LIGGGHTS® - User Forum

Hello everyone,

I am about to set up my workstation and thought I might ask for recommendations regarding the Linux operating system + LIGGGHTS and Paraview installation versions that I should consider.

Which Linux (Ubuntu, Fedora, ..), version of LIGGGHTS and Paraview (v5.0 or v4.0) can you suggest in order to ensure smooth simulations? I am not a Linux expert but I can get some assistance. Also, I would like to be able to run the available plug-ins for Paraview.

I am thankful for any recommendations. Regards,
Joel

Hello all,

Is there any simple way to add a new property as a vector [i][j] that save some an extra data for each [i][j] contacted particles ?

I know how to add new property for each particle separately, but I was wondering if there is any similar way to save property (data) as a reference for both i,j particles.

I want to save some extra contact information (e.g. number of contact, contact duration ) between each pairs, and based on this information I can set my other simulation conditions.

Any help or hints would be very appreciated.

Is there a list of all of the predefined program variable names used in calculations? If so, where can I find it?

Examples of program variables: Atom IDs, Atom Numbers, Young's Modulus, Normal and Tangential Stress, Sphere Radii, Coefficient of Restitution... etc.

I want to create an if statement to alter the simulation based on whether or not the predefined variables above meet certain conditions.

(For an arbitrary variable A that I create, I would refer to it as ${A}, but I do not know the syntax for referring the the program variables.)

Dear all,

I would like to count the overall number of collisions between different types of particles.
For example, I have particles type 1 and particle type 2, I want to know how many times
during my simulation a 1 particle collides with a 2 particle. Is there a way to do this?

Thank you,
Charlie

hallo all,

is there a way to use cad-files (e.g. stl-files) for the command: fix wall/region command ? Or do I have to define the regions by hand?
region cuboid block 0 0.5e3 0 0.5e3 0 0.5e3 side out

Any comments are appreciated, thanks

Joh

Hello,

I am simulating a shear cell using a servo wall as the top surface and a moving mesh as the bottom surface. The rotation period I set is some seconds.

Hello all,

Heat transfer between two particles is calculated by fix heat/gran with the equation given on

http://www.cfdem.com/media/DEM/docu/fix_heat_gran_conduction.html

Hi All,

I am simulating granular flow on a conveyor belt. Is there a way of tracking individual particle position, forces, velocities per time step or through out the simulation run.

Theo_Score

Hi!
I'm manteining the LIGGGHTS PKGBUILD in AUR. Any doubt, compilation error or suggestion you can make it right here.

You must to install liggghts and liggghts-lpp (Pizza.py) from AUR.

it's you use yaourt, it's enough with:

yaourt -S liggghts-lpp

And you will get the liggghts, pizza and lpp command in /usr/bin

Hello everyone,

I am trying to extract particle velocity and position only one time for each collision, by reading the output only in the first timestep the contact takes place and ignore the output for the rest of contact duration. I want to use these properties by variable command and fix adapt to update particle diameter.

I tried to use "pair/gran/local command", but this command gives me the output every timestep the two particles are in contact and that's not what I needed. I want only one particle property reading for the whole duration of each contact.