LIGGGHTS® - User Forum

Hello.

I have some question about the mutual consistency of the damping coefficients for Hertz's contact model.
From doc for gran/hertz/history (I use liggghts-1.5.1) I got:

gamma_n / gamma_t = 1/2 * (Y/G)^(1/2)

From my own solution for Hertz and Mindlin equations I got:

c_n / c_t = (5/6)^(1/2) * 1/2 * (Y/G)^(1/2)

Comparing my solution with liggghts I see that,

gamma_n = c_n
gamma_t = (5/6)^(1/2) * c_t

Hi,

since version 3.0.1 was released and there are some changes (http://www.cfdem.com/node/42), I updated the basic setup tutorial for Ubuntu(>12.04)/Mint(>14) and maybe other distributions. There is jpg and png support for dump image and back again - mpi support. It's a basic install, without additional packages and tools. The syntax highlighting for gedit was updated to LIGGGHTS version 3.x.

My problem is that i want to rotate a solid body around his axis but this body is rotated by an angle of 40° an moved in my testing area. (as you can see in the picture).

Now the command to rotate a body is for example:
fix move all move/mesh mesh cad1 rotate origin 0. 0. 0. axis 0. 0. 1. period 0.05

So my problem is that i can't explain myself how to modify this command. I hope someone can help me.
Thanks

Hi,

I've built LIGGGHTS with the ASPHERE package and was able to generate an ellipsoid particle, but I'm struggling to find how to use a dump command to output data like the shape diameters and the quaternion to define orientation. I'm using "atom_style hybird granular ellipsoid"

Any help anyone could provide would be appreciated, thank you.

Hi all,

I'm trying to setting a variable heat source depending on particle temperature i've read that this is a task that it can be accomplished with the new version of liggghts, so here is my code:

#---------------INIT SECTION------------------------------------------------------------------------

Hi guys,
I am working on the simulation of discharging of particles from a flat bottom hopper. When the discharging is completed, there are one layer of particle sticking to the cylindrical walls. (please see the attached figure). I also attached the meterial properties that i used. Does some one work on similar topics and know the problem? Thank you.

Hi all,

When i run the liggghts examples, it is showing the following error:

liggghts: error while loading shared libraries: libmpi_cxx.so.0: wrong ELF class : ELFCLASS32

I have given the path also.

Please someone help me to solve this.

Regards,

Narendra

Please move to appropriate forum section if needed.

This is the first time I've visited the site in several months, and while the new design looks good, it appears that many of the links are missing/broken? None of the "LIGGGHTS features" links have any pictures associated with them, and I can't find any of the downloads.

Am I missing something?

Hi!

Is it possible to fix the position of a few atoms, i.e. the atoms should not move even when the other atoms hit them. so, in a sense the atoms behave as walls but are not continuous?

Regards,
Tamoghna