LIGGGHTS® - User Forum

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?

Hi,

For a specific simulation, I need to move a particle but prevent it from rotating. Using move command, you can specify linear velocity of the particle OR rotational speed, but two key words wont work at the same time.

So any suggestion how to move a particle but prevent it from rotation?

Thanks

Hi all,
After update to the latest 3.4 version, I found that mesh/surface feature maybe removed, because it prompts that:
ERROR on proc 0: surface mesh feature remove not available in this version (../surface_mesh_feature_remove.h:1)
Is this really? Removed permanent or temporary? How do I use a imported mesh as a wall alternatively?

Regards

Cheng

I want to store the properties (e.g. velocity and time) of all particles crossing a certain plane (e.g. a surface defined by a stl or the boundary of my computational domain). Can anybody give me a hint, how this can be realised?