LIGGGHTS® - User Forum

Hello everyone,

I am playing with multi-sphere method to generate aggregates of sphere particles by using hybrid granular molecular. First I use 'read_data' to import the essential particles (granular). Then I use 'fix rigid' to to generate clumps (molecule). I am not sure how liggghts calculate the mass of clumps and its gravity center? When importing essential particles, the 'Masses' are for sphere particles, right?

Hello Everyone,

is there somebody who has experience with the combination of a servo-mesh and rotation around an axis?

Hello Everybody,

Could some one please give some ideas about how to obtain force -displacement curve between two particles in contact .

Many Thanks,

Luton

Hi

I was unable to find in the literature the constant "K finnie" for steel, someone can tell me?

regards

Hi

I was unable to find in the literature the constant "K finnie" for steel, someone can tell me?

regards

Hi,

I tried to perform a simulation with bonds in LIGGGHTS 3.0.2 version and it is not possible to initialize the simulation. As the guide suggest, I wrote the command atom_type bond. A similar problem occurs with the pair_styles.

However, is it only working in old LIGGGHTS versions? How should I addapt these commands? Additionaly is there any online resource in which are described the commands for this current version?

Thank you very much!

How can define a vector variable in Liggghts?

regards

Hi there,

I could just knew that FLUENT-DEM cannot be possible with the "dynamic mesh" problems so may be I have to shift to LIGGGHTS software for the DEM analysis.
I was trying to find some user guide for LIGGGHTS but I couldnt find any wherein I can learn from the core.
Can anyone help me, like how should I start learning LIGGGHTS, I might be having short time to learn though.
Actually I am working on the topic TRIBO-ELECTROSTATIC SEPARATOR for my thesis.

Thank you

I'm carrying out a simple indenter simulation, in which a cylinder is slowly pushed vertically into a box of particles.

Currently, I use the following to get the forces on the indenter:

...
compute fc all wall/gran/local id pos force
...
dump forcedump all local $e post/dump*.forcedata c_fc[1] c_fc[2] c_fc[3] c_fc[4] c_fc[5] c_fc[6] c_fc[7] c_fc[8] c_fc[9] c_fc[10] c_fc[11] c_fc[12]

When I visualise the forces (having created paraview compatible vtk from the above), it seems to be in the right place, and behave correctly.

Hello Everybody,

I have just download the pre-installed LIGGGHTS (Ubuntu 14.04 package) recently, I wanted to familiarize myself with it before installing it from source code.

I was looking at post-processing for a few days now, I installed paraview 4.0.1, but I still couldn't figure out how set the environment and create an alias correctly.