Turbulent Flow is MORE Awesome Than Laminar Flow

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Everyone loves laminar flow but turbulent flow is the real MVP.
A portion of this video was sponsored by Cottonelle. Purchase Cottonelle Flushable Wipes and try them for yourself: bit.ly/2WJm9Hq

Special thanks to:
Prof. Beverley McKeon and team www.mckeon.caltech.edu
Destin from Smarter Every Day jpvid.net/u-smartereveryday
Nicole Sharp from FYFD ve42.co/fyfd
Pavol Dobryakov turbulent simulations: paveldogreat.github.io/WebGL-...

I got into turbulent flow via chaos. The transition to turbulence sometimes involves a period doubling. Turbulence itself is chaotic motion, it is unpredictable and sensitively dependent on initial conditions. What surprised me is all the ways turbulent flow is useful to us. It is diffusive, meaning it causes mixing. This is useful in jet engines or rocket nozzles (which Destin studies) and is important to achieve in microfluidic devices, which are so small that turbulent flow is actually difficult to achieve. Turbulent flow can energize a boundary layer, which is important to maintain flow attachment over a wing, maintaining lift and delaying stall. Similarly a turbulent boundary layer over a golf ball reduces pressure drag allowing golf balls to fly further. This is the reason for the dimples on golf balls. Flow transitioning to turbulence in the wake of a bluff body can create periodic vortex shedding. This beautiful phenomenon can be seen in the von Kàrmàn vortex street in clouds viewed from space. Turbulence is everywhere, in the air currents in a room, in your aorta, in the breaths you exhale, in oil pipelines and water pipes, in the flow over cars and ships and planes. Animals have evolved for it (like dead fish swimming up stream) and we have engineered our environment, our planes and golf balls for it. Laminar flow may be nice to look at (which is why we use it in decorative fountains) but turbulent flow does the real lifting.

Animations by:
Jonny Hyman (Sun, Jupiter, Reynolds, airfoil, Earth time-lapse)

Research and writing:
AJ Fillo and Derek Muller. AJ also created the wind tunnel golf ball shots

Filmed by:
Daniel Bydlowski and Derek Muller

Additional footage:
Images of Jupiter courtesy of NASA
Turbulence in air currents by the Physics Girl, Dan Walsh, and Grant Sanderson jpvid.net/video/%E3%83%93%E3%83%87%E3%82%AA-N7d_RWyOv20.html

illBird "Shaffuru" jpvid.net/video/%E3%83%93%E3%83%87%E3%82%AA-5rkt53fNMgc.html
From EpidemicSound epidemicsound.com "Seaweed" "Colorful Animation 4"
Kevin MacLeod incompetech.com "Sneaky Adventure"









