LIGGGHTS® - User Forum

Hi all

I'm simulating a ball mill and I would like to know when the particles have filled 15% of the ball mill volume in order to stop de insertion. Is there any way to do this adding a line in the script?

I'm filling the ball mill with insert/stream fix but I don't think this is the best way. is there any better way to insert the particles in this case? I would like to make start the spin of the ball mill sooner.

Best

Hello,

I was trying to run LIGGGHTS examples using liggghts executable. But it shows the following error -
ERROR: Illegal pair_style command

I am using newest version of LIGGGHTS. But when i write 'liggghts' on terminal shows-
LIGGGHTS 1.5 based on lammps-10Mar10

What might be the reason for that error?

Please help me out.

Thanks
Manjura

UPDATE 7/14 - I've attached a file containing the CAD files for the tutorial cases.

*******************************************************************

I've recently worked up something of a tutorial for running some basic LIGGGHTS simulations that I hope others may find of some use. The attached document contains some sample input decks with some comments as to why certain commands are included. There is also a section at the end of 'best practices' compiled from some user experiences.

Comments, additions, or suggestions for improvement are welcome!

Is there a way to combine a rotary and linear motion so that the axis of rotation moves with the mesh?

When I apply more than one fix move/mesh/gran I do not get the motion I am expecting. I think I need a way to update the rotation point so that after the linear motion the rotation axis origin is updated. Can this be done with a variable that is updated in a for loop with inputs from the linear motion parameters?

Any ideas about how I can set something like this up?

Hi,

new versions are avaibale and some things changed.

Hello, I was wondering if there's any way to group atom types together.

I'm clumping multiple spheres together to act as one particle. Each aggregate particle requires a "fix rigid" on a group, which is works fine. The pain is that the "fix property/global" requires vectors (peratomtype) and matrices (peratomtypepair) of parameters, even if they are all the same material (have the same parameters). For a few particles, it's no big deal. More than a few, and it's very tedious.

In my mind, I'd like the following to work (in pseudo-code):

Hi Chris,

I wonder how to read pre-defined data (x,y,z, radii, density) for atoms input.

For generation of particles with irregualar shapes, provided that I have a individual input file 'particle1.dat', and the content is like this:

// x y z radii density
-2.12 1.32 1.49 0.061 2202.2
-1.32 3.65 1.47 0.043 2044.5
1.65 2.67 1.51 0.023 2051.5
2.76 1.98 1.23 0.034 2107.2
....
// total N spheres

Hi!
I would like to create a BOND between particle and the face of an obstacle at the time of impact. what command I can use on LIGGGHTS?.
And, what are the "bond_type" commands can accept cfdem code?

Thanks~~~~~~~!!!

Hi everybody,
Some one can help me to install ligggths on ubunto v 13.
many thanks,

DEM

Hi all
how can make particales with two different sizes(just 2 sizes: r=1 & r=2)in liggghts?
Thank you