Am 28.05.2024 um 00:34 schrieb Bald Eagle:
> So, I was just stirring some boiling water to make some pasta, and the vortex
> was actually 5-sided, with the water from the preceding side apparently sliding
> underneath the next.
> 
> Things like this are becoming increasingly hard to research, as web searches
> aren't what they used to be.  Like finding "troposkein".
> 
> Might anyone know of a mention of this in the mathematical, geometric, or
> physical science literature?   Seems like it would be a cool 3D curve to make -
> once I have the requisite round tuits.
> 
> - BE
> 
> I found some papers may be related to this question. But I'm far away 
from a deeper insight in this matter. First:

https://journals.aps.org/prfluids/pdf/10.1103/PhysRevFluids.4.100507

But as I understand it, the authors have only speculations about the 
reasons and the setting seems to be not exactly the same.

May be a related phenomenon:
https://arxiv.org/pdf/physics/0511251#:~:text=In%20a%20flow%20driven%20by,from%20that%20of%20the%20plate.

In the following paper the authors try a numerical approximation of the 
second phenomenon (as I understand this stuff):
https://www.mdpi.com/2076-3417/11/3/1348

BTW, more work in the kitchen besides boiling water you will find with 
google and a possible German translation of 5-sided vortex (5-eckiger 
Strudel ;)

Best regards
Michael

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