コメント数 11 930
Paul A.
Paul A. 時間 前
I feel like an argument for laminar flow is because that it is so hard to ave. It is the unique condition in a world of chaos, and so one can really value those things that are rarer and harder to achieve. However, I find laminar flow boring, so turbulent flow ftw
Pilcrow 3 時間 前
With Turbulent Juice... Turbulent Tables.
Forever555 5 時間 前
So using the golf ball example why don’t don’t we have dimples on airplane wings?
MattykVT 7 時間 前
…did he say a dead fish?
Leroy Lawrence
Leroy Lawrence 7 時間 前
👀 🤔 did he say a million dollar prize? 🏆
Daniel C
Daniel C 23 時間 前
I love the play that you and destin have. you guys are becoming cornerstones of science and yet your friendship makes it so friendly and kind.
Bernhardt 日 前
Very interesting
Gian van der Bie
Where can you buy the liquid in the aquarium?
فيزيا العربية phψzia
Saying turbulence is diffusive is fundamentally not correct It is convective. Actually the diffusion term in NS momentum equation which increases viscosity has an opposite effect on vortices making up the turbulence and it dissipates them in form of heat energy. Diffusion is what kills turbulence and convection is what creates it and keeps it going
Travis 2 日 前
i find it hard to believe that 38% of what u find in new yorks sewer system is baby wipes... that seems a little excessive
Heywood Jablowme
Lurbulent and Taminar flow are best……
Andrew Miller
Andrew Miller 4 日 前
Is there a Re number for light/electromagnetism?
Josh -
Josh - 4 日 前
The vortex shedding makes me think that maybe the difference between laminar flow and turbulent flow is another artificial line in the sand. What we call laminar flow is just the result of a situation we set up to dampen the chaos so that something stable can happen. Our temporal perspective is part of the definition. Turbulent flow at the largest scales could still look like laminar flow down here, or the other way around. The ocean has waves and eddies at it's surface, but that's somewhat independent of the currents that circle the ocean. Fractal chaos?
Ryan Roschman
Ryan Roschman 7 日 前
I didn't spend $500 to build a turbulent flow hood, I did however for a laminar flow hood bc it's more efficient for sanitary clean air
James Friedman
James Friedman 9 日 前
Unreliable results with the Wilson
Kenneth Weber
Kenneth Weber 9 日 前
Someone needs to make a super HD version of that laminar flow gif for a desktop background! That's a pretty cool visual!
Mitchell Sommer
Mitchell Sommer 9 日 前
Plebs. Transitional flow is best.
Anonymous 10 日 前
This argument is same as Uranus is more awesome than Jupiter.
budi isnadi
budi isnadi 10 日 前
0:40 thay guy was actually Derek in disguise.
Spook 11 日 前
This is actually what it means to take your sponsorship to a whole new level 💯💪🏼
Alec Xander
Alec Xander 11 日 前
14:03 VON KARMA!
Alec Xander
Alec Xander 11 日 前
This is soooo "my waifu is better than yours" but it's physics phenomenon instead.
Christian Krause
Christian Krause 12 日 前
Oh man, USA, the masters of the masters, the leaders in science ... does not throw there paper wipes into the litter boxes but into their toilet. I always shake my head if i hear those storys about the great US.
Bagel 14 日 前
Yes but turbulent flow makes me feel like I’m gonna die on an airplane
Lucas 14 日 前
Mark Robinson
Mark Robinson 14 日 前
Andrew Pa
Andrew Pa 15 日 前
Life is Turbulence
doctorseven7 15 日 前
por que no los dos?
James Lintgen
James Lintgen 15 日 前
WARNING! Carry on reading! Or you will die, even if you only looked at the word warning! Once there was a little girl called Clarissa, she was ten-years-old and she lived in a mental hospital, because she killed her mom and her dad. She got so bad she went to kill all the staff in the hospital so the More- government decided that best idea was to get rid of her so they set up a special room to kill her, as humane as possible but it went wrong the machine they were using went wrong. And she sat there in agony for hours until she died. Now every week on the day of her death she returns to the person that reads this letter, on a monday night at 12:00a.m. She creeps into your room and kills you slowly, by cutting you and watching you bleed to death. Now send this to ten other profiles on this one site, and she will haunt someone else who doesn't. This isn't fake. apparently, if u copy and paste this to ten comments in the next ten minutes u will have the best of your life. TIC TOC
William Terry
William Terry 16 日 前
I'm an aerospace engineer currently studying fluid dynamics and this video helped a lot!!!
Atta Danish
Atta Danish 16 日 前
The Vortex Street looks a lot like a Tesla Valve hmm coincidence I think not
