LIGGGHTS® - User Forum

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

I’m working for semester project in University. My task is to calculate the friction between rubber block and soil. My program is running but im not able to find output which required.

My idea is to insert particles in soil plate, compress it with top plate and rotate the soil plate against rubber sample.

1. Particles are inserted but when .stl file is rotating, particles are not moving along it.
2. I used ave\time to calculate the momentum. I thought to calculate friction from it using simple phyics law. But I didnt find where I can find ouput of the syntax.

Please help me.

How to make shared libraries for python on windows 10 ?

Plz see attached triaxial simulation

Problem : Particle are not compressing during the simulation.

Any COMMENT/help will be highly appreciated! Thanks

Hello,

I am trying to model a packed bed situation with a bottom wall of temperature 1000K and allow conduction through the bed. (This would involve inter-particle conduction as well).

I have been trying to add in a fix heat/gran/conduction value to allow for particle-wall conduction with no luck (no heat transfer happens at all). Can someone help me out? I am quite new to LIGGGHTS. I have attached my base code which has a heat source and sink which I do not want either - just conduction due to the heated wall.

Thanks