Understanding Aerodynamic Drag

[@tmmyvrctt11]

This video is more useful than whole semester fluid course

[@naveenkondeti5494]

True 😂😂👍. It's the conclusion of our complete semester

[@og805kanker]

That’s very unlikely 😂 what school do you go to

[@a_s_3.o]

Exactly yAr..itne knowledge ke liye daily class,uske bad bhi concept clear nhi ho pata

[@arkitkabir6950]

@@a_s_3.o try prof Suman chakrobarty videos for fluid ( available in KZbin). I have watched all of them. Really good to build elementary level concept.

[@xinlulin6463]

Thanks,I love this vedio

[@rashedabuamoud7794]

Just finished my fluid mechanics course, this video sums everything up so elegantly. Love your videos!!!

[@FormulaJuan75]

69 likes. Perfection 👌

[@dantheman3022]

I failed that course 2 times in eng school 😂😂😂

[@mallikarjunv5]

0:00 - 0:30. Introduction to Drag (What is drag ?) 0:50 - 1:05. Why is drag an unwanted force ? 1:30 - 2: 18 How is drag generated ? and formula for calculation of drag 2:19 - 2:31 Components of Drag force (Pressure drag and Friction drag ) 2:32 - 3:19 Pressure drag in detail 3:20 - 4:47 Flow separation in detail 4:48 - 5:00 Why do golf balls have dimples? ( Dimples increase turbulence and hence reduce flow separation. Reduced flow separation means less "pressure drag" and so the ball travels large distance). 5:01 - 7:15 Turbulence and its effects on Pressure drag and friction drag 7:17 : 8:05 Ridges on shark skin as bio inspired solution to reduce friction drag. 8:07 - 9:31 Effect of geometry and the orientation on Total drag. 9:32 : 9 :51 Quantification of drag force through integral approach. 9:52 Simplified formula for drag force. 9:53 - 10:11 The drag coefficient and how it's calculated. 10:22 - 10:36 The reference area (Emphasis on the selection of Area.) 10:37-12 :25 Re Vs Cd and arriving at stokes law. 12:26 -13:26 Arriving at terminal velocity of a sphere. 13:29-13:53 Constructing a Viscometer (In breif). 13:57-14:22 Components of drag forces of particular interest in aviation

[@IAMDOGGGGG]

Thank you :D

[@aliptera]

The most intuitive and real physical explanation of all aerodynamic forces I can think of - is modification of static atmospheric pressure around an object due to air movement. Atmospheric pressure is defined by random bombardment of air molecules as per the kinetic theory of gases; this randomness is changed by the macroscopic air movement. As a result the pressure is modified around the object creating forces that we're labelling as drag and lift.

[@muhammadabdullah3467]

This video is essentially a summary of chap 9 in the fluid mechanics book by Munson. I love how this channel explains these important topics with such simplicity. Keep up the good work.

[@Insomnia_tic]

….simplicity? 😨 high school physics student here haha

[@muhammadabdullah3467]

You'll eventually get it bro. Everything happens on its time.@@Insomnia_tic

[@titorotod]

I got so excited to see this on the feed, I was long waiting for a video about this. I started working on computational fluid dynamics half a year ago and it took me a lot of time to learn the theory behind it. You make everything look so easy to understand, you truly are a gifted teacher. Cheers!

[@NikitaKaminskyy]

As I said it many times, I wish someone explained me these concepts as well as you do back in the days!

[@berkdogu8150]

The Efficient Engineer has actually encouraged us to prepare such videos because all videos in this channel are very descriptive and informative.

[@TheEfficientEngineer]

I hope you enjoyed this look at aerodynamic drag! I'll be covering lift in the next video. ✈️ You can get access to extended versions of this and other videos on Nebula - nebula.tv/videos/the-efficient-engineer-understanding-aerodynamic-drag-extended-version

[@rohi7597]

Hi sir, what software applications used for animation

[@urp8916]

Thank you

[@Bel...QWERTY1]

please ....why hydrostatic forces exist in fluids and even in gases???

