LIGGGHTS® - User Forum

hello all,
I was going through the internal codes of Liggghts and found that tag and mask variables are set for each particle. can anybody kindly tell me what are those? As far I understood is the tag is the unique id for each particle and the mask is the processor number in which a particular particle's information is stored. kindly correct me if I am wrong.
thanks in advance.

Best,
Tarun

EDIT: issue has been solved, numerical inaccuracy on my part

SORRY

Total # of neighbors = 3481808
Ave neighs/atom = 17.4315
Neighbor list builds = 118828
Dangerous builds = 0
ERROR: Invalid dump style (/build/buildd/liggghts-3.0.3+repack/src/output.cpp:574)
dem@LIGGGHTS:~/Documents/litgg$

any one please help rectifying this error.

can anyone help me with the input script for providing different growth rate for two particles.

Hi,

I am trying to install LIGGGTHS. I saw that VTK must be installed with support for MPI. I did it, and when trying to install LIGGGTHS again I get the following errors.

Is there any way to modify the servo wall fix from:

fix servo all mesh/surface/stress/servo file plate.stl type 1 com 0. 0. 0. ctrlPV force axis 0. 0. 1. target_val 10 vel_max 1. kp 5.

to:

fix servo all mesh/surface/stress/servo file plate.stl type 1 com 0. 0. 0. ctrlPV torque axis 0. 0. 1. target_val 10 vel_max 1. ratio 0.01 mode auto

in between two runs?

Hello all,
I have a question about my code. I would like to simulate a shear test.
During the insertion of particles I got the following error
"ERROR on proc _: assertion failed (../region_neighbor_list_I.h:170)"

But if I increase the size of my domain following the z-axis the problem is solved.
You will find the file in the attachment.

The size of the box region :
region ri block 0.0 0.02 0.0 0.02 0.0 0.001 units box
(The problem is solved wiht region ri block 0.0 0.02 0.0 0.02 0.0 0.014 units box but I have too many particles)

Hello everybody,
I need to import the particles created by LIGGGHTS to CAD software. I have defined a simulation box with all faces as walls and put some particles on it. When I dump the last frame outputs as a .stl file, nothing save in the file and CAD software show nothing. Should I mesh the particles? if yes, how?
I appreciate it if you help me.
Kind regards,
Mehran

Hi,
I am trying to implement a nested loop in the following manner.

label loop
variable a loop 10

#variable level equal 200

label loop
variable b loop 200

variable tar_loading equal ${sigma_3}*${sample_width}*${sample_width} + 0.5*$b*${sample_width}*${sample_width}

# APPLING LOADING
fix_modify twall_servo servo/target_val -${tar_loading}
run ${load_unload_step}

next b
jump SELF loop

label loop
variable c loop 180

Greetings,

I modeling a clogging process in a biological filter and I want a color map of concentration of particle per cell or a number of particle per cell. My simulation have bigger particles that filter the small particles and I want to evaluate where the small particles get stucked.

Thank you already,
Kesley