Turbulent Flow is MORE Awesome Than Laminar Flow

  • Am Vor 2 years

    VeritasiumVeritasium

    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 de-film.com/us/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 de-film.com/v-video-N7d_RWyOv20.html
    de-film.com/v-video-_UoTTq651dE.html

    Music:
    illBird "Shaffuru" de-film.com/v-video-5rkt53fNMgc.html
    From EpidemicSound epidemicsound.com "Seaweed" "Colorful Animation 4"
    Kevin MacLeod incompetech.com "Sneaky Adventure"

SmarterEveryDay
SmarterEveryDay

LAMINAR FLOW IS BETTER. Obviously the Laminar Boundary Layer section was the best part of the video. (I jest.) In all seriousness though I thought you did an amazing job with this content Derek. Discussing the transition to turbulence is very difficult and you did a masterful job of it here. Animating Reynold’s experiment on the page was masterful. Your point that laminar flow must be small was very interesting, and when I saw the images from space I had a fun time thinking about what parts were laminar and what parts were turbulent. I’ll put a link to this video on the laminar flow video. All these nice things being said....I have something up my sleeve!

Vor 2 years
Orinj Nanu
Orinj Nanu

Turbulent flow is also able to cool CPU waterblocks more effectively by breaking up the boundary layer against the metal.

Vor 3 Tage
Mecha Mahou
Mecha Mahou

Broscience ftw

Vor 2 Monate
Toketildeath
Toketildeath

I clicked just to see if Dustin commented. Make sure he gets his % bud

Vor 2 Monate
itsyaboi
itsyaboi

Lmao, before even seeing the video I knew this would be the top comment.

Vor 2 Monate
Lars
Lars

As a professional pilot, I can say this is by far the best explanation of these effects I have ever seen. I wish I had this when I was first learning about this. Would have made the concepts so much easier to understand! All new pilots should watch this video, especially the parts on Rynolds number!

Vor 10 Monate
Derrick Becker
Derrick Becker

Better than explaining laminar and turbulent flow differences using Reynolds number?

Vor Monat
Lars
Lars

@jdemonster K. More that this does a much better job explaining a complex subject that often takes a good long while for student pilots to understand

Vor 2 Monate
jdemonster K.
jdemonster K.

Damn ur telling me people haven't been successfully flying airplanes their whole lives before this video?

Vor 2 Monate
David Schütz
David Schütz

That’s what I thought. ATPL Student learning for my 13 exams. It’s interesting

Vor 2 Monate
Shadoe Lass
Shadoe Lass

CPL here, agreed

Vor 6 Monate
Ian J Barker
Ian J Barker

I remember struggling with fluid dynamics more than any other class in college because, until then, science had seemed to make intuitive sense. It was the first time I had to listen to what science was telling me and just say, "okay, if you say so."

Vor 11 Monate
Bullshit Department
Bullshit Department

@master shooter64 it is, and isn't, at the same time.

Vor 2 Monate
FissionPhoenix
FissionPhoenix

We called that "pushing the I believe button" in navy nuclear power school.

Vor 2 Monate
master shooter64
master shooter64

@Metrion77 quantum mechanics is a field of science

Vor 2 Monate
Metrion77
Metrion77

@master shooter64 quantum mechanics is where science goes to die

Vor 2 Monate
master shooter64
master shooter64

@TheRealYaworm He should study quantum mechanics lol that's where intuition goes to die, then get's revived then dies then gets revived then dies....repeat for infinite amount of time.

Vor 3 Monate
Cheese Sandwich
Cheese Sandwich

Took a class just called “Turbulence” during my aerospace M.S. and I understood just as much about turbulent flow at the end of the course as at the beginning.

Vor 7 Monate
The Thinking Mans Game
The Thinking Mans Game

Sooo you wasted time and money... when a 20 min video would have been 50 time better... hmmm seems like college is a joke

Vor 6 Tage
TheRealYaworm
TheRealYaworm

I would have agreed, if he'd covered the inertial subrange. :(

Vor 3 Monate
ah byt
ah byt

me too

Vor 4 Monate
Storming Heaven
Storming Heaven

This also applies to the machine shop! As the metal “hits” metal and cuts. There is a flow zone at the point of contact where molten metal slides across the cutting tool. Sandvik has done a good bit of research.

Vor 11 Monate
starship42
starship42

As an aerospace engineer I'm so glad this video was made. I love Destin's video on laminar flow but I kept thinking "but but but the flow is so much easier to separate if the flow is laminar" But also, you can't just mention that a dead fish can swim upstream in a sentence and move on! That deserves it's own video! How does something move upstream without it expending energy! How does an object move forwards when you blow on it! The only explanation I have is there is lower pressure closer to where the vortex is shed than far downstream, so the fish is being "blown" upstream by the pressure difference...

Vor 2 years
Bullshit Department
Bullshit Department

"How does an object move forwards when you blow on it" there was a huge series on this made by Veritasium, they had a sail-car that went against the windstream.

