want to particles have friction together but do not have friction with the
zplans!
How can i ?
Please help me
Thank you

Hello,

I'm interested in exploring the capabilities of LIGGGHTS for generation of multi-spheres and simulation of non-spherical particles (using multi-spheres). Where can I find more documentation on LIGGGHTS capabilities for these subjects?

Thanks,
Andy

Dear all,

Does anyone know how to find the porosity in a packing simulation?
The only way I found is to calculate the total volume of the atoms knowing the number of atoms and their radius, but I can't know which volume of the entire container they fill because they don't fill the entire volume of the simulation box.

Thank you in advance

Hello there,

I am currently struggeling with liggghts' examples section. Most of the examples I try just do not work, since I get an error of the type 'invalid pair_style' command.

After I have tried several things, I think the problem lies in the facts that my liggghts is based on lammps 10-Mar10. Eventhough I have a lammps version of 17 nov 2012!

So, can anyone confirm that this is indeed my problem? And if so, can anyone tell me how to ' update' liggghts, such that it will be based on the newer version of lammps?

Thanks in advance!

Greetings.

Hi folks,

I'm trying to install LIGGGHTS with CFD coupling for geotechnical simulations. Getting LIGGGHTS 2.3.4 from the git hub on a clean Ubuntu 12.04 LTS (Because of non released AMD Catalyst Driver for kernel 3.5 and newer.) I installed git and copied the repository successfully. Then I installed paraview (but will use binaries of version 3.98 out of a tarball), mpic++ and g++ (for c++). Running make ubuntuVTK in the src dir it stopps after a while:

Hello,

I seem to be having a problem using the fix wall/region command. My simulation entails building a trapdoor mechanism at the bottom of a region filled with grains. Thus far, I have created the mechanism by generating three "thin" regions that lie next to each other and act as the floor, and then applying the fix wall/region command to each of them to create the walls. My plan is to unfix the middle region at some stage, and the trapdoor mechanism would work.

Hi everyone,

Please take a look at the attached file, it is a picture with two images. The one of the left side is a simulation using series process. The one of the right side is a simulation using parallel process (processors 2 2 1). As you can see, the last one has a lack of particles due to the division of processors. Is it normal this situation?

Regards

Hi everyone,
I'm trying to load a restart file but it keeps error-exiting when I fix my mesh surfaces. I have the original input file that created the restart state, I've checked the log that was output for this case, and as far as I can tell I am specifying the exact same fix properties with the restarted input file.