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[Chareyre <question177419@xxxxxxxxxxxxxxxxxxxxx>]

Question #177419 on Yade changed:
https://answers.launchpad.net/yade/+question/177419

    Status: Open => Answered

Chareyre proposed the following answer:
Thanks for the paper!
Fig. 1 is an example of what I said: a simple rectangle arrangement can't describe a sheared media. They have to use the trick of shifting horizontaly the rectangles of the upper/lower layers, ok why not, but then it implies complex rules for moving the particles from one period to the other (see equations 1 to 4 + associated comments on the P, P', P'' problem, and also the velocity shift problem).

It terms of implementation it is horrible. You have to track each
particle to detect when it leaves a period and enter another, because
you must apply an instantaneous position jump to it. In yade, we don't
do anything special when the particle leaves a period. The other problem
is that a particle can have neighbors that are far away in the y
direction as soon as the neighbors are in different periods, it means
the AABB bounding cannot be employed.

You refer to large strains as if it was a problem, why? There is no
limitation of the current algorithms we have, and there are no specific
problems with large strains in DEM in general.

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