largest number of particles and wear quantity goes infinite on wall

skyopener's picture
Submitted by skyopener on Tue, 11/15/2011 - 13:26

hello everyone,
I feel confused with some questions on liggghts,

#1. what is the largest number of particles can be simulated in liggghts? depend on the operating system?

#2. when particles contact with wall for a long time,. for example, when many particles were dumped into a container which was imported with STL file, the wear quantity of the all the walls of the geometry became negative infinity(-6E+6) after a long time's run. So if I want to calculate the wear quantity of an immersed surface, I have to import the immersed surface seperately?

Looking forward to your reply
thx.
S.L

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ckloss's picture

ckloss | Wed, 11/16/2011 - 10:13

Hi SL,

1) the particle number is stored as a double, so the max. number a double can hold is the current limit. However, in LAMMPS they have already extended that limit, so that will go into the next major LIGGGHTS release.

2) what obviously happens is an overflow. you could reduce the wear paramter, but simply the finnie model is simply not made for long-time contacts. so you will have to adapt the model

Christoph

skyopener's picture

skyopener | Wed, 11/16/2011 - 15:40

hi Christoph,
thx for your detailed answer.
I will dig into the code and try to modify it...
Best Regards!!
S.L