LIGGGHTS® - User Forum

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

Hi everyone,

I am working on multi-sphere simulation. I want to find out the mixing status of particles in my simulation. for this purpose, i want to use lacey mixing index, it requires the concentration of 1 type of particles in each cell.

please help me how to find the concentrations of particle having type 1 in each cell. and also tell me how can I find the total number of cells.

thanks in advance

Hey everyone,
I have a simulation of a packing which works flowless on an older version of Liggghts but i only get 2 atoms inserted in the Version 3.0.x.
Here is the code:

#Simple chute wear test

atom_style granular
atom_modify map array
boundary p f f
newton off
processors 2 2 1

communicate single vel yes

units si

region reg block -0.0015 0.0015 -0.02 0.02 0.0 0.055 units box
create_box 1 reg

neighbor 0.001 bin
neigh_modify delay 0

#Material properties required for new pair styles

Hi all,

I am new to this software. I am hoping to create a 100mm*100mm*100mm cube box with spheres inside the box and then applying confining pressure on all sides.

I have tried to import a mesh created from AutoCad (using other computer and copy back to my own computer) using the fix mesh/surface/stress/servo.
However, some errors are happened and the script is terminated.

Can anyone help with this? I have attached with my script. Many thanks.

Josh

Hi everyone,

I am doing multi sphere simulation. it takes a lot of time. Due to some reason like computer shut down my simulation stops. I want to restart the simulation from the same point where I left the simulation.
I have read the two commands write_restart and read_restart (https://www.cfdem.com/media/DEM/docu/write_restart.html) but I cannot understand where to place the write_restart command in the input file and how to use the read_restart command to restart the simulation where it left.