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[Chiara Modenese <question178830@xxxxxxxxxxxxxxxxxxxxx>]

Question #178830 on Yade changed:
https://answers.launchpad.net/yade/+question/178830

Chiara Modenese proposed the following answer:
On 17 November 2011 13:45, Chareyre
<question178830@xxxxxxxxxxxxxxxxxxxxx>wrote:

> Question #178830 on Yade changed:
> https://answers.launchpad.net/yade/+question/178830
>
> Chareyre posted a new comment:
> "O.interactions.clear()":
> It will most probably break everything. As soon as collider stride is
> used, interactions are not created at each step, then particles will
> penetrate each other for a random number of steps without interacting. To
> overcome that you could disable stride. Overall, stride=off and
> deleting/creating all interactions at each step could well multiply cpu
> time by 10.
>
> In addition, the history of the contact is lost, i.e. the tangential
> force is lost, resulting in instabilities and artificial creep.
>
Yes, sorry for wrong suggestion. Killing the interactions is not the
solution (although this would not generate any trouble on the collider side
as Vaclav said).
Chiara

>
> Concerning the initial problem of wangxiaolang: Yes, increasing sizes is
> changing psd homotheticaly. If you want to impose not only the
> dispersion around mean size but also mean size itself, then you have to
> generate particles smaller than the target size. If you have target
> porosity  and target final size, it is not difficult to derive how
> smaller they should be initially. I guess you had to solve this problem
> somehow in your script, since you are also increasing sizes after all?
>
> Another (simpler but not perfect) option is to generate a packing of
> arbitrary mean size, then take all positions and sizes and scale them
> appropriately before using them as an initial geometry.
>
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