LIGGGHTS® - User Forum

Hi everyone!
I'm new in LIGGGHTS and to begin I see the example chute_wear, in this , I have a question, how i can get the contact force between the chute and the particles?

With pressure and area I can calculate force per cell, but it's a scalar value, and I would like to sum all of this to get a resultant force on the chute per time step.
I've done this ( like the graph), but are in different directions, thath is wrong :(

Hi.

I have a problem with inserting a wall in my simulation.
When I launch the simulation, the one spherical particle I insert, falls down to infinity, ignoring the wall.

Can anyone take a look

## code is attached

Greetings,
Luca

Submitted by Noel682 on Fri, 10/16/2015 - 17:09

Hi all... developers and users,

I am very new to LIGGGHTS and I have a question about an exercise:

# Using: LIGGGHTS (Version LIGGGHTS-PUBLIC 3.2.1)

Hi all... developers and users,

I am very new to LIGGGHTS and I have a question about an exercise:

# Using: LIGGGHTS (Version LIGGGHTS-PUBLIC 3.2.1)

Hello everybody:

I downloaded the most recent LIGGGHTS version to simulate multisphere in the inside of a mill. However, when i compile it, these warnings appear:

WARNING: time step too large or skin too small - particles may travel a distance of 3.440580 per time-step, but half skin is 0.025000
WARNING: time step way too large - particles move further than the minimum radius in one step

My question is how to fix those warnings in order to have a better simulation?.

Hello everybody,

I am looking for a possibility to make use of symmetries (axisymmetry) in my geometry for my LIGGGHTS simulation.
I had a look into the Doc and found the possibility to create a wedge-region (e.g. a quarter of a cylinder). But according to the Doc, when I use the create_box command, LIGGGHTS would wrap the wedge-region with a rectangular block.
The thing I am looking for is the possibility to set a periodic boundary condition that links two faces that are not of the same dimension, e.g. the lower x-face with the lower y-face.

Hi all,

Under the influence of what parameters, overlap is considered to be maximum?
How can particle understand it has the maximum overlap and then tends to disengage from the collision (both in particle-wall or particle-particle) ?

Thank you.

Im trying to use the newly added cohesion modell for capillary forces. I can not manage to get it to compile, I always get an MPI error.
I use the following in file to try it, which is just a modification of one of the tutorials. Could someone please confirm that it is working and that its just not a bug. If it is working then I would ofcourse also appreciate if some can see what Im doing wrong. Im doing my best to figure that out.

## Initialization

units si
atom_style sphere
boundary f f f
communicate single cutoff 5.0 vel yes
newton on

Hi,
I am new to DEM and I have never used LIGGGHTS. Before I get started with the software, I was wondering if LIGGGHTS can simulate the packing of particles of various aspect ratio. If so, is there any tutorial on this type of simulation? My end goal is to predict packing porosity for a given particle size distribution of different aspect ratio. Please let me know if you have done something similar in the past. I would appreciate any input.

Thanks

Dear All

is it possible to install two different LIGGGHTS version together?

Regards

Esmaeil