LIGGGHTS® - User Forum

Good Day,

If I have some in.script.sh with a variable

variable a universe 2.0 4.0 6.0 8.0 10.0


Using the code


shell mkdir post_$a
next a
clear
jump in.script.sh


The jobs run one after the other (series). What can I do if I want the jobs to run simultaneously (parallel)?

Thank you.

I am thankful for Christian's contribution for visualizing the superquadric particles on previous posts.

The issue has been well solved. And the youtube link for the video could be found as

https://www.youtube.com/watch?v=T-qAggZhfzo

However, I find it is hard to visualize the superquadric particles with different size distribution. Any suggestions are appreciated.

Kind regards,
lumb

Hi All,

In my CFDEM case I have to insert thousands of particles for that I am using "include" command and I am writing small python script to generate coordinates of particles. With only LIGGGHTS script it works properly but with CFDEM case it does not work. Error is "can not open the script" on include command.

Hello all,

Why in LIGGGHTS the cohesion density energy is in J/m3. When Johnson-Kendall-Roberts theory say that is the surface energy, and that is in J/m2?. What is the relation betwen both of that definitions?. Because in the literature the definition of the cohesion energy density is other than the adhesion, and that is related with chemestry, it seems here is a mistake in definitions. So, the process to calibrate this values with experimental data is confuse.

Please say to me what paper could I can read for understand the approach did for LIGGGHTS with this terms

Thanks

I want to count two sizes of particles separately with fix massflow/mesh command. I thought it should be very straightforward but I didn't figure out how to do that.

Thanks and best regards,
Min

Dear all,
I want to impose an isotropic compression on a granular sample. I am trying to use the servo wall for it. But in spite of many test (playing with KP, KD, KI,mode auto, etc) the walls are not getting the fixed force and also not moving. I am attaching an example script and the related cad file, in case any of you can help me.

Hello,
I installed LIGGGHTS WITH BONDS and I have problem with the visualization of the example.
I found program bondsfalloncone and I ran in.template.
https://github.com/Polyun/LIGGGHTS-PUBLIC/tree/master/bondspackage/bonds...

In this program, parameters are write to output file by command:
dump dmp all custom 250 post/dump*.bondcone id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius

Hello,
Can anyone tell me how to get the elastic potential energy due to the particle-wall contact. pe/atom or pe gives only gravitational potential energy. (RESTRICTION: This compute does not include the potential energy due to the overlap of granular particles.).
There is an option 'computeElasticPotential' as a keyword for the hertz contact which saves the elastic potential energy, but I don't know how to use the saved value.
My wall is not a primitive wall it is a mesh.
Can anyone guide me through the procedure?
Thanks in advance.

Hello Liggghters,

I am trying to understand the physics behind the tutorial of Hydrogel_multicontact but while lunch it give me the following error attached in the log file below how do I make work ??

Salutations,