LIGGGHTS® - User Forum

Dear all,

I cannot find the bug in my script. Please help me, because I don't understand, why there doesn't appear any repulsion of my particels after falling on the ground.

Here is my little script:

dimension 2

atom_style granular
atom_modify map array
boundary m m p
newton off
echo log

communicate single vel yes

units si

region reg block -0.03 0.03 -0.03 0.03 -0.0002 0.0002 units box
create_box 1 reg

neighbor 0.002 bin

neigh_modify delay 0

#Material properties required for new pair styles

Hello,

Probably a really simple question... but when you initially insert a mesh, where does it place it originally before any offset is applied? At the origin of the simulation region?

I am just trying to understand how it inserts so I know that my mesh is placed correctly. I have looked at the fix mesh/gran help file but it doesn't say how it picks the point of reference of the inserted mesh and if the point of reference in the region is indeed 0 0 0.

I used solidworks to create the STL file if this is of any use in answering my question

Thanks

Jay

Hi,
I am doing simulation and printing out temp of granular particles but it displays very high value, I dont understand its meaning. Can anybody guide me?
Value output on screen (in fifth column) :

61000 2360 0.0032032676 0.00055331777 3.8438666e+16 0.001189728
62000 2360 0.0067480441 0.0004580142 7.3734852e+16 0.001189728
63000 2360 0.0094283732 0.00042055652 1.0077762e+17 0.001189728
64000 2360 0.0098094931 0.00042700973 1.047434e+17 0.001189728

I used these commands for computation of temp.

compute T all temp/sphere
and then:

Hello Christoph, hello all,

I am supposed to help to administrate a computing cluster and we are using liggghts and would like to stay up-to-date using git. For some reason we have problems accessing the git repository:

>git clone git://cfdem.git.sourceforge.net/gitroot/cfdem/liggghts myliggghts
Initialized empty Git repository in /home/hoefert/programs/test/liggghts/myliggghts/.git/
fatal: Unable to look up cfdem.git.sourceforge.net (port 9418) (Name or service not known)
fetch-pack from 'git://cfdem.git.sourceforge.net/gitroot/cfdem/liggghts' failed.

Hello.
How to generate a stress-free random dense packing with prescribed porosity and radius distribution? Is there some hints?

Hi,
I want to rotate a cylindrical mesh along y-axis. It is not rotating along axial direction but rorating some point outside the cylinder:

fix cad all mesh/gran/stressanalysis STL.stl 3 0.01 -40 -20 -50 90. 0. 0.
..
..

fix rotcad all move/mesh/gran rotate 0 0 0.0 0 1 0 0.5 cad

How to make it still( no translational motion), just rotating along axial direction?
Thanks for advising me,
Ram

Hello.
How can I enable / disable the friction during the simulation?
I want to generate an initial package without friction, then the friction enable and continue the simulation.
Thanks.

Hi,
fix pour/dev/packing can be used with STL file. I mean i put STL mesh in box and then apply this command for packing. Is it valid way of doing? I guess this command uses whole simulation box for inserting particles including STL.
Thanks,
Ram

Hi,
I want to pack particles of two different diameters (0.003 and 0.0034). Starting from lower values of diameters. how can I confirm that after growing radius the final form of packing consists of the required diameters?
Thanks for help,
R

Hi,
I am a newbie to Linux and LIGGGHTS. I'd appreciate if anyone can tell me how to upgrade LIGGGHTS from old 1.1.10 to the latest version. Thanks!

Lenard