LIGGGHTS® - User Forum

I want to simulate contiuous materials, so I downloaded the package from https://github.com/richti83/LIGGGHTS-WITH-BONDS and copied it into the source file. When I compiled the package (type "make yes-bondspackage" in src), it said "bondspackage do not exist". Could anybody help me with that please? Could anybody tell me what correct steps are from downloding the package to running it successfully in 3.8? I really appreciate it.

Hi everyone

How to calculate the degree of saturation in gran cohesion easo/capillary/viscous model?
[Degree of saturation= a ratio of liquid to the total volume of voids in a porous material (soil) ]

thanks a lot and best regards
saman

Hi All,

I am dealing with an error I hadn't seen before and it seems to be unlisted.

My simulation consists in a 20cm long tube and 3cm diameter, at the moment I have a single particle running along the tube with periodic boundary. I used GMSH to create the geometry and mesh of the tube.

The simulation itself is simple, simple geometry, simple distribution, simple output. I run the simulation in serial first and I did not know what the problem was. Then I run it in parallel and I obtained a little bit more of information:

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LIGGGHTS (Version LIGGGHTS-PUBLIC 3.8.0, compiled 2019-01-23-05:33:02 by root, git commit unknown)

atom_style superquadric
ERROR: Invalid atom style (/build/liggghts-hYaheD/liggghts-3.8.0+repack1/src/atom.cpp:459)

I made the necessary changes in make file but still i m getting the issue. please suggest something.

Thanks in advance.

Hello,

Anyone know how to run simuation in parallel computing with workstation?

Its tried mpirun -np 128

but its showing node: imk****
Executable : LIGGGHTS

Your help is much needed.

Thank you

Hello Everyone,

I am trying to re-compile LIGGGHTS-PUBLIC after applying some modifications to cohesion_model_sjkr equation but I am getting following error:

Hello Community,

I'm working with liggghts for a job at my university. This work examines the contact surface between particles and the wall.

I have created a particledistribution with 4 different atom types and would now like to determine the tensions between the wall and the individual atom types.

For this I tried to combine a dump-stress command with a group assignment, but unfortunately this doesn't work.

dump dmpAllMesht1 t1 mesh/vtk 10000 post_hertz_ver/t1/t1_stress*.vtk stress window

I used the following command in OpenFOAM to get the stl file.
surfaceMeshTriangulate -patches '(walls patch2 patch3)' walls_new.stl

Hello,

I want to insert particles in cad files. after that compress it and rotate it. When I'm trying to execute the program. particles are falling down to cad files. .Plate is not rotating. Can anyone help me . Please find the code below:

### Initialization

# Preliminaries
soft_particles yes
units cgs
atom_style granular
boundary f f f
atom_modify map array sort 10000 2.0
neigh_modify delay 0 every 1 check yes page 500000 one 50000
newton off
communicate single vel yes
processors * * *

When using the "gran surface multicontact" my simulation crashes for no apparent reason and Liggghts does not output an error.
I'm using the latest Liggghts that I built myself on Windows with MSMPI and vtk

When running with a single processor, the visual C++ error popup says: "cannot dereference end list iterator"
An image of the error is attached.

I've also attached my script as a reference