Theo Fraenkel
Theo Fraenkel 17 日 前
still like laminar better
Free vbucks
Free vbucks 17 日 前
0:23 - ah yes peculiar flow
Illia Gelman
Illia Gelman 17 日 前
Actually, the blood flow through the heart is laminar. Turbulence can be introduced though in cases of faulty valves
Jusonomous 17 日 前
anyone else notice the music from KSP?
Swifter the kid
Swifter the kid 18 日 前
He reminds me of bery bee Benson from the bee movie
Nathan Beard
Nathan Beard 18 日 前
Best part of the whole video was the fountain at the beginning...... LAMINAR FLOW IS BETTER
Nicholas Joldersma
Mmmmmm Fractal math!
mot.inf. 18 日 前
better.. at what?
Lars Berendsen
Lars Berendsen 18 日 前
Is this also the reason why the sound of this video sounds less when the phone is on a couch (soft and less flat surface) vs when the phone is on a hard surface like a table?
a Gauthier
a Gauthier 19 日 前
How does a duck turn into a swan
jeff henderson
jeff henderson 19 日 前
Some of these graphics reminded me trying to predict the stock market. I would imagine some have attempted to use this similarity in their predictive models.
DEViL 20 日 前
katelynn graham
katelynn graham 20 日 前
I can smell the paper at 4:50 ish
katerina 21 日 前
Whenever someone will tell me "only dead fish follow the stream" ill just go "Well actually..!"
Dylicious 22 日 前
Just thinking about trying to make an equation for turbulent flow gives me a major headache lol
Whirlarc 22 日 前
So, is vortical flow turbulent or laminar?
Mintu Saren
Mintu Saren 22 日 前
No Jal chidra. Added to hole. Mythology from Netherland. Akash ganga.
Mintu Saren
Mintu Saren 22 日 前
Yadi bodo khuti thake. Turbulent
Stoner Snek Lady
Stoner Snek Lady 22 日 前
I'll save myself the time. If there isn't a universally agreed upon definition for it, then your opinion falls apart.
Jason Liang
Jason Liang 22 日 前
This gives the same energy of "my dad is better than your dad"
shahryar habibi
shahryar habibi 23 日 前
Thanks! Please make more videos about fluids, for example, non-Newtonian fluids.
Kelly William
Kelly William 24 日 前
Anyone know what went into that bluish turbulent water tank? That looked "hella cool"
LoverOfMuch 26 日 前
I saw "laminar flow" in the title and thought "oh I wonder if Destin has seen this"
Hayato Tenryuu
Hayato Tenryuu 27 日 前
Wait, I live in Huntsville, WHAT?!?!?!
Knoxy 28 日 前
Feels like im in a class of fluid dymanics again, but more enjoyable
Joseph Cunningham
I wonder how turbulent flow would effect Olympic swimmers, and if there is a way to introduce the divots in a golf ball to their suits.
DisasterMaster69 29 日 前
I love laminar flow😍
Vik 29 日 前
What if you were able to push water at the speed of light within a straight line?
Perpetuality Productions
Are you too poor to pay them to touch their single passenger plane? lol
Nathan Vomocil
Nathan Vomocil ヶ月 前
You failed. I like laminar flow more now.
Simon Kalel
Simon Kalel ヶ月 前
another cool thing about turbulent flow is well, I won't spoil it but just look at the north pole of saturn
Azhari Benyamin
Azhari Benyamin ヶ月 前
Tbh in this subject I almost failed at university, the only thing I understand at that subject was the navier-stocks, the rest of it is super difficult to me😂 (edit: and turbulent is more more more harder, and most of liquid that moving are in turbulent flow)
Flynn Flynn
Flynn Flynn ヶ月 前
I admire power, so I prefer turbulent, but others who admire perfection will prefer laminer
Gabriel Esteves
Gabriel Esteves ヶ月 前
I beg to disagree my friend...
floep ヶ月 前
Turbulence is regularity, laminar flow is singularity.
2drewbaker ヶ月 前
A swimming dead fish beats a laminar bubble.
Jason Latorre
Jason Latorre ヶ月 前
I’d like to know what the turbulent flow looks like on 700c bicycle race wheels as they spin at various rim depths. Zipp NSW wheels incorporate dimples to create “micro stalls” and waves derived from the look of a whale fin, but does it really improve efficiency?
Clementine ヶ月 前
turbulence=the force
GraveUypo ヶ月 前
exceptions are cooler than rules. so you lost right there.
Iron C
Iron C ヶ月 前
I feel like laminar flow broke up with darek and he's just trying to recover
William Smith
William Smith ヶ月 前
I experience turbulent flow about once a month :/
Darius ヶ月 前
I want to throw a Lego man down there
Laurens Salens
Laurens Salens ヶ月 前
Amazing how simply and understandable you´ve explained this, my teacher on CFD at the university could learn a lot from you!
Z-Link Corrupted
Z-Link Corrupted ヶ月 前
Turbulence is pop music. Laminar is a exquisite symphony.
Hilda Rosario Mejía Hernández
Grandioso video, muestra lo bello del flujo laminar. Como lo explica es un flujo de complicado calculo, pero con hermosas aplicaciones.🙌 Nunca entendí ni analice sus aplicaciones, hasta el día que vi este video. Gracias por el contenido 👌
