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Re: [Question #696786]: Strange behavior: sand pile settles in a squared shape ?

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From: Jan Stránský <question696786@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 27 Apr 2021 15:05:49 -0000
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Question #696786 on Yade changed:
https://answers.launchpad.net/yade/+question/696786

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hi Luc,

have a try with lower NewtonIntegrator.damping.
For zero damping, I would say the settlement is visually circular - although a more rigorous than "visual" metric should be defined for serious conclusion.

The numerical damping is computed not "isotropically", but component-wise and is therefore is "clearly non-physical, as it is not invariant with respect to coordinate system rotation" [1].
It could result in different behaviour along axes and "between" axes, resulting in "square-shaped" settlement.

Cheers
Jan

[1] https://yade-dem.org/doc/formulation.html#numerical-damping

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