LIGGGHTS® - User Forum

hello,

I was wondering what is the exact physical meaning of the characteristic impact velocity, (i.e. characteristicVelocity), and how does it affect my simulation in LIGGGHTS.

Especially that I read in the documentations that it is basically introduced in the Hookean contact model, but it is rather involved in many scripts not dealing at all with Hook's contact model.

best wishes,
Nizar

Hello all,
I have been trying to run a LIGGGHTS script using mpirun and lmpauto but am getting an error saying "Error while loading shared libraries: libvtkCommonCore-6.2.so.6.2: can not open shared object file: no such file or directory" and it is terminating the process. I recently upgraded my system from ubuntu 16.04 to 18.04.1 LTS. Is it because of the upgrade? Even if it is or not, what can I do about it?

Hoping for reply.
Shlok

Hello LIGGGHTS Experts,
I have a problem with installing LIGGGHTS on Windows 10. I tried to install this program using documentation, following similar posts and instructions, but still without success.

Hello everyone,

I have two questions regarding Hertz contact model used in Liggghts. I would be very grateful if some one could help me clear this up.

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

(1) The force in Hertz model set to be equal to Normal force + Tangential force.

These two forces are in two different directions, so how can they be added to each other ? (mathematically not right)

Hi all,

I run into [illegal mesh ID provided] error when I tried to drop a mesh (box).
The attached file contains all the script.
The command I used is
fix db all move/mesh mesh meshes/boxdrop.stl type 1 linear 0.0 0.0 -1.0

I tried change to a mesh that works, but still.
Thank you in advance.

Best regards,
Ernest

hello,

I am a new user of LIGGGHTS having some doubts regarding the coarse graining method.

almost all the papers I read dealing with CG state that there are some parameters that are ought to be adjusted in order to obtain physically accepted representation of the unscaled system behaviour by following some rules depending on the scaling factor s.

The thing is that I did not find a command where I can explicitly modify some of these parameters such as contact stiffness K and moment of inertia I.

Whenever I try to load the premade script "continuous Blending Mixer" I get this errorcode:

Greetings,

Hello all,

I will go straight with the problem, thank you in advance.

I built LIGGGHTS-PUBLIC to my Ubuntu's application on Windows 10 as the documentation states.
After a successful [make auto], I tried to run with [chute_wear] like the documentation says.

This error
$ HYDU_create_process (utils/launch/launch.c : 74) : execvp error on file lmp_auto (Too many levels of symbolic links)
appears after I tried (I have only 1 processor)
$ mpirun -np 1 lmp_auto < in.chute_wear
in the [chute_wear] example directory.

Hi everyone,