Vor 2 Monate
starship42
starship42

@Alejandro Ochoa Good advice, but just want to clarify. Aeronautical pertains to airplanes, not ships. Aerospace is the wider field that includes airplanes and spacecraft. The truth is design wise airplanes and spacecraft are quite different, although they share a similar history. The full name of my degree is actually Aerospace Engineering (concentration: Aeronautics) because I specialized in airplanes. But yeah, getting an AE degree is like overkill to become a pilot, unless you want to be a test pilot. Instead, they teach pilots really oversimplified explanations of how planes fly (or just straight up erroneous ones, like the equal-transit time theory of how airfoils work), but it doesn't matter. They just need to know how to fly the plane safely. That's why we call them "meat servos" lol.

Vor 2 years
Corrick
Corrick

@Leonardo Dipilato put the link up

Vor 2 years
Corrick
Corrick

@Tategami Raphael Ch. 立髪ラファエル I was wondering that! it would make sense that this would be the case if fish have evolved so many years to have scales. Someone needs to put a fish in a wind tunnel . . . or maybe a water tunnel

Vor 2 years
Corrick
Corrick

@DaniXks oh yeah! fish do have multiple fins that act as keels though right? edit: sailboats don't actually move straight into the wind though. The technique is called tacking - the sailboat moves diagonal to the wind and switches back and forth and somehow (honestly not sure how tacking works) moves forward

Vor 2 years
Douglas Von
Douglas Von

This is such a friendly and fun conversation between two people who are intellectually curious! Thank you for everything both of you guys! A great example

Vor 10 Monate
Jim Mooney
Jim Mooney

When I stir coffee with viscous honey, which mixes slowly, previously leaving residue in the cup, I decided to stir in one direction, than abruptly change direction twice to increase turbulent mixing. Physics makes for better coffee 😜

Vor year
Laurens Salens
Laurens Salens

Amazing how simply and understandable you´ve explained this, my teacher on CFD at the university could learn a lot from you!

Vor 10 Monate
Smit Kapadia
Smit Kapadia

I have been confused about laminar, turbulent flows and boundary layers. Thank you very much for making a video with these amazing animations and explaining these crucial concepts in an easy-to-understand manner!!

Vor 7 Monate
You Liked That
You Liked That

When the two smartest kids in class have different answers:

Vor 2 years
Modredastal
Modredastal

Remember that shiny picture book from the 90s, The Two Wizards?

Vor 11 Tage
stare
stare

Frrr

Vor 29 Tage
Hoverboard2525
Hoverboard2525

@shin tenkai now visualize it as a 3rd grader with micheal's voice

Vor Monat
tyedye
tyedye

@Mr. Cash yes i was going to say he was the teacher

Vor Monat
Drakoo the Rat
Drakoo the Rat

And theyre somehow both right cause relativity or somthing

Vor 2 Monate
Factory Thirty-3
Factory Thirty-3

I had previously seen Destin's video on Laminar flow, which was awesome.... But, I would have to give it up for turbulent flow ONLY due to the fact that turbulent flow is my friend in the world of time attack racing and downforce vs. drag coefficients. When you talked about the vortex generators on plane wings, this made me realize why rear wings on certain vehicles can produce so much downforce with minimal drag. So thank you and thank you turbulent flow!

Vor year
Guillaume C
Guillaume C

All these efforts just to bring me to the conclusion that turbulent flows are even less cool and awesome than laminar flows than what I previously thought... They're everywhere, the most common in the universe, nothing special about it

Vor 11 Monate
j0qr
j0qr

15:16 "In contrast, Laminar Flow is small, superficial (cue clip of Destin happily playing with Laminar Flow), it's... a toy" priceless

Vor year
nuclearspike
nuclearspike

Could the laminar boundary layer/skin friction be solved or minimized by having golf ball like dents that create eddies along the edge that reduce friction? Or would those eddies potentially cause more turbulence throughout the whole flow?

Vor 8 Monate
OHYS
OHYS

2020 has already been a turbulent year, but I wasn't expecting WW3 to erupt between Smarter Every Day and Veritasium

Vor 2 years
Jj Sweg
Jj Sweg

@OHYS lmfao it wasnt stupid it just aged oh so terribly

Vor 4 Monate
OHYS
OHYS

Wow what a stupid comment this was. It was posted a year ago. Idk what I was thinking

Vor 5 Monate
dorkle
dorkle

:(

Vor 5 Monate
Live The Future
Live The Future

Well Derek is from Australia, so I guess US vs Emus! Guess who'd win?

Vor 2 years
Alan
Alan

TeamVeritasium / TeamCanada all the way 🤘🏼😛

Vor 2 years
Steve Millar
Steve Millar

This just made me appreciate Laminar flow even more! I'm looking forward to what you've got up your sleeve, Destin 😄

Vor 8 Monate
Tarundeep singh sodhi
Tarundeep singh sodhi

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

Vor 10 Monate
Andrea Montes
Andrea Montes

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

Vor 10 Monate
Daniel C
Daniel C

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.

