How to make a square vortex ring! ft. 3blue1brown

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3Blue1Brown : Let's be honest, that vortex cannon had it coming with that smug look on its face.

Vladimir PutinYarbutt : Whoa! I thought 3blue1brown guy was like middle-aged man with like a bald spot

The Action Lab : Ok my question is how did you make the graphic of the wobbling square? Is that actually a numerical simulation using the Naveir-Stokes equation? Or is it just a graphic made to look like what you saw? Seems like a supercomputer would be needed if it’s real...

SmarterEveryDay : I concur with your decision to hand wave Navier Stokes

Physics Girl : You wanted that thumbnail, people. I hope you're happy. 😂

Physics Girl : Other interesting questions we didn't have time to explore in the video, but if you like reading here you go: - Why a ring going around a ball breaks apart. Every single time we tried, the ball would interfere with the ring, even if the ring was clearly much larger than the ball, as in 2:14. We kind of thought the vortex ring would expand over the ball, but finally realized that vortex ring is spinning so that the air on the inside of the ring is moving forward, so it drags against surface of the ball. Sad. - The leap-frogging rings at 2:17 were surprisingly hard to make because small currents in the air tend to send the vortices off an a different path. The reason they leap-frog around each other is the same reason hurricanes spin around each other as shown at 4:52. - We shot a smoke ring at a 1-inch pipe, a rope and a thin wire. The pipe killed the vortex. The wire passed right through the vortex with no effect. The rope sometimes killed the vortex ring, sometimes not, depending on how strong the ring was. We wanted to quantify this interference, but alas, I have to start working on a video about black holes. Get pumped. Thanks for watching, y'all! I love making these videos, especially when I get to play around with the science for a while and cool people join me.

Practical Engineering : So many great visuals :) Kudos to your graphic design team, and awesome idea with the laser.

Alex Wright : I've spent 8 years working on a PhD in this field and you.. just... youtube it out.

Alex_dlc : Wobbles from a C to a backwards C shape? Sooo... like an open parenthesis to a close parenthesis?

Adagio Elegy : Oh man it's physics girl and math boy!!!!

ANONYMOUS : 3b1b and physics girl 😲😲😭😭 this is the best thing that happened to me today 😭😭

Thomas : 3:58 As a 100% totally not lying "fluid dynamisist" expert, I can say that it is actually called a wawa woowoo- cc- ting bang quo quo quo behaiviour. True story.

Luke4Music96 : Well, one question remains for me... What about a triangle?

Drulludanni : What an awesome video, the cross section was really cool! on a side note, I always pictured Grant as like a 40 year old dude, funny to see that is not the case in person.

Andy Callaway : What about making a vortex cannon with, say, four holes instead of one, then see how the four vortices interact.

Otto Omen : I really love how Grant's (3Blue1Brown) voice is the same in real life as it is in his videos!

CozmicK G : 3blue1brown's face doesn't match his voice

Wayne Covell : 5:15 Merry Christmas

OkkaOK : Physics girl and 3b1b, i must be dreaming right now!

Precambrian Plushie : The laser thing is ridiculously awesome. Also, great thumbnail...

Robbi Rose : erm I like you and everything. But I think we should burn you at the stake. Just to be on the safe side.

Esteban AJA : CONGRATS! Forbes' 30 under 30. Well deserved.

Maris Dussartre : Prediction : with a square hole, you still make a ring.

Jacob Ferguson : Found the thumbnail lol😂it’s at 3:55

Steven Schmidt : You didn't say "happy physicsing".

Da Hai Zhu : Ok. Really Cool...but...a round vortex cannon through a square hole? Why not a square cannon with a square hole? Seem like you'd be more likely to get better defined square rings. Otherwise its like trying to shove a round peg through a square hole....

Ali Devrim OGUZ : Is it just me, or are you getting cuter in every new video?

Quahntasy - Animating Universe : Top 10 anime cross over. Absolute work of art. Loved it!

Orfeas Siozos : So you used the thumbnail face! AMAZING!

dandymcgee : Can we just pause for a second and appreciate whoever made the visualization at 6:00? I have no idea how you made it, but that is seriously freakin awesome.

Aurora Vuitton : Why am I stuck at 2:20 pondering about the leapfrogging rings

Miky Muky : My hypothesis for the square hole is that the vortex will still be a torus. I think that because knowing a vortex is created by air on the sides of an initial air movement spin back and then are fed back into the main center current creating a ring, because knowing that the circular hole is circular for the most homogeneous flow of air, the square means that the corners will output higher speeds of air and the edges will output slower currents of air. Because of that, the air current will quickly form itself into a cylindrical flow creating a torus-like vortex but slightly weaker. Edit after seeing the answer: It probably doesn't stabilize into a cylindrical flow and instead goes into a circle but the inertia of the current will bring the shape of the flow further into a square/diamond and then it collapses back towards a circle again.

David Wilkie : Seriously impressive Math-Physics, and proper fun! Very graphic techniques and imagination.

Tommy Callaway : Now to make a vortex cannon with several holes... hrmm

Zakiror Rahman : Hey Dianna I see a similar shape near a mushroom shaped cloud near a nuclear bomb

Charles Uwakwe : Hi Dianna, thanks for making these awesome video. You make learning so much fun! You are a really super cool scientist.

NetAndyCz : Well my guess is it will make circular vortex anyway, like if you throw square brick in water, the waves are circles. EDIT: Well, close enough I say:p Cannot predict all.

Enrico Vidal : Wuuuuut!?? That is soooo cool, damn I love physics!

GermanScience Labor : You wanted a prediction^^ here we go: I think the vortex cannon with a square hole has more trouble producing a stable vortex. See, the rings are spinning at every point equally fast when produced through a round hole, but when you use a square as outlet of the cannon, I think it is difficult to get a stable vortex, because the corners have more flowing material, which results in a pressure difference inside of the ring. Normally the round shape forms equal forces to cancel each other out very symmetric, but a square is a more complicated form, which could lead to instable vortexes. And the ones that form will quickly decay into a round shape, because of the differences in pressure. Just my assumption :D

Scientifically Explained : tye first 5 secs made me so excited to see the whole video till the happy physicing

Bananeisafree : That is the best question I never asked myself... Thank you for bringing this into our life !

Steve Phillips : More shapes! Triangle! Hexagon! :D

lPu_N . : Yeah ! 3blue1brown is here :D

Nighthawk Gliders : Great collaboration! You guys are incredible! That was awesome! Thank you so much! 👍😀

Suigetsu Hōzuki : This girl manages to be unfunny in a science video.

Eric Hopper : I predicted that it would work, but I thought it would quickly stabilize on a circle.

Gamal Khaled : I thought that when the vortex passes through the square hole it will form a wormhole because it makes more sense.

Paul Blaze : She is hot

Anna81303 : I love physics thanks to physics girl!

Callan Whitney : Physics girl and 3b1b! Dream team!