LIGGGHTS® - User Forum

Greetings friends,

I was wondering if it's possible to simulate the effect of jamming (blockage) in a screw conveyor due to non-compatible particle size distributions, too high feeding rate, too high friction among particles, etc...

Specifically, do the particles interact with the rotating impeller and can influence its rotation speed ? Or cause the rotational operation to stop ?

Hi LIGGGHTS users,

I am fairly new to LIGGGHTS and modelling a rather simple problem.

What I am basically trying to do, is to fill the rectangular hopper of a screw conveyor, release a stopper (z-plane primitive) and finally start the screw conveyor.

My problem seems to be related to the fix pour/legacy. The same script, as attached to this post, worked when I used fix insert/pack.

Hej guys.

I'm trying to creat a mesh but instead i get this ERROR:

Hi all,
I am writing-up LIGGGHTS tutorial for beginners. Pleas suggest me to improve. Tutorial attached herewith, plz download and see.
Thanks
RC

Hi all
I want to stop a belt conveyor. I tried to unfix a "mesh/surface" and then fix it with a new surface_vel, but an error message shows up.

here is my in file:

Hi all, I set the units system to be si in the beginning.
Later I used fix mesh/surface/stress and export the pressure/shear/stress by dump mesh/vtk.
what's the unit of the output??? the pressure, shear, stress components??
N? Pa? kPa??
I am not sure.
thanks for help

Regards,
Xiuhan

Dear Friends,

I have a few questions about valid input geometries for LIGGGHTS.
What kind of geometries can LIGGGHTS handle? What softwares can create these kind of files?
I have Gambit, Maya, Autocad on my pc. Are there any tutorials for building geometries for LIGGGHTS?
Should I mesh the geometry and export it to LIGGGHTS?

Regards,
Shahab

Hi everyone,

I have one question about cofficient rolling friction. In my case, I used three different material, called type 1 type 2 type 3. the particles (type 1) alway roll a long time to stop on the plane (type 3). the different rolling frictions from (0.1-10) were tried, But still have the same issue.
the following is the line:

fix m5 all property/global coefficientRollingFriction peratomtypepair 3 0.75 0.1 10.86 0.1 0.65 0.59 10.86 0.59 0.65
pair_style gran/hertz/history rolling_friction cdt #Hertzian without cohesion
pair_coeff

Hi, I along with Christian Richter have re-added the fix breakparticle/force feature in LIGGGHTS 2.3.8. The modified repo can be clone from https://github.com/rahulksoni/LIGGGHTS-PUBLIC

The repo contains a breakparticle example and a successful animation of it can be found at https://www.youtube.com/watch?v=QM4JYtjU8v0&feature=player_embedded

Please have a look and suggest for improvements.

Hello Everybody,

I have a problem with this Error: "Use of region with undefined lattice " ;-)

I want to create a region defined by a VTK-Mesh. Unfortunately i can't read the VTK with the following command: "region myreg mesh/tet file test.vtk scale 0.001 move 0 0 0 rotate 0 0 0" I generated the mesh in NETGEN from a step-file. The same Error appears if I change the name of the file to test2.vtk so LIGGGHTS can't find the file. Am I doing something wrong or is there a bug in LIGGGHTS? I attatched the vtk file.

Greetings
Hendrik