[@naveenkondeti5494]

@@Bel...QWERTY1 due to the body force components ( eg :- due to gravity) Once go through the hydrostatic law in fluid mechanics for better clarity

[@Bel...QWERTY1]

@@naveenkondeti5494 If it is due to gravity why or how it exists on vertical surfaces..??..i find it really hard to be understood im sorry

[@alexanderunguez9633]

I really enjoyed that you pointed out that pressure drag becomes more significant for blunt objects and friction drag becomes more significant for thin structures(and pipes I should add). This is something that isn't specifically mentioned in a lot of literature, but is an important intuition.

[@shauryagupta4990]

Atlast ...... A video on drag, the way you explain concepts is really amazing..... Please keep uploading more and also more frequently

[@GuruPrasad-qu4vg]

Sup nigga?

[@shauryagupta4990]

@@GuruPrasad-qu4vg chat on KZbin comments 😂😆

[@GuruPrasad-qu4vg]

@@shauryagupta4990 small world

[@stefanguiton]

another gem of a video, keep up the great work you do!

[@naveenkondeti5494]

Wahh...! Solved many of my doubts regarding fluid mechanics in a single video. The best of best 👏👍. Engineers of our generation are blessed to have such sources. Thanks for providing such content and keep doing it.

[@Megadanne98]

This is not the first time you've managed to time your content with the same subjects I'm studying at the time , great video!

[@LJ7v]

Clear, concise, straight to the point, great illustrations, please keep doing those ! Hi from France !

[@mazenelgabalawy3966]

These types of videos and people like you sir are the reason I still have hope I can truly understand what university professors poorly teach.

[@magarinoskevin2063]

Somehow you manage to cover the topics I'm coursing right now at Uni Truly a gem of a channel

[@de0509]

Studying engineering and then watching this video = mind blown Theres always that missing piece of a puzzle. And for the study of fluid dynamics, I have no idea if humanity will keep unlocking all the secrets of the universe regarding this. I remember from a professor that told that a lot of these constants are found experimentally. I wonder if someday humanity can fully understand how these things are to a point where experimentation wont even be needed

[@chankokkeong802]

Fluid Mechanics All I learned from my previous study were solving maths problems only, my lecturer didn't explain the real examples such as golf ball, aeroplane wings, shark skin, etc and they are still getting high paid, Respect!!! That is why my country always poor, because they fail to educate and the cycle goes on.

[@dougball328]

A fun application of the terminal velocity is using a ping pong ball to determine altitude. To see whose rocket goes the highest, you eject a ping pong ball and time how long it takes to get to the ground.

[@LazieKat]

We did a viscometer experiment in a fluid dynamics course, we understood, but this explanation makes more intuitive and harder to forget

[@mosayed4792]

I was thinking about you from a while, I said to myself why didnt he uploaded something till the moment and here you are❤

[@monishreddy1797]

I watched this video more than five times completely, and each time I watch it, i understood this video better When i first watched it I had doubts like why turbulent flow delays boundary layer separation..why does flow separation cause dictate drag force..and how majestic is the graph at 11:44 I believe when I come back later, I would understand this video better.

[@michaelbabatunde3915]

I am short of words to thank you for clarity of your explanations. Thanks sir

[@qolbola_bilimuz4424]

brother, just watching the tutorial and thinking wow you put a good background music at such a level that helps the listener to concentrate many make it too loud to hear the speaker, great job.

[@mohammedfawaaz693]

Mannnnn......why the hell do you explain so much gooooood.....you really explain clearly and hats off proud to the animation.....you the best

[@gzizou_seif]

This video is out just in time for my fluid mechanics course , thanx

[@kytddjj]

Hi :)

[@engineeringarts4509]

This video is very excellent - clearly highlighting all the key issues about drag, e.g. how adverse pressure gradient causes flow separation, how dimples on golf ball change boundary transition to delay flow separation and in turn reduce drag, etc. These are very important concepts!!!!

