LIGGGHTS® - User Forum

Dear all,

I am trying to add image support to LIGGGHTS. Based on the instructions found in the documentation, I believe I should be able to add the following lines to the Makefile.user file:

LMP_INC=-DLAMMPS_PNG
JPG_INC=-I/opt/pkg/filelib/libpng/1.6.34/gnu/7.2.0/64/opt/include/libpng16
JPG_PATH=-lpng
JPG_LIB=-L/opt/pkg/filelib/libpng/1.6.34/gnu/7.2.0/64/opt/lib

However, when trying to compile LIGGGHTS, I recieve the following error:

I have tried to push the v3.7.0 with BONDS (provided by Mr./Dr. m*****) to v3.8.0.

And I have met some issues. One of the key issues is how to set the random seed in fix bond create. Does anyone has experience on solving this issue?

Thanks!

Hi

I need to dump the local contact information between the particles for every step during the simulation.

But the whole script is in the loop for variable $a
Problem These particular compute (pair/gran/local) command is giving the error as follows
ERROR: Compute pair/gran/local (id cpg2): Need to define this compute before first run (../compute_pair_gran_local.cpp:127)
However the for variable equal to 1, script working fine, the problem starts with the next value of the variable

Hi all,

After I compile LIGGGHTS with make auto command and copy the lmp_auto into example/chute_wear, the mpi process had a segmentation fault which is :

Hi,

I am new to LIGGGHTS. I am looking into the example input script given in the LIGGGHTS documentation. I can see that the 'region' command was used twice in the input script. I do not understand why the 'region' command was used twice. What was the purpose of using the 'region' command twice? I am adding the example input script below. It will be a great help for me if you can explain the reason behind using the 'region' command twice in the input script.

Hi everyone!
I am working on a simulation that involves a rotating drum and I've been investigating between the different output I get when I set its rotation using the two commands I mentioned.
In particular, I am interested in the total force acting on the particles, therefore I used in both cases the mesh/surface/stress fix-style and I noticed that it leads to different results in both forces and trajectories of the particles.

Hello everyone
I am trying to conduct triaxial test using LIGGGHTS. My boundary is a cube made up of six STL files ,the size of one STL file is 0.2 meter. In the begining, they are crossed with each other, and particles are inserted in the center region, a cube with side length of 0.1 m.
I used servo command to accomplish isotropic consolidation.After that, I compute wall's position, unfix servo wall and fix new wall on the top and bottom.Using move/mesh command to move the top and bottom walls while lateral walls remain servo walls.

Hello,
I would like to have create a vector (myVec) and be able to call individual values in an input script

Something like the following.
variable myVec (I have No Idea) [1,6,2,8,4,7]

variable singleVec equal ${myVec[2]}

I see that we can input an environmental variable and use it in the liggghts script but I would like to keep it contained in an input script.

any idea?

Dear all

I am doing triaxial test simulation, but I am facing some problem.

1. First, I applied six servo controlled wall using command to execute a confining pressure on a cube soil specimen, with the following command.

cohesion model consist of cohesive energy density as one of the input parameter. Based on the number of particle how to change the cohesive energy density value. What is the basis for calcilation of cohesive energy density?