yade-users team mailing list archive

[yuannian wang <yuannian_w@xxxxxxxxx>]

Hi, Janek:
  Thanks a lot! We are planning to use SDEC for a study about impact fragmentation because we found via public papers that this program have been validated well for some specific problems including triaxial test. So I think there must be a packing method used to prepare the specimen, while as you said which is not included in the current YADE version. As I know, gravity method will consume much heavier computational time than other methods but it's more direct and easy to realize. 
   
  Could you let me know where can I get the previous version of SDEC if it's an open scourse? Thanks again and discuss with you later!
   
  Yuannian Wang

Janek Kozicki <janek_listy@xxxxx> wrote:
  yuannian wang said: (by the date of Mon, 5 Jun 2006 22:25:28 -0700 (PDT))

> Hi, all:
> This is a new comer to the community. When I try to go through your
> SDEC code, I just can't find the part for packing (sphere packing 
> together before you prepare your sample simulation). Where I can figure
> out that ? And if possible, could you guys please tell me which type of
> method it used like gravity or fill-expasion method? Thanks!

Hello,

This question should be asked on yade-users mailing list, So I'm
answering here. List yade-dev focuses on framework development, and is
intended to use by people who write yade (yeah, not much happeninning
currently there ;)

Currently there is no spehre packing code in yade at all. A gravity
method was used currently to circumfere this problem. A speciemen is
generated, with speheres positioned randomly, then the simulation is ran
for quite a long time, until all the speres settle down due to gravity.
But this is not the Right Approwach (TM), because there are many
optimisations possible to generate a speciemen packed with spheres.

I'm not sure, maybe Bruno has written something to acheive sphere
packing - he badly needs that, because he works on triaxial test. If yes
- I'll gladly add this to yade (as well as all the other work) :)

To summarise - there is no sphere packing code in yade yet. Gravity
works 'by itself' because it's the part of runing the simulation.

If you want to code a sphere packing method, you are very welcome to :)

-- 
Janek Kozicki |
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