[@ivansandoval946]

Thanks mate, glad there're people like you making this kind of content! I really appreciate it!

[@fateenahmed659]

This video is so amazingly great. For anyone looking to dig deeper, a very good book is "Introduction to Flight - John Anderson". It explains the math as elegantly as this video does and covers a whole whole lot more.

[@TheEfficientEngineer]

Thanks Fateen! I agree - Introduction to Flight is a great resource.

[@dougball328]

I would recommend a brief explanation of Reynolds number. It is the ratio of the inertia forces to the viscous forces. A simple example is fill a coffee cup full of water. Very slowly tilt the cup. The water will run over the lip and down the side of the cup. This is because the viscous forces are keeping the water attached to the cup. No tilt the cup more until the water flows out of the cup and into a stream away from the cup. Now the inertia forces are dominate. Having said that, I found the video to be quite informative and accurate. (As an aerodynamicist I designed airplanes for nearly 40 years, mostly commercial but a few others tossed in for good measure and professional stimulation)

[@elena6516]

One if the better explanations on this topic. Excellent work. Keep it up please!

[@LeoLanzi]

I study high school with mechanical technical in Brazil and my teacher shared your video to my class. Your videos are really good, keep doing that!!! Sorry if i made a mistake in english, i'm still learning. Peace!

[@myusername3689]

Lift induced drag simplified: Downwash tilts lift vector slightly backwards, lift vector backwards means that the lift is not only pulling upwards at the aircraft, but also backwards, which mimics drag. Downwash is caused by the shape of the airfoil and also caused or amplified by vortices.

[@dougball328]

Downwash is not caused by the shape of the airfoil. It is the result of the circulation generated to produce lift. L=rho* V*gamma) where gamma is the circulation strength.

[@asifraj321]

Amazing tutorial 👍. Looks like whole fluid dynamics is discussed in single video. It Clears most of the doubt.

[@kariossyr6018]

Really great! It's so rare to find such simple analysis while being thoroughly! Keep it up. I really enjoyed your comprehensive language.

[@AJ-et3vf]

Awesome, informative, and engaging video! Videos and channels like these will revolutionize education and learning for future engineers ❤️

[@andreasgrover8444]

This helped me and my science partner a LOT Thank You!

[@giovanniluddeni663]

From what I've read, shark-like roughness won't be advantageous for planes but mostly for boats and similar bluffer bodies, since the most of the gain comes from moving the curve Cd/Re in a way that makes the Cd to fall in the critical pit (the lower pit in the plot). Planes are obviously surrounded by a fully turbulent flow, so this would not be possible. It's the reason why golf balls have bumps while smaller/bigger balls are flat. Very nice video!

[@dougball328]

Riblets are another means of reducing turbulent friction drag. Riblets are microridges running in the direction of the local flow. The flow tends to sit on top of the ridges - the drag is reduced because the flow is not 'touching' the full wetted surface of the wehicle. As the video suggested, implementation is the issue - as well as how to maintain the integrity of the surface.

[@abdelrahmanelnabawy7434]

bro your videos is significant worth the time

[@amaarquadri]

Great video! I wish I had this at the start of my fluids course!

[@dougball328]

The Efficient Engineer alluded to asymmetric vortex shedding leading to instability but never went any further (at least not in this video) A good example of this is the baseball knuckleball. A pitcher throw the ball trying to not spin it. By not spinning, the laces do not trip the boundary layer. The flow separates somewhere on the ball and this sheds a vortex and causes a force imbalance. This shedding moves around the ball, the forces change and push in different directions, and thus the ball's flight path is erratic. The curve ball is just the opposite. The pitcher spins the ball rapidly so that the flow goes around one side more than the other. This produces a 'lift' (or sideforce) thus causing the ball to curve.

