LIGGGHTS® - User Forum

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

Hi friends & colleagues.
In my simulation: boundaries are periodic. I want to (isotropic) compress the box until reaches 100,000 Pa using fix box/relax.
However, when I ran the code, there was no warning or error, but the box volume and pressure did not change. I have read the documentation LIGGGHTS but I can not fix it.
I am not sure whether I missed something. So, do you have any comments and advice to fix this point? Thanks

#The part of my script is:
fix integr nve_group nve/sphere

Hello everyone,

For past few weeks I have been trying to compile out my LIGGGHTS executable "lmp_auto" into a HPC cluster.

I have been using the following modules from software stack of the cluster:

1. module load compiler/openmpi/4.1.4 (For MPI based parallelization)
I am not using any version of GCC compiler as I assume that OpenMPI already has a parallel version of GCC wrapped inside itself.
2. module load compiler/cmake/3.22.5 (For configuring the downloaded VTK).

variable dia_NMC_1 equal 20
variable dia_NMC_2 equal .1
variable rad_NMC_1 equal ${dia_NMC_1}/2

# Create a big particle
create_atoms 1 single 10.05 10.05 10.05 # The coordination of the first particle

set atom 1 diameter ${dia_NMC_1}

# group for big particle
group big_particle type 1

# Create small particles on the surface of the big particle
variable num_small_particles equal 400000 # Adjust the number of small particles as needed

variable dia_NMC_1 equal 20
variable dia_NMC_2 equal .1
variable rad_NMC_1 equal ${dia_NMC_1}/2

# Create a big particle
create_atoms 1 single 10.05 10.05 10.05 # The coordination of the first particle

set atom 1 diameter ${dia_NMC_1}

# group for big particle
group big_particle type 1

Hello every body,

I'm new to this DEM field & I'm self learning . I want to simulate granular particle mass flow onto milling table of Vertical Roller Mill...So I want to know whether it is possible to simulate the mass flow rate & measure the variables. Thank you in advance.