2021-03-11

[public] 678K views, 57.1K likes, 290 dislikes audio only

Steve Mould

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Have you noticed the shape of your urine stream when you pee? It does this twisty undulating thing. But why? And why do the same waves appear when you pour a liquid from a container?

Here's my video featuring Rayleigh instability:

/youtube/video/DvtbQs7hWXw

Here's my video about the Lattice Boltzmann Method:

/youtube/video/qwPg2Dmh-6k

The fake medical advice at the end comes courtesy of not-fake Doctor Rohin Francis. This is his excellent channel:

https://www.youtube.com/channel/UCgRBRE1DUP2w7HTH9j_L4OQ

Here are a couple of good videos on laminar flow:

/youtube/video/y7Hyc3MRKno

https://youtu.be/5LI2nYhGhYM

Image and video credits:

The video of water floating in microgravity is by NASA

The Lattice Boltzmann animation is by Richard Sear

You can buy my books here:

https://stevemould.com/books

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https://www.patreon.com/stevemould

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