[@KrishnaCalling]

Please continue series on aerodynamics ...your videos are just superb...i request you

[@sohanherath4610]

Brilliant just brilliant!

[@jyotiprakashhota8568]

Actually i was studying in my online class about the same thing, but how did KZbin knew what i was hearing in the class?🙄

[@calculusguru1063]

You are a legend well done efficient engineer brilliantly explained

[@DigitalvideotoolsOrg]

I am an aeronautical engineer. This video is spot on.

[@Obi1-KenBone-Me]

this 16 minutes video was more helpfull then the 2 hours i spent trying to understand the drag chapter from the principles of flight manual

[@faaizansari6908]

@ 6:25 it should be steeper in laminar than in turbulent boundary layer. By the way, cheers to your work man👍

[@jishnuram5777]

Yes i also think so pls correct me if i am wrong

[@mecheazy5028]

Yes!

[@pedroferrer9436]

He is right because stress is proportional to dv/dy, so turbulent is steeper in reference to the y axis

[@TheEfficientEngineer]

Yes Pedro is correct. By steepness I'm talking about how quickly the velocity changes as you move away from the surface. The change in velocity is more gradual for the laminar profile, and so the shear stress is lower.

[@arkitkabir6950]

For turbulent flow although velocity gradient is high and flow is unsteady, when we take statistical average it generally provides uniform profile unlike laminar where it gradually increases. Hence above velocity profile is correct.

[@ratfor19]

Never seen or found a video with this level of detail! It's so well explained, just amazing!! Congrats!!

[@rlshunt824]

This guy should have 1 M subscribers.

[@RealityVision]

Most memorable and happiest success is achieved when you do a work with much deeper and broader view, with sharper focus. Everyone succeed in life but that should be happier and sweeter to you and your environment 😁 have a nice day 😊🙏

[@kirbacilpezo]

You guys doing very good job man. A civil engineer I appreciate it.

[@vishnuprabhu1722]

Great video! Filled with lot of information. Keep posting. We just enjoying your way of creating video.

[@ingGS]

You are the best, you are the absolute best.

[@chrisdalg89]

Incredible way to explain so complicated concepts in a clear an intuitive way. Really good job!!! Subscribed for more content!!!!

[@deepeshyadav1303]

I was looking for an answer for a project and here you are!

[@centaureacyanus7026]

Incredibly well explained! I honestly can't say how grateful I am for your videos, which really help for my engineering studies. Thank you so much!

[@syedsaqlain3434]

Which branch you're studying

[@redpheonix6307]

i'd just say..... you ought to get more than 316k subs bro. good job and keep up.

[@gustavocortico1681]

My friend, I hope you are making money, because you deserve it.

[@Ostsol]

Very informative! I was initially thinking that the basic drag equation was naïve, but it turns out that I was naïve. 'A' is not measured in the same way for all shapes.

[@guillaumequerinjean218]

Took my fluids 1 exam yesterday. Damn, can wait to have fluids 2! Awesome content mate!

[@mlfb01ag]

7:18 Shark skin 8:05 Shape of body and angle of attack, plate 9:08 Friction, pressure, and total drag on graph 11:45 Stoke's Law

[@jeemain9071]

No wonder why your video takes large time🤟🤟🤟🤟🤟

[@santoshmaurya87]

Your all lectures are very useful for us thanks for making this video.🙏👍❤️

[@ashrafulislam7021]

I thought you have over 1 million subscribers. Your content quality is so awesome.

[@Skylikesavation]

Sharkskin feels strange like smooth rubbery sand paper

[@brunomartel4639]

This is art

[@russellchattaraj1217]

Oh gosh how is so conceptually clear !

