LIGGGHTS® - User Forum

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,

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,

Hello, everyone,

I want to simulate contiuous materials, so I downloaded the package from https://github.com/richti83/LIGGGHTS-WITH-BONDS and copied it into the source file. When I compiled the package (type "make yes-bondspackage" in src), it said "bondspackage do not exist". Could anybody help me with that please? Could anybody tell me what correct steps are from downloding the package to running it successfully in 3.8? I really appreciate it.

Hi everyone

How to calculate the degree of saturation in gran cohesion easo/capillary/viscous model?
[Degree of saturation= a ratio of liquid to the total volume of voids in a porous material (soil) ]

thanks a lot and best regards
saman