LIGGGHTS® - User Forum

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?

As subject says, I'm not sure if I'm implementing the "rolling_friction" part of the granular style correctly. I am simply trying to drain particles from a wedge shaped hopper and measure the mass flow rate using different values for friction. However, turning on rolling friction appears to have no effect, nor does changing the values for rolling friction - my mass flow rates are identical to not having rolling friction turned on.

Hi

Is it possible to have no particle-particle contact, but still have particle-wall contact? I want to test something were I don't have particles colliding with each other, but I need them to contact the walls so that they stay inside to domain.

As far as I understand it, I need "pair_style /gran/X" so that particle-wall contact can be calculated, so I have to specify that pair_style.

Hallo,

I would like to know if it is possible to visualise walls in paraview, which are implemented via "fix wall/gran/hooke/history".

For stl files, I dump the vtk files via dump mesh/vtk and open them in paraview, but this doesnt work for "normal" boundary walls (or does it?). Would be glad if someone may help me.

Kind regards
Philipp

I tried to use the insert/steam or insert/pack command to make the particle inject into the reactor by a certain velocity continuously, so I write these commands in the in.XXX file: