LIGGGHTS® - User Forum

Hello all!

I'm writing my own code in 'C' for DEM modelling of granular flows.

How does the energy minimization work? Can someone please explain?

Regards.

Hello liggghts forum,

Is it possible to set timing while dropping particles? I mean I want to drop particle A1, and after few seconds I want to drop particle A2 and so on.

Right now I am using this command,
fix ins nve_group insert/pack seed 32452867 distributiontemplate pdd1 insert_every 1 overlapcheck yes all_in yes particles_in_region 1 region bc

Hi

I want to simulate bonded granular material. But LIGGGHTS-public version 3.8 does not support bonded contact. Is there any way by which I can use LIGGGHTS-public version 3.8 for simulating bonded material

Hi everyone I'm trying to compile liggghts on my university's cluster without VTK.
I turned off the USE_VTK in the Makefile.user from the directory src/MAKE and everything looks fine but when the compilation reaches the below line it stuck and won't continue anymore. I tested the source codes on my personal computer and it worked fine but on the cluster, it won't continue to compile liggghts.
...

How to use DLVO potential in LIGGGHTS?

I have successfully compiled the colloid package from LAMMPS in LIGGGHTS, but I encountered some problems when I use it.

The error message:
ERROR on proc 0: Overlapping large/large in pair colloid (../pair_colloid.cpp:187)
ERROR on proc 4: Overlapping large/large in pair colloid (../pair_colloid.cpp:187)

Thanks.
Xie

I would be really happy that any of you share a triaxial code with me as I am beginner in this field.
I have already wrote this code :

#####################################################################Triaxial Test######################################################################

#################################################################### Granular model ####################################################################

atom_style granular

atom_modify map array

boundary m m m

newton off

communicate single vel yes

Q1. Does liggghts control maximum normal overlap between particles or is there no limit to maximum normal overlap?

Q2. How is temperature related to kinetic energy of each particle? What will happen if temperature is not maintained constant for simple granular flows?

Q3. How to create initial lattice of particles (specifically, how to increase the packing fraction of initial lattice of particles?)

I'll be grateful if I can get responses as soon as possible as I've to add these things to my master's thesis.

Thank you!

Hello!
I need to calculate the stress due to deformation of two bodies. I have been using the compute/stress command to do so. On comparing with the forces which i calculated manually for a given deformation, I realised that the stress values that i got from LIGGGHTS is actually equal to the force * overlap.
I wanted to know if indeed the compute stress/atom command is storing the work done due to deformation. If so, which files can I refer to where the calculation is being done?

Hello LIGGGHTS forum, I really appreciate your help.
I have been trying to do a simple simulation. Recently I noticed that more particles are created when iteration is increase. I actually need only one particle in my dump file. I have included my script and dump.data file here with few questions.
Could you kindly help me?

Scripts:
# Initialize

atom_style granular
atom_modify map array
###########################################################################################
#Describe boundary

Hi,

Since I am new to DEM, I have a very basic question. Is there a way to fill a geometry with particles by using insert/pack? Maybe define the Geometry as a Region in some way?

Any help appreciated. Thanks. Regards,
Leandro