number of particles and packing

raguelmoon's picture
Submitted by raguelmoon on Thu, 09/16/2010 - 08:09

Hi LIGGGHTS users,
I used fix pour command and inserted particles with low number per insertion. Box is filled with 1/5th of the whole. Total number of particles is 30,000 with diameter 0.005m. However, when I filled the same system with other fix pour commands and increase the pouring number then it fills whole box. What is wrong with it?
Thank you in advance for help...
Ram

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ckloss's picture

ckloss | Thu, 09/16/2010 - 08:52

Hi Ram,

not sure if I totally understand your question, but fix pour is the old LAMMPS command which is provided for backward compatibility. The newer fix pour/dev and fix pour/dev/packing are better optimized for polydisperse packing - thats why you can reach a higher packing density

Christoph

raguelmoon's picture

raguelmoon | Thu, 09/16/2010 - 18:19

hi,
I mean the box is filled up when i use fix pour/dev command and not filled up fully when i use fix pour only; however the number of particles are same in both cases. By using fix pour, the box is filled up 1/5th of whole box, while in other commands, the box is filled up entirely. So big difference....!!!! 30,000 particles occupy small space in one case and big space in the other...!!!!

Best,
Ram

Ram

ckloss's picture

ckloss | Thu, 09/16/2010 - 18:35

Have you used the same particle size? Note that in case of pour/dev, you specify the radius, and for pour it's the diameter.
Otherwise: can you post the relevant commands from the script?

Christoph