Vor 8 Monate
Jerrico Villanueva
Jerrico Villanueva

"laminar flow is slow, superficial. It's a toy. That's why its most notable use is on decorative fountains" Most scientific diss track on YouTube

Vor 2 years
PUNKISINTHEDETAILS
PUNKISINTHEDETAILS

@Xander Blake he isn't saying turbulent flow is preferable it's often just a waste of energy or flow detachment but he is saying it is more interesting. Laminar flow is visually appealing because it almost looks like it isn't even moving like a sheet of glass.

Vor year
Alex Borr
Alex Borr

Me and all the others Destin fans are very upset from that statement please take it back! :P

Vor year
Rayyan Uddin
Rayyan Uddin

Oh god 🤣🤣

Vor year
PUNKISINTHEDETAILS
PUNKISINTHEDETAILS

@Snipe Hunter hey drilling can learn a lot from worms. They dont need angle motors for one thing haha. jk man. great talking.

Vor year
Rolando Tillit
Rolando Tillit

Vortices accelerate flow, they act as a conduit for air flow. Low pressure air has less resistance, a vortex is literally the path of least resistance. Viva less resistance.

Vor year
Michael McClain
Michael McClain

I know you'll likely never see this, but I absolutely love how excited you get on these subjects. Your videos often start with a simple question, calmly asked. But, you always seem to get really excited and it excites and intrigues me. I love your content.

Vor 4 Monate
Vahid E. Hosseini
Vahid E. Hosseini

Thank you Veritasium! You made a huge inspiration for me in my musical Composition methodology... I'm writing a piece based on this (not inspired by it but literally based on fluid mechanics and states of matter). I'll keep you posted about it ;) Keep up the good job!

Vor 7 Monate
Isaac Teal
Isaac Teal

This is the one of the best science/info vids I have seen on YouTube. I’m a weather forecaster and this does such a great job helping visualize what is going on in 3d space

Vor 3 Monate
Chris Sabal
Chris Sabal

We have the difference between a physicist mindset and an engineer lol the engineer loves simplicity, elegance. The physicist loves the complex, difficult system. Neither is wrong, just different.

Vor year
Pinaki Swain
Pinaki Swain

I think Engineers are more concerned with reasonably ok solutions to complicated problems. The solution need not be elegant if it works. Theoretical physicists or mathematicians look for elegance and simplicity.

Vor 3 Monate
Andrea B
Andrea B

Smart thought.

Vor 4 Monate
Toxic_ Constituents
Toxic_ Constituents

@N I bet jee aspirant hoga tu

Vor 6 Monate
Toxic_ Constituents
Toxic_ Constituents

@N abey saale, physicists create the foundation on which engineers work on, anyone really, physicists are the writers whereas other people who use stem applications are the readers

Vor 6 Monate
Toxic_ Constituents
Toxic_ Constituents

Engineers be like: Pi?? You mean 3??

Vor 6 Monate
Honey Badger
Honey Badger

14:00 Periodic Vortex shedding reminds me of the bifurcations that occur during the increased rate of change of the logistic map. The increased rate of change of the logistic map also eventually leads to a "chaotic" behaviour much like the increased rate of flow turns visibly ordered laminar flow into chaotic turbulent flow. 05:20

Vor 22 Tage
Dylan Lafreniere
Dylan Lafreniere

It’s strange how it’s much easier to understand this in 2D instead of being 3D.

Vor 10 Monate
bruchpilot747
bruchpilot747

Out of all science videos you (and destin) have made (and I include your bet regarding the wind powered vehicle) this has always been the absolutely most nerdy and geeky video ever made by anyone... my two cents on this: turbulent flow is visually mesmerizing. laminar flow is a nicer hands on experience and just satisfying in its order / the perfection of everything being in line.

Vor 2 Monate
Zachary Davis
Zachary Davis

💙Great content 😂 Turbulent and Laminar are both great(IMO), but love the enthusiasm behind the sales pitch for Turbulent lol hope there is a lot more content to come !

Vor 11 Monate
Raid
Raid

I'm a mechanical engineer and I once did a project in my senior fluids lab studying drag coefficients of rough spheres versus smooth spheres and other objects with round cross sections. We demonstrated that 1. The rough sphere had a smaller drag coefficient in the wind tunnel due to induced turbulence at the surface, and 2. You must always remember to prop open the door so that it doesn't slam closed when you power up the tunnel and disturb the computer science students in the lab next door.

Vor year
anthony morales
anthony morales

@Chris Stratford that's hysterical and fascinating

Vor year
Attaxalotl
Attaxalotl

@Endure The Struggle Mythbusters actually did that, and they found that it doesn't work. :(

Vor year
Attaxalotl
Attaxalotl

Useful results! I'll keep this in mind for when I go off to collage.

