LIGGGHTS® - User Forum

Hi everybody,
Some one can help me to install ligggths on ubunto v 13.
many thanks,

DEM

Hi all
how can make particales with two different sizes(just 2 sizes: r=1 & r=2)in liggghts?
Thank you

Hi all,

I try run a simulation with small particles, for this I use two distributions of particles with radius 0.0001 and 0.00015.
The simulation run fine, but when the particles in contact with the geometry jumps far away beyond the box.

For example, I modify the example "chute_wear" and just change the radius of particles and the results are like i said (
see attachment).

Any idea for help me in this problem?

Regards,
Felipe

Hi all

I'm running a simulation with cohesion model.
I would like to get the value of normal contact force and cohesion force separately, is there anyway to dump the cohesion force or how can i access the variable Fn_coh in the source code?
Thank you for your help!

Best regards

Duy

Hi all
How can I calculate best timestep for my program!?
Thank you

Hallo everybody,

I'm wondering how the contact force between particle and an stl-wall is calculated?

In the pair_gran doc the particle-particle contact force is explained, does it also apply to particle-wall contact?

If yes, what does the parameter m* stands for?

Kind regards
Philipp

Hi all
I have a problem.
When I visualaized my program,I see that 2 particles are stuck together!
and are separated from other particles!
I do not know why!
My program consists of 2800 particles and particles rotate in a ring.
friction=0.7
timstep=0.00001
Please help me
Thank you

Is there a limit to the amount of timesteps that a simulation can be run? Is it possible to run simulations up to, say, 100 billion timesteps?

Hi all
I have a ring that rotates around the Z axis . Is there any other way (except to change period) to determine the rotation rate?
*********
fix movecad1 all move/mesh mesh cad1 rotate origin 0. 0. 0. axis 0. 0.0 5.0 period 3
*********
THANK YOU

Hi everyone,

I tried to model a conical wall with the "fix wall/gran/" command. However, the result shows an error as "unknown primitive wall style". Does anyone know how to model a conical wall or how to modify this? Thank you.