LIGGGHTS® - User Forum

Hi there

I'm a new in here. Recently, i have tried to simulate the scratch model with sharp tip and flat surface.
I'm using the LIGGGHTS-INL, which is possible to model continuum such as steel or concrete etc with a bonded particle method.

I can build my own model and explain how it work based on the theory.
But, I want to know how observe the stress within the bond. i think i need to modify some code with related to bond part.

Hello all,
Is it possible to create a lattice with a range of diameter such 2.0:1.0:20.0. And the diameter in the lattice will be randomly distributed. I want to create particle arrangement in a way that a bunch of small particles will covered a big particle. The diameter of the small particle will be different.

variable x0 equal 0.0
variable x1 equal 10
variable y0 equal 0.0
variable y1 equal 10
variable z0 equal 0.0
variable z1 equal 10

variable regx0 equal -0.0001+${x0}
variable regx1 equal 0.0001+${x1}
variable regy0 equal -0.0001+${y0}
variable regy1 equal 0.0001+${y1}
variable regz0 equal -0.0001+${z0}
variable regz1 equal 0.0001+${z1}

I attempted to install VTK by following the procedure outlined on this website: [https://vtk.org/Wiki/VTK/Configure_and_Build]. However, I encountered a problem during the configuration step with CMake. I believe the expected outcome should resemble the procedure in the website but, I am facing an issue as shown in the attached figure. Can anybody help me with this problem?

Hi, everyone.

In LIGGGHTS-PFM, I try to run PRM with a bonded particles model. I got the following error, does anyone have any idea on this error? Thank you in advance.

INFO: Particle breakage: broke 6674 particles (mass 7.318937) at step 16804
a total of 6674 particles (mass 7.318937) broken so far.
[0] step 16804: nlocal 926 ilocal 800 999 tags 2227 1000 mol 1 1
ERROR on proc 0: Failed to operate on granular bond history during copy i1 (/home/jirayuts53/LIGGGHTS/LIGGGHTS-PFM/src/fix_particledistribution_discrete.cpp:445)

Hello

Please please please help; I have been stuck here for weeks. I have installed the latest version of CFDEMCoupling_23.02 (couples LIGGGHTS-PFM with OF-6) in our university's Linux cluster. Compilation is done successfully without nay error.

Hello everyone

I looked online but couldn't find anything that concerns my query.

I am performing pure DEM simulation, where I have a rectangular box. I generate the bed (using insert/pack command) in a rectangular box till half of it then insert particles above the created gravel bed with insert/stream command. I can see that particles are inserted, but I get a warning that sub-domain size is too small to insert particles. The warning looks like:

Hello,
I would like to collect all the dissipated collision energies from my simulation case (and possibly split into different modes normal and tangential). May I know how to do this? I mean which fix or compute and fix combinations to use?

I see that there are following lines defined in pair_gran.h, which I assume are for this purpose:

Hey, I almost have a heat transfer model working for me, only issue is that I used the fix heat/gran and fix heat/gran/conduction command to set two different groups to have different temperatures so that heat transfer can occur, however I run into the issue that I cannot have more than one fix of this style. Heres the run data below and help is much appreciated

Hi everyone,

I installed the graphical interface to advance further with the LIGGGHTS installation, but I encountered the following error in the compiling part. I reached out to ask if anyone else had encountered something similar or not. The error is in the following