Vor year
Ich brauch mehr Kaffee
Ich brauch mehr Kaffee

guess why golf balls have dimples

Vor year
Endure The Struggle
Endure The Struggle

@Chris Stratford OH MAN! haha talk about closed system and not thinking ahead haha

Vor year
Hilda Rosario Mejía Hernández
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 👌

Vor 10 Monate
Tim Sexton
Tim Sexton

This was an interesting topic. Great job! Oh and while *_laminar flow is beautiful, turbulent flow is essential._*

Vor 3 Monate
AimHere
AimHere

I studied Chemical Engineering in college and had to take several classes regarding fluid mechanics and dynamics. While there is a lot of complex mathematics and application of the equations shown is a whole different beast, this video did an amazing job discussing the theory of turbulent flow. The real world examples of turbulent flow were incredibly well done and would have been very useful as a teaching tool in classes.

Vor 8 Monate
Plasmeres
Plasmeres

I've loved turbulent flow ever since I read an article in college about how our understanding of turbulence limits weather knowledge

Vor year
Darkrath Wheito
Darkrath Wheito

Incredible the use of science with the sponsor, explaining scientifically how they're different, and what benefits they can have, just awesome, i'mma buy some just for the sake of experimentation.

Vor 2 Monate
SlowMonoxide
SlowMonoxide

I'm on Team Laminar Flow. Turbulent flow, while useful/essential for many things, shares the same downfall of all chaotic systems, in that its end result is transforming useable energy into dissipating heat. Supporting Team Turbulent Flow is supporting Team Entropy, and Team Heat-death, and is thus heresy of the highest order :-p

Vor year
Jacob Walker
Jacob Walker

Or worship of the highest disorder, if you will. ; )

Vor 11 Monate
Solipsistic daydreams
Solipsistic daydreams

I’ve always loved turbulent flow (check picture for reference) this video has shown me there’s a name for it and that if I learn math I could be rich. It’s also given me an appreciation for laminar flow

Vor 7 Monate
Spook
Spook

This is actually what it means to take your sponsorship to a whole new level 💯💪🏼

Vor 9 Monate
Jeremy Burch
Jeremy Burch

Do not flush so called "flushable" wipes. Just throw them in the trash. Tearing is not the same thing as disintegrating. I work on sewer systems. Those things get hair and grease and other material attached to them and they bind up pumps and other equipment and ultimately have to be removed, costing your sewer utility tens of thousands of dollars a year for the smallest of systems.

Vor year
Lernyd
Lernyd

I read this before seeing that section of the video and was thoroughly confused

Vor year
777Skeptic
777Skeptic

I trust Veritasium for the most part, but since he's sponsored by Cottonelle, I want an independent study on those flushable wipes.

Vor year
Herr Fuchsschwanzsäge
Herr Fuchsschwanzsäge

@Dion St. Michael Awareness would help, but in many cases I'm afraid it comes down more to good old fashioned human laziness and carelessness. On the list of things flushed down the toilet/sink I've personally seen are (excluding stuff like an inquisitive three year old who wanted to know how many rolls of toilet paper fit into a toilet or an alzheimers patient flushing several days worth of newspapers): Cat litter; paint thinner; paint; drill heads; underwear; concrete, cement and latex mortar; tile glue; all kinds of random construction debris; random household garbage (as in someone emptied their bin into the toilet); a shower curtain; motor oil; dead pets up to the size of a small bunny; aluminium soda cans, and since the last year increasingly often in public restrooms, medical masks.

Vor year
whatfireflies
whatfireflies

Here's a wild idea. What if we had a small bathroom fixture you can sit on and wash your buttocks with actual soap and water. Wouldn't that be more hygienic, way cheaper, and you wouldn't have to flush rubbish down the toilet? OH WAIT, the non-English speaking world has it and we use it everyday, it's called a bidet.

Vor year
roux man
roux man

whos here before this turns into a toxic arguing cesspool in 10 years

Vor year
Sistla.Abhiram kasyap
Sistla.Abhiram kasyap

This was literally my final year project. Back then we checked the effect of creating turbulence around oil rigs.

Vor 11 Monate
LuckyLAK17
LuckyLAK17

Hey, another great fun and interesting video! Just, laminar flows are not only a game. In aviation they're kind of a holy grail. As the airfoils in an aircraft wing are able to drastically reduce the shape drag, ideally you want to have laminar flow to reduce the skin friction drag (in contrast to a golf ball where you need to reduce the shape drag). But as it was rightly said in the video, at the flight Reyonolds number of a large commercial airplane there's no chance to keep the boundary layer laminar along the wing chord. Much research has been done in this direction. Some airplanes though can do that, in fact they are specifically designed and built to achieve laminar flow over 60%+ of the upper and lower wing surfaces.... Fancy to know what kind of aircraft can do that? Those are the modern high performance gliders (see my channel), whose airfoils are spefically designed to delay the transition of the boundary layer as much aft as possible. Thanks to the laminar flow (and to therir high aspect ratio wings) modern gliders can fly with Lift to Drag ratios of over 50, which means for every mile of altitude loss the glider will fly a distance of 50+ miles. Laminar flows are amazing if you're a glider pilot :)

Vor 3 Monate
shahryar habibi
shahryar habibi

Thanks! Please make more videos about fluids, for example, non-Newtonian fluids.

