LIGGGHTS® - User Forum

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,

Hallo everyone,

is there a way to dump the deformation of a sphere when applying the multicontact/halfspace? And then show it in paraview?

best regards
Johannes

Hello,

I'm getting the following error when I try to restart a simulation where I used a distribution of sphere sizes:

ERROR: All pair coeffs are not set (../pair.cpp:231)

Since I cannot find the cause of the problem, I would attach below the input script hoping that someone can help me.

processors 16 5 1
modify_timing on
newton off
read_restart restart/third_raking.restart
pair_coeff * *
communicate single vel yes
neighbor 2e-05 bin
neigh_modify delay 0

Hey all,

I want to add electrostatic force to my simulation. Does someone have the experience to do this? How can I define electrostatic force in LIGGGHTS?

Regards,
Shahab

Is it possible?

I've been reading the code and LIGGGHTS-PUBLIC uses a uniform domain decomposition, on the other hand there are some pieces of code showing it could, eventually, support this kind of domain decomposition (for instance, the Comm class has a public attribute called uniform and the comments make one think it's for non-uniform domains).

Greetings,
Miguel.

Hello,

I am working with LIGGGHTS 3.5.0 and I modified my dump files so I get a new line in the header with the timestep of my simulation (see below). It is easier for my postprocessing where a Python program comes and reads directly my timestep.

dump final all custom 1 postLoading/drumLoadingFinal_*.dump id type x y z vx vy vz fx fy fz omegax omegay omegaz radius density
dump_modify final pad 8 sort id label TIMESTEP_${timestepPerso}