LIGGGHTS® - User Forum

Can anyone please tell me the name of the contact search algorithm used in LIGGGHTS-Public?? and how contact search algo is implemented in LIGGGHTS??

Hello guys,

I am fairly new to LIGGGHTS and DEM in general, so you will probably read my name a few more times in the future.

I created an input file and ran a few simulations where I insert particles using insert/pack in a box shaped region inside my domain to for a plateau. So far so good. In the next step I would like to use the end result of one of these simulations as the starting state for any following simulation, so that I don't need to waste precious simulation time on building the same plateau on every run. (I hope this makes sense so far.)

Hi everybody,

I'm using the easo model and am trying to monitor the liquid content of the particles. I read in an older version of LIGGGHTS documentations that the f_surfaceLiquidContent[0] command could work but it does not explain how. Any help regards this matter is greatly appreciated.

Thanks in advance.

I'm struggling to find a command that gives me the current timestep of my simulation. I'm trying to create a variable that depends on the current timestep of the simulation but for the life of me, I can't find any reference to such a command in the LIGGGHTS documentation.

Does such a command/variable exist?

Thanks in advance!

Hello everybody,

I have a question about the rotate keyword in the region command.
If I use the rotate keyword, is the region constantly moving or is it a stationary region, just rotated by v_theta every timestep?
And if I want to calculate the angle v_theta form the rotating velocity omega, how do I specify the time?

Thank you in advance.

Hello,

beforehand I am very new to this topic. I want to use LIGGGHTS and later CFDEMcoupling to simulate a coaxial rheometer which in theory is a hollow cylinder with a rotating inner wall.

My question: How do I create this geometry in LIGGGHTS without importing a mesh file?

My ideas were on the one hand to create two cylinder regions. For the outer wall an inward facing region and for the inner wall an outward facing region.
On the other hand an idea was to create a region inside the outer wall and create the inner wall with a fix.

Hello,

I am using LIGGGHTS to simulate heat transfer in a packed bed of particles. I decided to calculate the contact area with the overlap and with the area correction given by adding the original Young Modulus. This is feasible for the contact particle-particle.

Hi everyone,

I am solving a problem to predict the flow behavior of particles in screw feeder. The output of the code provide these values.

dump dmp all custom 1000 dump.screw id type type x y z vx vy vz fx fy fz omegax omegay omegaz radius.

In this what exactly is fx fy and fz ?? and if I want to compute the forces and torque in tangential and normal direction , how will i compute??

Hi everyone

How can the capillary force be extracted from the easo model for to get the output? (I didn't find anything in the search forums)

Please anyone can help me.

Thanks a lot

Hello,

I would like to track the time evolution of the number of clusters and the number of particles in each cluster during an impact simulation.

As a first step I use :

compute cluscoord all cluster/atom ${diam}

in order to identify the clusterID for each particle. However, I am wondering what would be the easiest way to count the number of clusters and the number of particles in each cluster.

Thanks in advance,