Vor 9 Monate
Loanword Eggcorn
Loanword Eggcorn

Thanks for very clear introductions to turbulent and laminar flow.

Vor year
Attila
Attila

Life is turbulent, and the things I love are laminar

Vor year
because he livees
because he livees

omg this comment deserves a pin.,

Vor 6 Monate
because he livees
because he livees

omg this comment deserves a pin.,

Vor 6 Monate
stare
stare

Lol

Vor 10 Monate
Draconus Dragonborne
Draconus Dragonborne

...small slow and viscous

Vor 11 Monate
Poindexter Queue
Poindexter Queue

Laminar flow excites an aesthetic part of my nervous system; turbulent flow excites my imagination. Either way, _flow_ has a very pointed effect on my state of mind. Interesting.

Vor year
Jacob O'Neill
Jacob O'Neill

I think computer simulations with machine learning can be made that closely match existing patterns and can provide increasingly accurate predictions. The models could tell us the methods and help us with those lemmas. Maybe someone is already working on this. Edit: I love the Magic Fluids clips!

Vor year
Lynda Wall
Lynda Wall

I have always loved turbulent flow much more than laminar, I just never knew they were different things 😅

Vor 10 Monate
_Lycostehwulf_
_Lycostehwulf_

I'm a laminar flow guy for a long time, this video changed my mind. Turbulent flow for life.

Vor year
Electric Cruiser
Electric Cruiser

Me, an engineer who just likes easier math associated with Laminar Flow: my opinion on Laminar being better than Turbulent will remain unchanged.

Vor 2 years
Wasim Farooq
Wasim Farooq

same here

Vor year
NAPhi
NAPhi

Someone: Turbulent flow is Better. SmarterEveryday: Whomst has awakened the ancient one

Vor year
Electric Cruiser
Electric Cruiser

@lil Chungus Huzzah! a man of culture

Vor year
Electric Cruiser
Electric Cruiser

@lil Chungus Likewise

Vor year
Electric Cruiser
Electric Cruiser

@lil Chungus Lesser being? You are not welcome into the Elite Society of Engineers.

Vor year
crimony
crimony

If you compare 10:30 to 11:25, you'll see there isn't much difference. But if you imagine that turbulence fishtails across a wing surface like it does at 14:35, then you can see how tiny vertical stabilizers might reduce turbulence across the horizontal surface of the wing, the surface that is not shown in the two-dimensional wind tunnel animations.

Vor 2 Monate
David Williams
David Williams

Derek, as a follow up, can you do another video on turbulent versus laminar flow? Specifically auto racing! I would encourage you to head to an endurance race specifically because racing teams and engineers sweat this stuff to the tiniest details and the cars are on track for up to 24 hours at a time so the effects are wide ranging. 12 Hours of Sebring? 24 Hours of Daytona? Or better yet, the 24 Hours of Le Mans. Some aero devices have smooth edges, some have saw tooth edges. Why? Where do teams engineer laminar flow and where do they engineer turbulence? How do they use tools on the front end of the car to have a positive effect (or mitigate a bad effect) 6 feet away on a different part of the car? Lastly, take a look at the filth on the cars at the end of the race. We can actually observe the artifacts of the air in areas of the car that are "clean" and others that are dirty.

Vor year
JCB
JCB

Thanks! You've pointed out a good number of reasons that turbulent flow is... turbulent... and laminar flow is... cool.

Vor 24 Tage
Leo Powell
Leo Powell

What would happen if you had a laminar flow going through that tank of turbulent flow? When they combined would it stay laminar or would it create more turbulence? Curious to know. 🤓

Vor year
Théo Saur
Théo Saur

Friendship ended with Laminar flow, now turbulent flow is my best Friend

Vor 2 years
A persun that has a ridiculously long profile name
A persun that has a ridiculously long profile name

??? أكلات سهله وبسيطهom malaka

Vor year
debandjim333
debandjim333

You can love both!

Vor year
Rick Polar
Rick Polar

That's the nickname I use for ex's periods

Vor year
Maxwell's equation
Maxwell's equation

Do you even understand vector calculus?

Vor year
takumi168
takumi168

Destin is not impress.

Vor year
Aditya Chothani
Aditya Chothani

thanks for making fluid mechanics concepts so interesting.

Vor 3 Monate
Petrus Pretorius
Petrus Pretorius

And we all want to thank you for putting together this content 👏👏

Vor 11 Monate
1965Numbersman
1965Numbersman

I finally just clicked on this video and glad I did. Can you explain the phenomenon surrounding the dimpled surface of the golf ball which allows it to travel further? It is because the skin friction doesn't get to develop?

Vor 5 Monate
Anthony Giangaspro
Anthony Giangaspro

I thought the red line you labeled around 9 min is a velocity gradient. The boundary layer is the imaginary line separating inviscid and viscous flow.

