LIGGGHTS® - User Forum

LIGGGHTS® related topics can be discussed here: discussion about models, installation, feature requests and general discussion

Difference between LIGGGHTS and LIGGGHTS-WITH-BONDS

Submitted by Rimiggghts on Tue, 09/11/2018 - 11:57

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 !

Heat flux between particles

Submitted by B45034 on Sat, 09/08/2018 - 19:18

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.

Particle id is being approximated.

Submitted by fabregas04 on Fri, 09/07/2018 - 08:34

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.

Increasing Precision of Dump File

Submitted by estefan31 on Tue, 09/04/2018 - 03:15

Is there a way to increase the precision in my dumped files? When I use the write_dump command, it only outputs data up to 6 significant figures. I have a simulation with over 1 million clumps, and I need to know the id's of each clump. So after the 1 millionth clump, the id number rounds to the nearest 10. I am dumping .txt files, so maybe there's a better file format I could use? Or is it a LIGGGHTS issue?

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