LIGGGHTS® - User Forum

Hi all,
I have performed DEM simulation of radial segregation in horizontal rotating drum. Results are in good agreement. Publication is being accepted. Watch simulation video:

https://www.facebook.com/photo.php?v=3090292932292

Shortly, all input files and tutorials will be posted here.
Thanks,
Ram

Hi guys!

I am currently learning LIGGGHTS to simulate the Direct Shear Box Test for soil and thinking about the Granular package.
Under the pair_style gran/hertz/history/stiffness command, I am able to define the stiffnesses of soft contact and damping constants etc,
however, I also want to define the internal friction angle of particles to describe the particle-particle friction coefficient.

Anyone can help me out on that?

Dear LIGGGHTS-Users,

I try to simulate a simple water jet that impacts on a wall. Does someone know how to generate a continuous water jet with the sph-model. I know how it works with the "insert/stream" command for a granular simulation but it seems that this is not valid for sph.

Thanks for any reply
Nate

Dear Liggghts users,
Here is something new specially for Mac users:

http://letstryscience.wordpress.com/2012/02/04/dont-reinvent-the-wheel-c...

Cheers,
Ram

Hi

I would like to generate 2 particles at two points in the space (p1 = [x1 y1 z1] & p2 = [x2 y2 z2]) with initial velocities (v1 = [v1x v1y v1z] & v2 = [v2x v2y v2z). I am not sure if "fix/pour" will be able to do this. Could you guide me through this?

Thank you

Hey

I was just speaking to a visiting lecturer about LIGGGHTS and he said that he had an undergraduate using the code, and noticed something missing in the code to do with the correct calculation of the tangential history. He said it was a few months ago he was looking at it, so I was unsure as to if this may have been picked up and amended.

Dear LIGGGHTS Users,

at the moment I try to run the case "Collapse of a water column" using LIGGGHTS. Actually this is an example of LAMMPS and I am not sure if I can run it with LIGGGHTS.
The atom_style is defined as "meso" and I get the error "Invalid atom style".

Can anybody explain to me why LIGGGHTS doesn't recognise this atom_style "meso"? What is the difference in the sph-model between LAMMPS and LIGGGHTS?

Thank you for your response.
Nate

Hi

I'm a new user , I would like to know the steps on how to install the liggghts properly on Ubuntu. I've downloaded the tar package from the download section into a folder untar the package. The instruction given in the download section for the installation of the stable version does not work for me.

Thanks

Is it possible to use a separate contact law (force vs displacement) on unloading versus what is used during loading? Thanks in advance!

Hi,

We often have the problem to restart a simulation after a specific timestep.
You can make reload-files every N-time, but I think this will cost a lot of time (in fact you are writing down the same information twice in dump- and reload file).

Thats why I coded a tool to transfer a .liggghts file (which was dumped with dump*.liggghts and inherits every data of a single dumpstep) to a reload.pour file.

I attached the code and a 64bit precompiled executable.
The ussage is: d2r INFILE OUTFILE DENSITY (because density is currently not dumped to liggghts-file)