LIGGGHTS® - User Forum

HI,

This is the consecutive question of "FORCE ON MESH NOT CONSISTENT", https://www.cfdem.com/forums/force-mesh-not-consistent

It was told that the force on mesh should be averaged at least for 1000 time-steps.

What is the justification of the value of 1000 time-steps?

If I make the average with the different number of data, the statistics of the forces change a lot.

Would you give a hint for me to get the appropriate statistics of the forces on mesh?

Thanks,
Hakun

Please help!
I have run install.py with no problem. But when i try to test liggghts from python. It has two error:OSError:/usr/lib/libmpi_cxx.so1:undefined symbol:ompi_mpi_real ;OSError: Could not load LIGGGHTS dynamic library. I have run "make makeshlib" and "make -f Makefile.shlib auto" with no error. I don't know how to fix it.
PS:My system is ubuntu 16.04
THANKS in advance.
If you could help. Best Regards

I am trying to make my own CAD file similar to the chute tutorial. I can model in SolidWorks and export as ASCII stl file. I do not understand what is "insertion face". Why is that important? and how do i obtain that?

Hello,

I'm trying to compile/install LIGGGHTS latest version but I'm having problem as followings:

Hi everyone,

Is there anyone have successfully installed mpi executable of Liggghts-Public on Windows?
I tried several ways but none of them worked:

Hello,
I'm new with these kind of softwares. after some researches , I have found that it exists 2 software of LIGGGHTS.
The first; "LIGGGHTS" and the other one "LIGGGHTS-WITH-BONDS" ;
I wanted to know if there is a particular difference between these 2 ; and also , as i want to install this software , which one is the best ?
Do their installations differ from each other ?
Thank You !

Good morning,

Does anyone know which magnitude is used as the 'particle radius' for calculation of Rayleigh time-step of a multisphere representation?

Thank you in advance,

hi there,
I found out that there are 2 command that can give the heat flux of the particles:
1. fix heat/gran/conduction command
2. compute pair/gran/local command
And i guess the unit of both heat flux is energy/time (J/second). and i guess both of them are conductive heat transfer between particles.
So, what is the different between them?

P.S. i tried some cases, the output of these two command are different, although both of them named HeatFlux.
thx.

HI there,
I wonder if there is any example or tutorial to tell u how to calculate (or estimate) the effective thermal conductivity of a granular bed using LIGGGHTS?
thx

Hi,

I'm trying to find out contact between particles in huge size simulation which contain millions of particles.

What i'm using for this is

compute (name) (group name) pair/gran/local id pos force_normal delta

and then

dump (name) (group name) local (time step) (directory) & c_(name)[1] c_(name)[2], ... c_(name)[13]

But the problem caused here is when particle id is over 1 million, then particle id becomes 1.0e+06.

And it seems like ones place number is missing.