LIGGGHTS® - User Forum

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.

Dear colleagues,

I need to install LIGGGHTS with VTK support. I compiled VTK by using these instructions

http://www.vtk.org/Wiki/VTK/Configure_and_Build#Download_And_Install_CMake

I hope it was successfully installed. Then I followed these instructions

https://www.cfdem.com/media/DEM/docu/Section_start.html

Hello,

Is there a command in LIGGGHTS_PUBLIC to divide a system into different cells so I can calculate some physical properties in different zones of the system.
Many thanks, Haith

Good Day,