LIGGGHTS® - User Forum

Hi, I am trying to add the Thornton and Ning contact model to LIGGGHTS-WITH-BONDS developed by richti. There are just way too many errors when compiling and I am unable to figure out an elegant way to add the Thornton and Ning model (from normal_model_thornton_ning.h in LIGGGHTS-PUBLIC-master) to LIGGGHTS-WITH-BONDS. Can someone please help?

Hello everyone,

i wanted to write the temperatures of the particles in a certain region into a text or csv file. Getting the mass, the number or other many properties of the particles in a certain region is possible easily with region functions, however i could not find any region function with temperature. For example for mass i wrote this and it works.

variable m1 equal mass(all,outlet)
variable t equal step*dt
fix data all print 100000 "$t,${m1}" file ../DEM/Messdaten/mass.csv title "Zeit(s),Masse_in(kg)"

Can I get little bit help?

I am doing simulation in rotating drum.
When I put my timestep to 0.0001 it is running without any problem. But I need more information about particles so I tried to make timesteps smaller which means 0.00001.
After decreasing the timestep , drum starts rotating while particles are inserting. And another problem is drum stops after certain timestep and particles move without drum's movement. Which is weird.

hallo everyone,

I would like to pack a mixture of two kinds of powders, 5000 for atom type 1 and 2000 for atom type 2. But the text file showed that there were only 5000 in total. Can anyone tell me how I can deal with it?

Best regards,
Sang

Hi,

Hello, I am using LIGGGHTS-WITH-BONDS and I would like to set my bond cutoff length as
cutoff = (R1 + R2) + G*(R1 + R2)
where R1 and R2 are the radii of the two particles and G is a value defined by me. How can I implement this into the line
fix bondcr all bond/create/gran 1 1 1 cutoff 1 26

Hello,

I am running the following code and facing some problem.

-------------------------------------------------------------------------------------------------------------------------------
#Simple chute wear test

atom_style granular
atom_modify map array
boundary m m m
newton off

communicate single vel yes

units si

region domain block -0.5 0.5 -0.5 0.5 -0.5 0.5 units box
create_box 1 domain

neighbor 0.2 bin
neigh_modify delay 0

Hello,

I am facing the following problem when trying to run the Ligghts.

Hello. when I am trying to install LIGGGHTS, I am facing the following problem. Can anyone point out that what is going on?

Hello,
I am a new user to both Ubuntu and LIGGGHTS. I am using ubuntu 20.04. I am facing the following problem during the installation. May I know where is the problem going on?