Vor year
Benjamin Wang
Benjamin Wang

Derek: Turbulence is amazing Destin: So you have chosen death

Vor 2 years
Plus Ultra
Plus Ultra

@Ashdrey1337 Nani?

Vor 2 years
Ashdrey1337
Ashdrey1337

OMAE WA MOU SHINDEIRU

Vor 2 years
Plus Ultra
Plus Ultra

The battle of the two Ds

Vor 2 years
Ilia Broudno
Ilia Broudno

Love the video, found some parts a bit challenging and hope there is a follow-up video. For example the need for turbulence at the back of the wing is still a bit unclear. Is pressure drag (new concept i encountered in this video) the key here? Do you need to have the flow above the wing to stay connected to the wing because otherwise there will be pressure drag front vs back? Also the dead fish at the end swimming upstream is very interesting and I'd like to see more on that. Are the opposite vortices propelling it towards the obstacle? What happens at the obstacle? How much energy do you need to get ahead of the obstacle compared to energy you saved by approaching it from behind? Is it better to stay clear of the obstacles or to get behind them while trying to get upstream? Also what about the wake behind a boat? Is it possible to keep up with the boat while surfing its wake?

Vor year
Paul Klement
Paul Klement

essentially, lift is produced when the air over the wing adheres to the wing and flows faster than the air below it (this is a model explanation and not complete). When the plane flies with its nose pointing upwards, its more difficult for the air to adhere to the upper side of the wing and if it fails to do so, not enough lift is created. And since turbulent flow is better at sticking to the wing then laminar flow, inducing turbulence allows the plane to point its nose higher while still creating enough lift. Thats useful in a lot of situations, especially when landing. As far as i know, pressure drag isnt an issue there.

Vor 8 Monate
Ravi Shankar Ojha
Ravi Shankar Ojha

I love your work. You are the best scientist whom I know, the Veritasium. I really admire all your work. Good luck for future projects from 🇮🇳 👍

Vor year
Tony Bordonaro
Tony Bordonaro

I'm sorry, Derrick, but I have to go with Destin on this one, the fact that laminar is more rare is what makes it more beautiful.

Vor 2 Monate
Glenn Nickey
Glenn Nickey

I was a little disappointed turbulent flow and heat transfer weren't discussed. Turbulent flow is critical to good heat transfer. Heat exchangers have a minimum flow set by the transition to laminar flow.

Vor 8 Monate
Richard Chris
Richard Chris

As an aerospace engineering student, this was a love letter

Vor 2 years
ianmurphy76
ianmurphy76

It's like a nerdfest here. I feel so at home 🏡

Vor year
Cptmhr
Cptmhr

As a chemical engineering student, this made me wet because i saw turbulent flow occur in something other than a rusty pipe

Vor year
Lisa Hogholt
Lisa Hogholt

I also study aerospace engineering and I have a class on fluid dynamics next semester... not looking forward to solving Navier-Stokes equations lol

Vor year
AlecnPerlite
AlecnPerlite

I'm an ME major but took some aero classes, and this was so fun to watch with the knowledge from those classes haha

Vor year
T S
T S

@TJ ah, i get you,

Vor year
Mr. Costa
Mr. Costa

This channel alone, taught me more than most of my years of school.

Vor 11 Monate
MrHeleenify
MrHeleenify

I’m so amazed about how much subconscious information your brain stores and can relate to conclusions: Do you see turbulent turbulent vortexes in the clouds? You get the immediate feeling land must be close by. See the strings on the air plane move stochastically? You know you must be slowing down.

Vor 11 Monate
Sythrus Keeper Of Balance
Sythrus Keeper Of Balance

Ive always been a fan of cause and effect, which turbulent flow embodies. More specifically the cascade effects that occur, as it is present throughout all of reality. If at the beginning of the universe, one SINGULAR particle was even a nanometer to the left, the entire course of the universe would likely be irrevocably different to what it is/will be as it is now. Order within chaos, chaos within order. Everything that ever was, is and will be was all determined at the dawn of time. We exist within a closed system, where the only way to alter its course is as an outsider. Every action we take, every thought we have, all of it affects the entire course of reality. Even still, we only think the way we do because it was predetermined... still no excuse for being a horrible person though.

Vor 4 Monate
44 Hawk
44 Hawk

It is sometimes epitomized by random Eddy currents. The Eddy currents themselves are laminar but the way they manifest themselves within a turbulent flow system is to random for them to be of any good effect.

Vor Monat
crystalpie
crystalpie

Laminar flow is a fun thing, turbulent flow is more of a “nature is beauty” type thing.

Vor year
TheCircus Freak
TheCircus Freak

Winner, here.

Vor 2 Monate
levet byck
levet byck

when physics become poetic: :)

Vor 4 Monate
Angelica
Angelica

beautifully said

Vor 7 Monate
junjunjun l
junjunjun l

Learned more in this video than what I did in my fluid dynamics class

Vor year
Richard Cottone
Richard Cottone

The top surface of a B52 wing has small vertical curved air foils ( about 2 in. x 2 in. called vortex generators. Without these vortex generators the wing would begin to buffet wildly

Vor 3 Monate
Michael Pflaumer
Michael Pflaumer

Flying paramotors gives you a great awareness and apprecation for the differences between the two different types of flow.....your life kinda depends on it..... That being said, I love the utility and predicatability of laminar flow and also greatly respect the abstract essence and power of the turbulent flow.... Come fly with me!

