LIGGGHTS® - User Forum

Hello every body.
I would be thankful if you could help me.
I am trying to run Binflow ,However there are some errors :(LIGGGHTS (Version LIGGGHTS-PUBLIC 3.3.1, compiled 2016-01-14-14:02:34 by kloss, git commit 9b1fc57b77c483deaf2c0a6c69241c5d4f91e3c2 based on LAMMPS 23 Nov 2013)
Created orthogonal box = (-0.138 -0.138 -0.0045) to (0.138 0.138 0.43)
1 by 1 by 1 MPI processor grid
ERROR: Fix particletemplate/sphere (id pts): unrecognized keyword (/build/liggghts-QCz4in/liggghts-3.3.1+repack1/src/fix_template_sphere.cpp:277)

Hi everyone,
“What are the equations and forces that are sticking the particles to each other to form a non spherical particle by using multisphere method? what are the forces that keep the constituent particles of a rigid body together?”
and what are the equations of DEM for multishpere because it is in not clear in this link "https://www.cfdem.com/media/DEM/docu/gran_model_hertz.html" that what value of R (radius) is used for multisphere?

thanks in advance
regards

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,