LIGGGHTS® - User Forum

Dear all

In LIGGGHTS, I want to model a servo wall that compact particles till a specified stress is acting on the mesh. how can I do this? is it possible by mesh/surface/stress/servo??? as I know this fix cotrolls total force acting on the mesh.
any help would be appreciated.
Regards

Tala,

Hello,

I am following the tutorial to install LIGGGHTS post processing :

When I run :
"./install.sh" in the LPP directory I get an error saying :
directory '/home/daniel/bin' not found
create directory or choose different install directory using the -p flag

How should I fix this issue ?

Thanks.

Best regards,
Daniel

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