LIGGGHTS® - User Forum

Hello every one...
i used Hertz contact model in my simulations in following form:
F=(Kn δn- γn Vn ) + (Kt δt- γt Vt )
The first term represents the normal force between two particles while the second term represents the tangential force. Here Vn and Vt are normal and tangential components of the relative velocity. The coefficients K_n, K_t, γ_n, and γ_t are calculated from the material properties.

Hello guys

I wrote this code :

atom_style granular

#atom_modify map array

boundary p p p

newton off

communicate single vel yes

units si

region reg block -0.005 0.005 -0.005 0.005 0.0 0.03 units box

create_box 2 reg

neighbor 0.002 bin

neigh_modify delay 0 contact_distance_factor 1.5

hard_particles yes

Hello!

I am receiving an error when simulating a case with fix viscous command. I will attach the script file. The simulation itself goes normally but after I create vtk files from dump files and open them in Paraview I get the following message:

Hello everybody.

Hello everyone,
I just want to know more about the possibility of Lees-Edwards boundary condition implementation. Actually, this BC is a mixture of periodic boundary condition along with the simple shear flow. So how it can be done in liggghts?
Thank you, in advance for your help.

Hello,

I am working on discharging particles from a flat bottom hopper with an orifice. But even I keep particle frictions low one layer of particles seems to stick to the wall surface of the hopper. Even if I reduce time step and increase Young's modulus the result is the same.

Can someone please help me about that?

Here is my input script:

atom_style granular
boundary f f f
newton off
atom_modify map array
communicate single vel yes
units si #(meters, seconds, kg)
timestep 0.00001
processors * * *

Hi,

I'd like to modelling the cement bonds by using parallel bonds which consist of a finite-sized beam between the two particles. I do not know the structure of LIGGGHTS system, so here is the light questions.

#1. Is there any method that I can use the codes provided by someone else in github or somewhere? and non-specialist can do that? I think it is a quite difficult work because I have to change from the source code.

I am trying to convert a 3D simulation of granular flow that includes STL objects into some form of periodic or true 2D simulation in order to reduce run times. I'm hoping someone can point me to an example or to documentation specific to true 2D simulations or to simulations that include a single periodic boundary condition.

I had no luck with my attempts to set "dimension 2". LIGGGHTS complains that my grains are 3D objects.

Can one use LIGGGHTS for pharmaceutical coating application?

hi i cannot get the atom charge or electric charge in my dump files even after adding q to it all i get is zeros if someone could help i'd greately appreciate it thanks

dump dmp all custom/vtk 100 post/fall*.vtk id type type x y z ix iy iz vx vy vz fx fy fz q omegax omegay omegaz radius