LIGGGHTS® - User Forum

I want to generate single particle with large radius like a tennis ball. I am trying with given command of particle distribution but not getting success.
Actually I have task to impact a large size particle into the pool of smaller particles (big particle size is more than 20mm and smaller particles have size around 2mm).

Is this okay if instead single particle I use cad stl file of sphere? I tried this also but as stl(sphere) falls domain boundary stretches , I can not use fixed boundary as in this case particles get lost.

Please tell me how do I proceed?

I am having difficulties trying to simulate biaxial rotation of an imported mesh.

I am looking the simulate the motion which occurs during rotational moulding where the mould (mesh in this case) rotates around two of its axis.
The current rotation commands within LIGGGHTS that I've found allows rotation to be set to the coordinate system in space but not to the mesh itself, which is where my issue lies.

Hi all,

I am new to this software. I am hoping to create a 100mm*100mm*100mm cube box with spheres inside the box and then applying confining pressure on all sides.

I have tried to import a mesh created from AutoCad (using other computer and copy back to my own computer) using the fix mesh/surface/stress/servo.
However, some errors are happened and the script is terminated.

Can anyone help with this? I have attached with my script. Many thanks.

Josh

Hi guys,

I want to add new pair style from the LAMMPS to the LIGGHTS.

So, I just copied .cpp and .h file to the src folder in LIGGHTS.

Then what should I do to recompile the LIGGGHTS?

I need specific description for recompiling. (I'm using LINUX)

Please let me know how to recompile the LIGGGHTS.

Hi All,

I am running a simple test case by shooting a single particle on an impact plate using different impact angles, velocities and mass.
At all the dependencies of the velocities and the mass are like expected. I just struggle with the results of varying impact angle, because in my case it doensn´t fit with the theoretical results i would expect by finnie. I attached a picture of the results of the simulation for the wear after impact and the curve i would expect for varying impact angles.

Hello,

I am trying to simulate the interaction (hertz) between a stl mesh (type 2) and an ensemble of particles bonded together (type 1).
I am using:

atom_style hybrid bond sphere
...
pair_style gran model hertz tangential history
pair_coeff 1 2
bond_style harmonic
bond_coeff 1 1000.0 200.0

Why do I get errors in the bond_coeff command? E.g. index out of bound or incorrect args for bond style (if I insert * instead of 1).
Thanks a lot and have a nice day,

rob1

i have typed : sudo apt-get install git
.
.
.
E: unable to locate package git

what should I do now?

Can anyone help me, how to move my wall for 3D consolidation simulation? Thanks in advance.

HI,
Can anybody help me how to find total number of slip events in a time step in granular simulation.
I tried adding a counter in pair_gran_hooke and also a compute flag in compute/pair/gran/local. But it is not working. Can anyone help please.

saikat

Hi all,

I am doing my master thesis (simulation of roller compaction-pharmaceutical powder).

I have verry big problems with high number of particles (mean diameter is 120 µm).

For 1 g of powder I need 700 000 particles. That is a lot because for filling volume of roller compactor I need "rough estimation" 20 milion particles.

So for that many particles I don't have proper hardware.

In roller compactor I must meausre density in specific regions (picture "Density measure").