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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