LIGGGHTS® - User Forum

I am attempting to modify the auger tutorial script to use superquadratic particles and I am running into the following error: Invalid attribute in dump custom command (../dump_custom.cpp:146). I believe the error is related to the dump syntax. Any help and suggestion is greatly appreciated. I have attached the input file and the relevant geometry folder.

Hello everyone;
I am trying to validate my numerical model with previous model. Therefore, I am trying to generate 6614 particles into the region 0.028 x 0.0054 x 0.0576, which the particle bed porosity is 0.39. However, I cannot obtain the same result.
LIGGGHTS inserted less particles than requested and my porosity is much higher than model in previous study

Hi Everyone!

When i use the "compute pair/gran/local" using the following:

compute cpgl all pair/gran/local pos id force contactArea
dump dmp_cpgl all local 1000000 output/fc/cpgl*.dump c_cpgl[1] c_cpgl[2] c_cpgl[3] c_cpgl[4] c_cpgl[5] c_cpgl[6] c_cpgl[7] c_cpgl[8] c_cpgl[9] c_cpgl[10] c_cpgl[11] c_cpgl[12] c_cpgl[13]

The above works perfect for me!

However, if i would like to know the coordinates of the contact point at which the force is calculated, i need to use the following:

Hello everyboday;
I am working on irregular particles. I clumped the particles together by the fix multisphere command. I use Paraview to visualize the irregular particles but the rendering image is not good. It is hard to see the shape of particles. I am wondering if there are plugin of Paraview or other programs that can help me to visualize the shape better?
Thank you

Is there a way to have a group of particles being skipped by collision detection and locked in place, ideally while reducing the computation time.

A simulation that I'm running involves filling a tall cylinder with particles and I want to ignore the majority of them and only freeze a certain distance from the top for the next layers.

Simulating the entire stack is not feasible computation time wise on my desktop.

I haven't been able to find functionality like this in the documentation

Thanks,
Alex

Hello,
I am very new in the field of LIGGGHTS. I have already installed LIGGGHTS 3.7.0 version. But I have to work with atom type superquadrics , I have installed the version 3.8.0 too. But while I am simulating the case. It was creating the 3.8.0 version environment. Please tell me how can I change the environment??
Thanks in advance

Hi,
I am trying to simulate a cold hollow sphere mesh surrounded by hot particles. I am using the mass_temperature tag for this, but when I dump the mesh temperature, it doesn't change with time even though the surrounding particles are at a higher temperature than the mesh. Does anyone have any idea if this feature works in LIGGGHTS?

syntax used:

fix cad2 all mesh/surface file Indium226mm.stl type 2 move 0 0 0.007 temperature 300 mass_temperature 0.35

dump meshtemp all mesh/vtk 500 temp*.vtk temp cad2

Thanks!

How to install Liggghts-Public on window 10.

Hi everyone,
I'm simulating a rotating drum and I want to compare the results I obtain using this three methods :
Imposing rotation by using fix move/mesh
imposing rotation by using fix mesh/surface surface_angle_vel
imposing a rotating gravity.

I am trying to generate a relatively large number of bonded conglomerates. However, I need the individual conglomerates to remain unbonded from each other. Is there a way to read in a text file with a specified bonded conglomerate in a way similar to multisphere? Or perhaps define bond creation based on material location at a given time step?