Mr Jade S
Mr Jade S ヶ月 前
For your bit on the end about the flushable wipes. Our local water council urban utilities had to do a marketing campaign against flushable wipes cause they still don’t break down quick enough compared with toilet paper and were causing problems in the main sewerage system.
Nigel Morford
Nigel Morford ヶ月 前
The music in the background at 5:31 is from Kerbal Space Program..... I heard it and was like.... I know that music.... WTH is it!? Its Kerbal!
christopher ayarza
The flow of spacetime is obviously turbulent
christopher ayarza
Vortices shedding looks like a good theory of galaxy formation.
Anuja Nimesh
Anuja Nimesh ヶ月 前
“Flushable” wipes are ruining sewage plants There's a video by verge, if you wanna check it out
Aarav Bhaskar
Aarav Bhaskar ヶ月 前
Laminar Flow : Expectation Turbulent flow : Reality
W3iRdO ヶ月 前
the laminar boundary layer is parabolic......
Andrea Montes
Andrea Montes ヶ月 前
Antes de ver el video aún tenía ciertas dificultades para poder distinguirlos, y sobretodo visualizar claramente como era cada uno. Considero que el haber colocado imágenes sobre como es realmente, ayuda muchísimo a entenderlo mejor
Axel Dayton
Axel Dayton ヶ月 前
Plot twist: Laminar Flow was jealous of Turbulent flow for being so unpredictable
aske frederiksen
aske frederiksen ヶ月 前
So that’s why Superman have a cape
chair table
chair table ヶ月 前
7:05 Come
Cr4z7y ヶ月 前
You just describe what turbulent flow does, not why it is better...
Ein Teil von Allem Alles ist ein Teil von mir
"Wissenschaft sollte sich nicht selbst begrenzen an Wertungen wie besser oder schlechter. Sie sollte immer mit dem Arbeiten was ist. Viktor Schauberger. Turbolenzpionier.
Dmon !
Dmon ! ヶ月 前
I don't really care much for the sponsoring company but it seems ridiculous that non flushable wipes exist. There should be campaigns and legislation to replace non flushable wipes with flushable ones... Sure they're just stupid wipes but the damage they pose from accidental flushing is big as even you have shown. And just because other non flushable wipes are not flushed doesn't necessarily mean they can be ignored as if they may not pose a problem elsewhere.... No one needs wipes that last a long time given they're one time use products...
The Shogun
The Shogun ヶ月 前
First check, Turbulent flow crunches the JPvid compression system
Lorraine Williams
14:40 I gave this a day to process and I have to say this is a very calloused dismissal of a living being. I will neither support this channel or any sponsor of it.
Jerry G.
Jerry G. ヶ月 前
Turbulent flow is liquid entropy, the source of death. How could anyone love something like that? (I am kidding)
Solo Action
Solo Action ヶ月 前
5:19 nice animated wallpaper G
tarundeep singh
tarundeep singh ヶ月 前
I love your videos and concepts, I love turbulence as the way they are and love those materials you use to show turbulence, like some kids balls these days in Kmart or toy shops but I love laminar flow too. It’s awesome as waterfalls that are chaotic transitioning to turbulence look awesome but small ones too. Their respective sound that they produce has same effect I.e disturbing or chaotic vs calm or pleasant. But I like both. Enjoy world
No One
No One ヶ月 前
Laminar flow is better if you USE IT TO KEEP YOUR WORK AREA STERILE 😉 🍄
Mark Dominic
Mark Dominic ヶ月 前
None of the comments nor the video mention an interesting real world application of the dead fish swimming effect is that cyclists us this when racing by tailgating the lead racer giving a small chance to rest up a bit before resuming the lead again
Kenneth Welch
Kenneth Welch ヶ月 前
My life has changed in a positive way since starting to use flushable wipes. no longer do i need to wipe. and wipe. and wipe. and wipe. and wipe. and wipe. and wipe over and over again just to feel remotely clean. with flushable wipes it is one and done and i feel good knowing im not flushing half a roll of tp.
Matthew Lambermon-Southam
Every documentary on tv with wind turbines, supersonic jets in scale models in a wind tunnel, every simplified explaination of aerodynamics, the flow of your hose to a river, to an ocean, it never failed to frustrate me beyond belief it'd keep me awake at night going over and over it, that I damb well knew it physically behaves differently in scale but no one seems to bat an eyelash about actually explaining why! Re is one of those things you instinctively know but never have heard the name of it.
Dylan Lafreniere
Dylan Lafreniere ヶ月 前
It’s strange how it’s much easier to understand this in 2D instead of being 3D.
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