LIGGGHTS® - User Forum

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?

Hey guys,

Hi guys,

I am going to simulate a number of lagrangian bubbles in eulerian continuum fluid phase using CFDEM-LIGGGHTS-OPENFOAM. I have installed CFDEMProject with LIGGGHTS and OpenFOAM-Paraview.

Can anyone help me by telling is that possible or not and if it is possible, which solvers in CFDEM i should use. And how should i proceed step-by step to do the simulation.
If openfoam can do this, please tell which solver and files in openfoam can do that.

Hello,

I know I recently opened a topic but I think this question requires another discussion.

I am trying to run simulations of fine powder, with particle dimension described by a Gaussian distribution with mean value of 50 microns.

I want insert a plate, restrain it in Z direction, and load with a force, but I want the force just loaded in part of the surface of the plate. Could I realize this idea in liggghts ?

Hello,

I recently started to use LIGGGHTS.
I am trying to optimize as best as I can the script to run the model. Since some locations of the domain of the simulation are never occupied by particles, I thought to split the domain in multiple partitions, allocating less CPUs for those partitions where particles never go.