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Re: [Question #701221]: erase rigid boundaries and add periodic boundaries

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From: Jan Stránský <question701221@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 06 Apr 2022 07:20:50 -0000
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Question #701221 on Yade changed:
https://answers.launchpad.net/yade/+question/701221

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

have a look at periodic tutorial example [1].

There are a few essential commands:

enabling periodicity:
O.periodic = True

setting periodic cell size:
O.cell.hSize = Matrix3(2, 0, 0, 0, 2, 0, 0, 0, 2)

setting periodic cell deformation:
O.cell.velGrad = Matrix3(-.1, 0, 0, 0, -.1, 0, 0, 0, -.1)

The topic of switching from walls to periodicity was already discussed IMO, but I cannot find it..
Just be aware, that from the wall simulation, the sample is not periodic and putting it then to periodicity may have some "negative effect", mainly in the "non-periodic seam" region.

Cheers
Jan

[1] https://yade-dem.org/doc/tutorial-examples.html#periodic-simple-
shear

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