LIGGGHTS® - User Forum

Hi,
I am a new user of Liggghts and have some problem. I am trying to use compute pair/gran/local command for calculating the contact force of grains. I know that this compute calculates a local array which can not be used as a variable.
1. how can I perform some math operators and functions on specific columns of this local array (for example use ^ or * and then calculate the sum of all the vector elements)?

Hi all,

It's been a long time since my last visit on the forum.
I hope someone will be able to give me some clues to solve my problem.
I try to perform hybrid simulation with pair_style peri and granular.

First question, do you know if this hybrid simulation is possible with LIGGGHTS ?

From the attached picture, you can easily understand that I want to use the granular pair_style to control the interactions between the particles and the walls.

Hi,
I am new in this plateform, and have some questions in general concerning the LIGGGHTS.

As highlighted by various features, the LIGGGHTS is able to simulate heat transfer problems in complex particle systems. In parallel, the SPH and Electrostatic mudules are available also within this LIGGGHTS package.

Just wonder if we are free to select more than one moduel, such as, these three modules at the same time to simulate the heat transfer processes in, e.g., nano-scaled porous structures?

Thanks in advance

Yuanjl

Hi!

I was trying a simulation with about 20000 particles of 0.003 m diameter. When I use the command for pour/legacy as:

fix ins1 nve_group pour/legacy 20000 2 10001 vol 0.4 100 diam 0.003 0.003 dens 2284 2284 region fac1
fix ins2 nve_group pour/legacy 20000 2 10001 vol 0.4 100 diam 0.003 0.003 dens 2284 2284 region fac2

I get error saying
Neighbor list overflow, boost neigh_modify one (neigh_gran.cpp)

When I use the command for pour/legacy as:

Hi folks,

I am trying to chase down what would cause particles when dropped into a cylindrical container to settle in a bowl shape. that is the outer particles are a number of cm higher than the ones at the center.

I have included an image of the settled particles in this state as well as the input script that was used for this.

Hello, Christoph

I would like to download LIGGGHTS 2.2.3, but I couldn't find the file in "Downloads". could you check it?

Thank you!
Xuetao

Hi!

I was trying to install LIGGGHTS 2 in MacOS using macports using instructions in http://letstryscience.wordpress.com/2012/02/04/dont-reinvent-the-wheel-c...

But I was getting the following errors.....

Hi,

LIGGGHTS-examples contain usually the following line to dump the main parameters of particles:

dump dmp all custom 200 post/dump*.chute id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius

How can also be dumped the stress for each particle?

Thanks

Hello,

I get an error message when using the fix move/mesh rotate command:

"Fix move/mesh (id rot): only one reference point allowed (fix_move_mesh.cpp:221)"

I'm not sure what his means and I dont know how to solve it.

I got an .stl file, which i first move by

"fix move/mesh linear"

This works fine. After that I unfix this command and use

"fix move/mesh rotate"

where I get the discribed error message.

Regards
Philipp

I'm trying to use the new atom/vtk dump format...

According to the documentation the syntax is

dump ID group-ID style N file args

where atom/vtk args = none

I've tried the following:

dump dmp all atom/vtk 800 post/dump*.vtk

But I get the error: Invalid dump style (output.cpp:399)

Any suggestions from the LIGGGHTS gurus? Also with no arguments what exactly is exported with the atom/vtk output?