Vor 26 Tage
Philly G
Philly G

Awesome episode! Food for thought of the laminar boundary layers of plasma in stars inner layers turning to turbulent at outer layers , laminar flow + entropy = turbulent flow,, black holes (event horizons)can be said to be laminar, definitely not small. Laminar Magnetohydrodynamics.?

Vor 10 Monate
Flyprdu
Flyprdu

I had a meteorology professor that had a saying when talking about the atmosphere: "Big swirls, have smaller swirls, which feed on their velocity. Smaller swirls have lesser swirls, and so on to viscosity."

Vor 2 years
Tom F
Tom F

Kolmogorov.

Vor 2 years
Jia Yang
Jia Yang

This is quote from Lewis Fry Richardson

Vor 2 years
I.M. Shirley Rongh
I.M. Shirley Rongh

ooh *very* clever, some of the best sayings come from school teachers

Vor 2 years
BUXBE
BUXBE

I wonder if the turbulence points on the wing would work with sails? I wouldn't say TF is unpredictable; rather, it is more efficient. That's why it's amazing. We can design predictability in it.

Vor 2 Monate
Shon G
Shon G

Hey there, I am a greatly impressed by your work and a regular follower of such contents in YT. However, I felt I should tell you that the method used to test the strength of so called "flushable wipes" isn't depicting real life situations and the misguidedance lead by this in consumers shift towards genrric "flushable" sheet will be not so good for the sewerage system. Kidney ensure to select appropriate sponsor and convey facts which are more to real world (like clumping of these wipe will result in clog, it won't disintegrate in drainage). Thank you for your time, keep producing more videos too .

Vor year
Douglas Clerk
Douglas Clerk

You might have omitted an item for your turbulence checklist: turbulent flow is - or at least can be - noisy. Listen to the flow of water in a hosepipe when laminar as compared to turbulent.

Vor 28 Tage
Jason Latorre
Jason Latorre

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?

Vor 9 Monate
AlphaxAlex
AlphaxAlex

Can we just say that the liquid he’s playing with looks amazing

Vor 2 years
how to drive a Tardis?
how to drive a Tardis?

@Doofis Mannfred thank you I didn't know that

Vor 2 years
Emphasis
Emphasis

Metallic acrylic paint. I use it to make liquid art on canvas

Vor 2 years
Doofis Mannfred
Doofis Mannfred

@how to drive a Tardis? Opaque liquid hand soap can do this when mixed with water 1:1. (Softsoap is the brand in particular I have that does this.)

Vor 2 years
Arcadio Mushi
Arcadio Mushi

It looks like the top view of a shiny ocean

Vor 2 years
Christian Jaswan
Christian Jaswan

Shampoo does that

Vor 2 years
Davide Silva
Davide Silva

Hey Derek, I disagree with when you said the most notable uses for laminar flow are ornamental fountains. Laminar flow is dope and crucial for microbiology. It keeps turbulent air, filled with unwanted bacteria and fungi, from contaminating our cultures

Vor year
Louis Gillick
Louis Gillick

I'm an engineer and turbulence is just as important and "interesting" as laminar flow. For most things, laminar flow is very rare or short lived. I find it incredible that while we as a race spend billions to delve deep into the heart of sub-atomic particles and also the vastness of space, we pay relatively little attention to this thing we see every day! We are stuck using empirical, not analytical, models to estimate its properties! Btw when Derek said the Navier-Stokes equations are true for any fluid flow, he means any incompressible fluid (e.g. low speed air or water). He is totally correct about how hard thet are to solve analytically and neatly. A more general equation for fluid flow would be the Cauchy equations, which is true regardless of whether the flow is compressible or not. (In fact, the N-S equations drop very neatly out of the Cauchy equations if you assume the divergence of the velocity vector is zero.)

Vor 6 Monate
Deepanshu Gupta
Deepanshu Gupta

The passive aggressiveness in calling Destin a child playing with laminar flow was out of this world 🤣🤣

Vor 11 Monate
Carrick Richards
Carrick Richards

Relevant, clever and interesting. Laminar flow helps in surgery, using clean filtered air to push outward from the 'open' patient, who needs to be kept sterile. Thank you

Vor Monat
Jokeal
Jokeal

Never heard this term before, but this morning I was thinking about how the cream in my coffee swirls beautifully and switched directions so many times- now I know what it is called. Thank you for helping me become smarter everyday.

Vor 2 years
Manuel Gonzalez Parra
Manuel Gonzalez Parra

Luominen R Intelligence includes the ability to acquire knowledge, which this person is practicing by acquiring knowledge about fluids. The act of learning improves your ability to learn and thus makes you smarter. So let this person enjoy learning.

