Understanding Aerodynamic Drag
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- เผยแพร่เมื่อ 19 พ.ค. 2024
- Get access to the extended version of this and other videos (without any ads) on Nebula - nebula.tv/videos/the-efficien...
Drag and lift are the forces which act on a body moving through a fluid, or on a stationary object in a flowing fluid. We call these aerodynamic forces (if the fluid is a gas) or hydrodynamic forces (if the fluid is a liquid).
This video is all about the drag force. There are two main causes of drag - first we have the pressure distribution around the object, which is particularly significant if flow separation occurs. And then we have the shear stresses acting on the object, which are most significant for streamlined bodies.
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This video is more useful than whole semester fluid course
True 😂😂👍.
It's the conclusion of our complete semester
That’s very unlikely 😂 what school do you go to
Exactly yAr..itne knowledge ke liye daily class,uske bad bhi concept clear nhi ho pata
@@a_s_3.o try prof Suman chakrobarty videos for fluid ( available in TH-cam). I have watched all of them. Really good to build elementary level concept.
Thanks,I love this vedio
Just finished my fluid mechanics course, this video sums everything up so elegantly. Love your videos!!!
69 likes. Perfection 👌
I failed that course 2 times in eng school 😂😂😂
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
Thank you :D
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!
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
Hi sir, what software applications used for animation
Thank you
please ....why hydrostatic forces exist in fluids and even in gases???
@@Bel...QWERTY1 due to the body force components ( eg :- due to gravity)
Once go through the hydrostatic law in fluid mechanics for better clarity
@@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
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.
….simplicity? 😨 high school physics student here haha
You'll eventually get it bro. Everything happens on its time.@@Insomnia_tic
Clear, concise, straight to the point, great illustrations, please keep doing those ! Hi from France !
The Efficient Engineer has actually encouraged us to prepare such videos because all videos in this channel are very descriptive and informative.
another gem of a video, keep up the great work you do!
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.
Really great! It's so rare to find such simple analysis while being thoroughly! Keep it up. I really enjoyed your comprehensive language.
Never seen or found a video with this level of detail! It's so well explained, just amazing!! Congrats!!
Thanks mate, glad there're people like you making this kind of content! I really appreciate it!
Incredible way to explain so complicated concepts in a clear an intuitive way. Really good job!!! Subscribed for more content!!!!
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.
Atlast ...... A video on drag, the way you explain concepts is really amazing..... Please keep uploading more and also more frequently
Sup nigga?
@@GuruPrasad-qu4vg chat on TH-cam comments 😂😆
@@shauryagupta4990 small world
As I said it many times, I wish someone explained me these concepts as well as you do back in the days!
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!!!!
Somehow you manage to cover the topics I'm coursing right now at Uni
Truly a gem of a channel
I am short of words to thank you for clarity of your explanations.
Thanks sir
Really well explained
One if the better explanations on this topic. Excellent work. Keep it up please!
Great video! Filled with lot of information. Keep posting. We just enjoying your way of creating video.
Very nicely explained and animated, great job as always!
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.
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!
Awesome, informative, and engaging video! Videos and channels like these will revolutionize education and learning for future engineers ❤️
Great video! I wish I had this at the start of my fluids course!
I was thinking about you from a while, I said to myself why didnt he uploaded something till the moment and here you are❤
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!
Which branch you're studying
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!
You are a legend well done efficient engineer brilliantly explained
As usual great content that is supplemented by stunning visuals 👍
What a legend man❤️
Helped a lot
Amazing tutorial 👍. Looks like whole fluid dynamics is discussed in single video. It Clears most of the doubt.
Took my fluids 1 exam yesterday. Damn, can wait to have fluids 2! Awesome content mate!
Another amazing video! Great work! Thank you!
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.
Brilliant just brilliant!
This helped me and my science partner a LOT Thank You!
This is an amazing channel. Keep up the good work
Brilliant Video as usual.👏👏 Always helpful, inspiring and motivational 🙌👏
cant thank enough for these videos of yours! Waiting for more
Mannnnn......why the hell do you explain so much gooooood.....you really explain clearly and hats off proud to the animation.....you the best
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.
It was awesome.
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Looking up to you for more Aerospace content.
Your all lectures are very useful for us thanks for making this video.🙏👍❤️
We did a viscometer experiment in a fluid dynamics course, we understood, but this explanation makes more intuitive and harder to forget
Excellent video. Thanks for the very well explained video.
You will go far. Thank you for helping me with static.
Thank you for the perfect job. Very well done!
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Really and informative video with clear concepts. Thanks
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Great work man .....
It's my humble request plz plz upload videos more often
Every time I watched your content, it feels like I assist a course of 1 hour! It's really long, but interesting content! :)
This video is out just in time for my fluid mechanics course , thanx
Hi :)
Absolutely brilliant explanation! 💯👍
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.
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.
Oh gosh how is so conceptually clear !
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Very good explanation, thanks!
I was looking for an answer for a project and here you are!
Man your work is just crazy, thanks a lot
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I thought you have over 1 million subscribers. Your content quality is so awesome.
Amazing helped a lot to understand from scrach
Great Video. Please upload the lift video soon. And a request to make a video on wind tunnel testing.
Your channel is wonderful!
Lovely explanation
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.
amazing explaination!!
Thanks man such a wonderful video
Most beautiful explanation on aerodynamics ever...👍🙏👌👌👌👌👌👌
Great job,very useful!
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i've learned so much from this single video 😀
your videos are astounding
Excellent video! Thanks a lot!
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.
Thank you very much! Very intresting!
Thank you for explaining!
This is amazing!
Great Explanation.......👍🏻
finally
love you man
please upload more videos on structural anlysis please
Love this channel
Amazing work.
Superb video!
Thanks alots for youruseful videos and i hope to continue uploading videos
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.
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)
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
Very good knowledge video!!
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.
Thanks Fateen! I agree - Introduction to Flight is a great resource.
This is really great
My best lecture ever
Many thanks sir
i'd just say..... you ought to get more than 316k subs bro. good job and keep up.
Wow you are a drag king 👑 thank you 🙏