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[Jan Stránský <question294113@xxxxxxxxxxxxxxxxxxxxx>]

Question #294113 on Yade changed:
https://answers.launchpad.net/yade/+question/294113

Jan Stránský proposed the following answer:
Hi,


> All  i want to do is shear a sample without ceasing. I found that there
> would an error when the cell size in any one direction is smaller than 1
> times (or 2 times, i forgot) as the radius of sphere.  So, i mentioned
> the extreme condition that the lateral boundary becomes horizontal,
> which approximately indicates the maximum shear strain.
>

to use bodies larger than half of the period, see [1]


>
> Here, i have a gif that shows the solution of periodic shear obtained by
> others. http://imagizer.imageshack.us/a/img921/2930/w7fm25.gif
> Is any possible that we get a similar result using yade.
>

As Bruno mentioned, it is just visualization trick. In Yade, the particles
are displayed in skewed periodic cell [2]. But in postprocessing stage, you
can shift some particles by the k*period to make them look like being
inside a cube (like your image).

cheers
Jan

[1]
https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.InsertionSortCollider.allowBiggerThanPeriod
[2] http://yade-dem.org/doc/tutorial-examples.html#periodic-simple-shear

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