LIGGGHTS® - User Forum

hello,

I am trying to recompile LIGGGHTS after applying some modifications in the input.cpp file, but I could not manage doing that unless I changed the (USE_VTK = "ON") to "OFF" in the Makefile.user, as I was getting the following error :

I try to install LIGGGHTS on OpenSuse but do not know how to install VTK as done for Ubuntu

Ubuntu:
sudo apt-get install openmpi-bin libopenmpi-dev libvtk6.2 libvtk6-dev
OpenSue:
what is it here

Thanks and regards,
SK.

Hi,
I'm trying to install liggghts version 3.8.0 on a cluster together with vtk. I changed in the Makefile.user such that VTK_LIB_USR and VTK_LIB_USR is set.
So for me it looks like this:
VTK_INC_USR=-I/vcc/homes/mfarzane/compilers/vtk/include/vtk-7.1
VTK_LIB_USR=-L/vcc/homes/mfarzane/compilers/vtk/lib

I can see that vtkVersion.h is in /vcc/homes/mfarzane/compilers/vtk/include/vtk-7.1 but it still doesnt work. I can also see that there is a lot of files in /vcc/homes/mfarzane/compilers/vtk/lib

Hi all,

I have a system containing both spherical and non-spherical particles. I am using nve/sphere integrator for spherical particles and multisphere integrator for non-spherical particles. however, the multi-sphere particles do not respond to any fix command that set them to motion (no movement,no velocity, and no force). Do you have any idea what can be the problem?

Regards,
/Masood

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)