LIGGGHTS® - User Forum

Hello
I am relatively new to LIGGGHTS-flexible fibers, and I don't understand the effect of neighbor settings quite well. My model has particles of diameter 30e-6 m. Simulation box is cubic with edge of 1000 * particle dia.

When I run with following neighbor settings on my PC:, it runs fine
neighbor 0.001 bin
neigh_modify delay 0 one 5000

Hello!
I have been trying to use the gaussian curvature for the force calculations between two superquadric particles. To do so , I have used the command :

pair_style gran model hertz/stiffness  surface superquadric gaussianCurvature yes tangential_damping off

However , the radius that it is using for the forces calculations is the same as volume equivalent radius. Similarly I tried with meanCurvature yes and with CurvatureLimitFactor as more too , but even then the volume equivalent radius is being used...

Hi
I have re-installed LIGGGHTS-flexible fibers version (https://github.com/schrummy14/LIGGGHTS_Flexible_Fibers.git) on my win10 pc using Ubuntu app. After compilation I am able to run the tutorial examples, however, when I try to run model for my problem, I get the following error.
Strange thing is that I was able to run the same code before. Also, my PC has 12 cores but I am not able to allocate more than 5 cores for the run. All the above problems were not there previously.

Dear LIGGGHTS users,

In my granular systems, the largest particle diameter is 50 times the smallest particle diameter, and it is inefficient to use a single set of bins. For example, the simulation time of a mono disperse particle system is much shorter than that of binary particle system with the same particle number.

Do the restart/write_restart and read_restart commands reset the atom IDs?
So, will a particle with a certain ID have the same ID if I am continuing my simulation using read_restart?

Best regards,
Azamat

Hello Liggghts forum,
I tried to save some variables in csv format which are mentioned below.
While running simulation,
I got an error.
I think I did mistake while including ' jump command and label'

Could you kindly help me to solve this problem?

Thank you so much

Hi. I have been trying to use six servo-controlled mesh walls to prepare an isotropic sample with a target pressure of 100kPa but encounter an issue that I could not prepare a "stable" sample.

Dear LIGGGHTS users!
I want to use the variable command to include and exclude the specific particles from a group, and I used the similar commands like that in the Docs as following:

compute 1 all pe/atom
compute 2 all reduce sum c_1
thermo_style custom step temp pe c_2
run 0
variable eatom atom "c_1 > -3.0"
group hienergy variable eatom

Dear LIGGGHTS users,

I am simulating packing systems with a very wide range of particle size, and use "neighbor 0.002 multi"+"communicate multi vel yes". However, the output kinetic energy and pressure are both zero. When using "neighbor 0.002 bin"+"communicate single vel yes", the output kinetic energy and pressure are not zero.

Could you please tell me the reason?
Any help will really be appreciated.

Best wishes
June

Apologies for the same issue again.

According to error I know that I have to change my particle insertion region but I couldn't figure it out right region in my simulation. i am totally stuck here.
It would be a great help if anyone could let me to know the idea to fix my error.

Error: