LIGGGHTS® - User Forum

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}

I want to generate single particle with large radius like a tennis ball. I am trying with given command of particle distribution but not getting success.
Actually I have task to impact a large size particle into the pool of smaller particles (big particle size is more than 20mm and smaller particles have size around 2mm).

Is this okay if instead single particle I use cad stl file of sphere? I tried this also but as stl(sphere) falls domain boundary stretches , I can not use fixed boundary as in this case particles get lost.

Please tell me how do I proceed?

I am having difficulties trying to simulate biaxial rotation of an imported mesh.

I am looking the simulate the motion which occurs during rotational moulding where the mould (mesh in this case) rotates around two of its axis.
The current rotation commands within LIGGGHTS that I've found allows rotation to be set to the coordinate system in space but not to the mesh itself, which is where my issue lies.