[@wathsalahiruni646]

you explain these brilliant way❤ there are more complicated to understand lecture note😢

[@Cleydetapias]

O carro/Autorama chassi tubolar corre no trilho sem contato a dianteira na plsta com pesinho esquerdo/Direito; A bolha lisa e a aéro-dinâmica só acontece com duas acrílicas lado esquerdo e Direito tendo como função entrada e saída do ar cravada ou seja a carga que entra igual a que saí, Entrada inequalizada e saída equalizada de acordo com a carga da tração; exemplo conceito F1, Parabéns pelo conteúdo!

[@sriharsharevu4316]

Wowwww....not only efficient but more output.

[@sameerdesai9494]

cant thank enough for these videos of yours! Waiting for more

[@A.Hisham86]

Every time I watched your content, it feels like I assist a course of 1 hour! It's really long, but interesting content! :)

[@NeeXnBeatz]

Man your work is just crazy, thanks a lot

[@mohabsoliman7172]

There's two types of videos short simply explained filled with infos and hard to produce like your videos . the others are long , often includes an indian guy or an old professor of some developing country , that says the words in some refrence , they only require a camera , and you usually understand nothing in the end. we pass exams and understand concepts thanks to the firs ones like yours and fail because of the second ones.

[@carmelpule8493]

If the wing is moving forwards in stationary air space, the drag is the force required to ACCELERATE forwards mass of air near the wing.. If the air is moving in a wind tunnel with the wing stationary, the drag is the force required to DECELERATE the mass of air near the wing. ( parallel to the wing flight path) LIFT is created by ACCELERATING the air mass particles downwards ( orthogonal to the wing flight path) using compression effects below the wing and a partial vacuum effect above the wing.

[@Henry-tong]

this video is amazing i've learned so much from this single video 😀

[@ryan_christopher97]

Hey man, you're a legend and your videos are sensational! ❤️

[@dresdenkiller]

This video was anything but a drag!

[@Innotutorial]

Brilliant Video as usual.👏👏 Always helpful, inspiring and motivational 🙌👏

[@tacoclocker]

A lot of help for my biomechanics course

[@vlatkopopovski2685]

Low pressure makes force normal to the contact surface (chord), and in this angle of attack, the Lift component is then times bigger than Drag component

[@smitboraniya6752]

I learned more than what I had learned in my fluid mechanics cource of mechanical engineering. And most importantly Many doubts of mine are cleared in this video.

[@faizansultan8067]

finally love you man please upload more videos on structural anlysis please

[@Daniel-S1]

I wish I was smart enough to need the extended explanation!

[@gaeb-hd4lf]

damn these animations are top notch

[@adityagandhi7085]

Great Video. Please upload the lift video soon. And a request to make a video on wind tunnel testing.

[@excalibur2889]

Great work man ..... It's my humble request plz plz upload videos more often

[@Peter-nighthawk]

Thank you for the perfect job. Very well done!

[@MuhammadArslan-ne8fi]

The app is as Brilliant as this Channel.

[@sachinsahani6117]

Amazing helped a lot to understand from scrach

[@crustybasterd1352]

Amazing channel, so glad I found it!

[@jayantachanda1383]

Thanks alot. From past 1 week, I am curious to learn about Aerodynamics. From 2 year of BTech in Mechanical Engineering, I love Fluid mechanics and always curious about it. So I took Thermal Engineering in MTech. My request to you that please post content related to Fluid Mechanics.

[@arkitkabir6950]

Try prof Suman chakrobarty videos ( available in KZbin) for fluid mechanics. They have explained concepts really well.

[@blackguardian89]

Another amazing video! Great work! Thank you!

[@Thierry080]

Very nicely explained and animated, great job as always!

[@safooh94]

As usual great content that is supplemented by stunning visuals 👍

[@shafaqparveen5070]

Really and informative video with clear concepts. Thanks

[@sudhidm3122]

Most beautiful explanation on aerodynamics ever...👍🙏👌👌👌👌👌👌

[@elpaso4765]

Your channel is wonderful!

[@dweeder1453]

Really well explained