LIGGGHTS® - User Forum

Hello,
I'm struggling to understand what is wrong with my simulation since I specify a particle size distribution in the input file which is not reflected in the output file.

Can anyone help me please? Basically it looks like I get a shift of the mean value of the PSD toward higher values in the output file.
It seems that this might be related to missing of the smallest particles in the output file? Not sure why they are not there as checking the log file all the particles seem to be inserted.

See below input file

Hi all,

Does any know why my particles are floating after inserting? I would like my particles to sink/settle to the bottom without floating. I have attached with my script. Thanks in advance.

Hi all,

I wish to insert particle into a 100*100*100 cubic. I would like to form the figure as attached with particles are settled under gravity and align with each other. (the one with blue particles) However, I couldn't able to form it and particles distribution are not similar to a cubic shape. (the one with grey particles) I have attached the figures and my script. Thanks for the help.

I am using liggghts-with-bonds and trying to perform an indentation. Unfortunatly the bonds suddenly break shortly after they are created(5519 bonds are created at timestep 50000 and they suddenly disappear after timestep 52500). They are not even under any stress. The torque in the bonds just before they break does not nearly reach the maximum. I tried playing around with the relevant parameters but can't produce significantly better results.
What am I doing wrong?

Hi everyone,

Can I divide my simulation domain into the number of section or parts in the paraview to find the number of particles in each sub section of the domain to find mixing index.

I have also attached the image of my simulation. I want to divide this into the number of subdomains to find the subdomain based mixing index.
Please help me
thanks

Using OS X 10.12.2, I attempted to use 'make auto' to run liggghts for the first time but am getting the following message:

Hi All,

I am creating a particle bed and want to visualize in 2D. Here I am attaching 3D picture of particle bed. I tried with slice and clip options in paraview but couldn't get it.

Govind Sharma

Hi Everyone,

I was wondering if someone can help me with the following problem I experience with mesh files:

I have created a mesh for my simulation using Freecad and I get the following error in the simulation run:

ERROR: Mesh cad1: The minumum angle of mesh element 330 (line 2312) is lower than the specified curvature. Increase mesh quality or decrease curvature (currently 0.000010°).

Hi, everyone,

I am a new user of LIGGGHTS and CFDEMcoupling. When I try to start a tutorial chute_wear case of LIGGGHTS, it returns an error

------ -----------------------------------
dump dmp all custom/vtk 200 post/chute_*.vtk id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius
ERROR: Invalid dump style (../output.cpp:634)
------------------------------------------

Hey there,

I have to calculate the porosity (or the packing density) of the atoms in a simulation.
Does anyone know how to do that?

Thanks,
Best regards