Vor 2 years
Hello Dumplings
Hello Dumplings

Job Fernandez yeah, there’s a difference between intelligence and knowledge. You can tell when a baby or small kid is smarter than other even though they pretty much know nothing.

Vor 2 years
Job Fernandez
Job Fernandez

@Hello Dumplings youre saying that I'll still be smart even though I dont know things? :>

Vor 2 years
JM
JM

@Hello Dumplings I get your joke man, ignore these other ppl. Have some humour in life folks.

Vor 2 years
Nebby14 ★
Nebby14 ★

Luominen R Please explain olé wise one how one gets smart by not knowing things.

Vor 2 years
Richard Cottone
Richard Cottone

It can also work on a philosophical level. When in your youth ,Things go along in a smooth way, you usually remember this in a nice period of time where nothing happened, but if something happens out of the ordinary, you remember this specific memory, even though it is small. This memory could become a vortex that will grow and influence the rest of your life

Vor 3 Monate
Spooky d00d
Spooky d00d

Thats incredible! The fish scales create turbulence much like that of the gold ball

Vor year
Sarin Rahman Zavin
Sarin Rahman Zavin

This guy is so cool, even his advertisement is as interesting as his original content..

Vor year
Siddhartha Barua
Siddhartha Barua

Dude, this video was awesome!😃😍😎🤓...I particularly enjoyed learning about how turbulent flow helps airplanes fly more efficiently and fish to swim with no energy spent by the fish (even dead fish can swim upstream)!!!!

Vor Monat
Zachry Binks
Zachry Binks

Veritasium: Turbulent flow can be connected to a pattern of randomness that we still don't fully understand. Destin: ha ha perfect pressure make water go smooth

Vor 2 years
Blox117
Blox117

@Kyo i read it again and i get what he means this time

Vor 2 years
Kyo
Kyo

@Christophe Holman big brain

Vor 2 years
Digz Row
Digz Row

I love this meme format

Vor 2 years
Xion_Dan
Xion_Dan

When you mentioned that turbulent flow is Dissipative, does that mean that at some point the surface of Jupiter will became very organised/linear/boring like the surfaces of the remaining gas giants in our Solar System? Or are these storms powered by 'geo'thermal energy?

Vor year
Taylor Bertrim
Taylor Bertrim

Smarter Every Day is great, currently waiting for part 2 of a series on Kodak film from him.

Vor 3 Monate
TheOtherGuy
TheOtherGuy

I want to see more experiments on the flushable wipes

Vor year
Bing Boong
Bing Boong

If you had enough computing power, you could absolutely predict turbulent flow. It's not even hard to rationalize we just don't have the technology yet.

Vor 11 Monate
Subscribe to an Egg
Subscribe to an Egg

Veritasium: "Turbulent flow is cooler than laminar flow" SmarterEveryday:"So you have chosen death"

Vor 2 years
Cam
Cam

FIGHT FIGHT FIGHT FIGHT

Vor 2 years
Rakesh
Rakesh

Lol

Vor 2 years
xbzq
xbzq

To learn about just how flushable these flushable wipes are, look up the term "fatberg".

Vor 2 years
JOEY G
JOEY G

Shots Fired!!!!!! OUR Battle WILL B legendary

Vor 2 years
Katniss
Katniss

My exact thoughts lmao

Vor 2 years
Yasas Malhara Munasinghe
Yasas Malhara Munasinghe

Hey, your videos are really informative. Just a quick comment regarding 6:26. Blood flow in your body is NOT turbulent, it's laminar; even though the heart pumping may produce turbulence, this effect is nullified by the elastic recoil of the arterial tissue (what we feel as the pulse). Turbulent blood flow is problematic because it can cause blood to clot, thereby leading to strokes, VTE, etc. Just for your information, 😊😊😊. Great video btw

Vor 3 Monate
spurthi CHADHARAM
spurthi CHADHARAM

Thank you, turbulent flow can be prevented and warned against

Vor year
Matt Moss
Matt Moss

always blows my mind that this guy literally has PHD in making education science videos lol

Vor Monat
Jeff G
Jeff G

I would like to see a turbulent flow experiment with a larger area on a shallow bed with heat sources under it to see if it mimics the sun's surface.

Vor 8 Monate
ayden chaffee
ayden chaffee

I love how the quality of his videos haven’t changed in 7 years, and that’s a good thing for him

Vor 2 years
A
A

@Bude Lasial then explain why he has 15m+ subscribers and almost 2B views without much knowledge of the YouTube algorithm

Vor year
Lucky Johny
Lucky Johny

@Bude Lasial that doesnt mean vsauce suck

Vor year
إرين تاسكين
إرين تاسكين

Skases https://youtu.be/iW-aOvyO91M

Vor 2 years
Aaron Manna
Aaron Manna

I wish vsauce was still old vsauce, like Derek here is. New vsauce is still cool tho

Vor 2 years
Oliver M
Oliver M

Its a rare sighting among YouTubers.

Vor 2 years

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