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[Chareyre <question186515@xxxxxxxxxxxxxxxxxxxxx>]

Question #186515 on Yade changed:
https://answers.launchpad.net/yade/+question/186515

Chareyre proposed the following answer:
Chiara there is no restriction on the rotation itself. You can rotate forever.
There is only a restriction on the maximum deviatoric strain. Be it for simple shear or other types of diplacement field (even if all non-diagonal terms of velGrad are zeros), it makes no difference.

For continuous shear flow, I see what you mean... You can plot it in a box with vertical boundaries but then this "window" is not periodic: below the bottom of this window, you won't find the top of the window. Hence it is physically not correct and, speaking of Yade, it breaks the collider's logic.
One solution is to shift the period back periodically (https://www.yade-dem.org/doc/formulation.html#approximate-collision-detection, see "flipCell"). There are still a few things to fix in the flipCell function, but theoretically it should work. 

To be honest, I don't understand the relation between Giuseppe's
question and you reply Chiara...

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