LIGGGHTS® - User Forum

Hello,

I'd like to know if in the latest release of LIGGGHTS is implemented the possibility to move a mesh through a periodic boundary condition.
It is mentioned a "very special context". Can you tell me more?

Thanks a lot and have a nice day,
rob1

A part of my syntax is given above.

#parameters for gradually growing particle diameter
variable alphastart equal 0.0001
variable alphatarget equal 0.000125
variable growts equal 50000
variable growevery equal 40
variable relaxts equal 20000

I want start particle insertion after a certain time. I assume this should work with the "start" keyword of insert/stream. However, even if I use the "start" keyword, paticle insertion starts from the beginning. My code looks the follwing:
fix ins nve_group insert/stream seed 5330 start 1e4 distributiontemplate pdd1 &
nparticles 10000 massrate 1e-1 overlapcheck yes all_in no vel constant 0.0 0.0 -1.0 &
insertion_face partIn extrude_length 1e-2
Can anybody give me a hint what's the reason why the "start" option does not work correct?

Hello all

I downloaded the LIGGGHTS code , but when I run a script on the examples, for example

liggghts*in.cohesion

(The * above should be the "less than" simbol. I cannot write it in this forum for some reason).

I get an error saying ‘liggghts’ is not installed. I do sudo apt-get install liggghts, but it keeps saying that ‘liggghts’ is not installed.

I followed the instructions on
http://www.cfdem.com/download-liggghtsr-public

Can anyone comment the right syntax for particle growth and shrinkage problem. I need to increase the radius of 200000 particles from 100 micron 125 micron.

Thank you

Hi all

We have dump image command liggghts which prints atom/particles at certain intervals in jog or png formats. The command may look like following:
dump dump_image all image 1000 png/image*.png type v_diameter zoom 1.0 view 90 90 size 1024 1024 axes yes 0.1 0.01

Hello,

I recently installed liggghts on my ubuntu OS, using
sudo apt-get update
sudo apt-get install liggghts

I am able to run simulations normally. Now, when I am trying to refer/make-changes to the source code, I am unable to find them. Can someone guide me, where I should look for the source of LIGGGHTS. I am in desperate need of this.

Thank You,
Yesawsi

Hi All,

I am trying to track the particle orientation during the simulation, I need to use that later on to specify the exact position of contact on the surface of the particle.

I took zamir's example (http://www.cfdem.com/forums/fix-nvesphereorientation) as staring point to my case and I tried to validate it but the output does not seem right to me when comparing the results in paraview with dump file, I don't know if I am missing something here.

In my model I want to analyse the velocities of particles when they cross a certain plane of my computation domain. By taking those particles out of the nve integration I can "freeze" them and have access to the velocity data when they pass the plane. However I have the problem that after a certain time the "frozen" particles block the plane. I think the problem is that particle-particle interaction is still active. Is it possible to turn off particle-particle interaction for the particles of a certain group and make the "frozen" particles invisible for later ones passing the plane?