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Extended peridic boundary conditions by cell flipping

 

Dear all, this may be of interest for the users of periodic boundary conditions. Shearing continuously without meeting the "body larger than half-period" problem is now possible with cell flipping [1,2]. There is no restriction to the magnitude of the shear, as shown by the new example script [3].
Bruno

[1] https://yade-dem.org/doc/formulation.html#approximate-collision-detection
[2] https://yade-dem.org/doc/yade.utils.html#yade._utils.flipCell
[3] https://raw.githubusercontent.com/yade/trunk/18967378d36cf71adbe1b9db263c081f7f1b2771/examples/PeriodicBoundaries/cellFlipping.py

Relevant commit, fixing flipCell() (see also a couple commits after this one):
https://github.com/yade/trunk/commit/2d7afba3ee2405351a0a48b15ff3d47703ab1849