Kutta Joukowski theorem [Aerodynamics #10]

In this lecture, we formally introduce the Kutta-Joukowski theorem. This is a powerful equation in aerodynamics that can get you the lift on a body from the flow circulation, density, and velocity. By taking a deep-dive into the rotating cylinder elementary flow, we derive the Kutta-Joukowski theorem through example.
Free downloadable notes (PDF with white background) can be found at my website: sites.udel.edu...

[@kathrynslavny763]

your a better teacher than my own aerodynamics teacher that gets paid to teach me. It’s amazing that a free source like youtube videos can be more helpful than my expensive classes I pay for in college

[@prof.vanburen]

Aw! I'm glad you find it helpful and good luck with your classes

[@jafinhasanomar1037]

I'm from Bangladesh & the story is the same. Where are you from?

[@alanj.walker7747]

What a masterpiece! What a masterpiece! By every passing minute, I simply can't hold my urge to write this comment!!! This video is a master piece and Prof. Buren, you are an amazing, passionate and exceptionally good at delivering stuff like this! Amazing! I'm just blushing, the way this is explained so smoothly, crazy!

[@prof.vanburen]

Thanks for the kind words Alan! I am glad you like it.

[@jaxonterrace8263]

Wtf

[@Mechanica55]

@@prof.vanburen I bet your mum wrote that.

[@prof.vanburen]

@@Mechanica55 media.giphy.com/media/CE253lLSLlL68/giphy.gif

[@bristyhaque2131]

After completing the whole playlist of Aerodynamics , I just wanted to say "Thank You, Professor.Thank you so much!" . You're amazing , Sir..

[@prof.vanburen]

Thank you and glad you liked the material!

[@willm6598]

This is literally saving me in the class I am in, I am so grateful for these videos. This is the part of the book I just didn't understand, and the way you explain it is one million times better than the way the book teaches it. Thank you so much, I hope you keep making for videos!

[@prof.vanburen]

Good luck with class!

[@wffff2]

Especially like how you explain the causality of the lift and circulation at the end. The analogy between lift's circulation and pedestrian's footprint really helps clarify. Thanks a lot.

[@prof.vanburen]

Thanks, I'm glad you liked that part!

[@abhinandok190]

Thanks Professor,
Really amazed.. The efforts you put to make these video is really incredible.. you made my advanced fluid mechanics classes super easier 🙏🙏

[@prof.vanburen]

Thank you and good luck in advanced fluids!

[@phantomimmortal9962]

Thank you very much for providing these, they're incredibly helpful. Around 10:00-11:00 when we're plugging in cp(theta) and integrating, it looks like a number of the signs are flipped from how you had them written at 8:44. All the terms go to 0 so it doesn't ultimately affect things, but is that just a typo or did I miss something?

[@prof.vanburen]

Thanks for pointing this out! It certainly seems like it could be a sign slip-up, so you're probably right. My students are constantly pointing out typos in my notes, I guess it would be no different in the online videos either.
Thanks for your attention to detail and I'm glad you are finding the videos helpful!

[@kelpilot]

It was so useful, I was wondering how can we use circulation method to find lift? Because it isn't spinning. Then I finally found this video and there are no more question. Thanks a lot...

[@prof.vanburen]

Glad you like it!!

[@NehaYadav-jf2ss]

The method used by you is amazing! It was so engaging and it helped in clearing my basics. Can you make a video on how to choose an airfoil for a fixed-wing UAV, design and things we need to keep in mind?

[@prof.vanburen]

That's a good idea, there's so much that goes into choosing the right airfoil. In a UAV application, it depends on what you want - max lift, min drag, max lift/drag ratio, max performance range (UAVs can be small and experience gusts, so a wide range of velocities/angles in a single flight). Once you have an idea of what you want to optimize for, you find your expected Reynolds number then start exploring existing airfoils (something like airfoiltools.com is good here) or optimize design your own!

[@NehaYadav-jf2ss]

@@prof.vanburen yeah, I've used that too.
I'm doing calculation for eVTOL fixed wing from scratch. Initially I faced problems with the approach that is why I wanted some help.
I've read research papers related to that, but I'm looking for someone like you. The way you simplify things, it is a sign of excellent teaching and conceptual understanding.
If possible please make a video on that.
It'll be a huge help. Thank you!

[@david_porthouse]

When a cylinder starts to rotate clockwise, it is surrounded by anti-clockwise vorticity in a boundary layer. As this layer thickens up under the action of viscosity, it is convected away by any crossflow. This leaves the cylinder as a naked vortex which then produces a transverse force.

[@prof.vanburen]

Yep!

[@uxieitachi6270]

U made things look so simple

[@prof.vanburen]

Thanks!

[@franchino4895]

Can you help me to understand why at 8:13 we have Cd equal to 2 integrals one positive and one negative, and then at 9:10 Cd became a unique integral with minus sign? I do not understand the minus sign. The same happen for Cl.

[@prof.vanburen]

It has been a while since I looked at this lecture! I think it is because earlier in the video we are considering generalized calculation of lift and drag from the upper and lower surfaces of generic shape. Further down, we consider just a cylinder which has simplified versions of the equations. I will have to re-watch in detail just to make sure that's the case.

[@Auday365]

Great video thanks for sharing

[@prof.vanburen]

Thank you for watching!

[@aeroada]

thank you very much. Anderson's book explanation was not clear, but your lecture was an enlightenment ^_^

[@prof.vanburen]

Ah thanks! I really appreciate the kind words.

[@vidhimittal513]

Sir your classes were really good can you please whole syllabus of aerodynamics for aeroplane engineers

[@prof.vanburen]

Thanks! You want my aero class syllabus? Shoot me an email with what you're looking for at [e-mail]

[@smilemehta5378]

Hii vidhi😂

[@vidhimittal513]

@@prof.vanburen ok

[@norwaydude96]

thanks - helpful for my hydrodynamics class :)

[@prof.vanburen]

Happy to help!

[@ThomasHaberkorn]

How does the airfoil shape produce rotation?

[@prof.vanburen]

Do you mean generally how a foil might turn the flow downwards, producing the circulation that is the footprint of lift? Or how in reality the no-slip boundary leads to a boundary layer full of rotational flow?

[@ThomasHaberkorn]

@@prof.vanburen the latter. I think this validates the Kutta condition

[@amanaryan4667]

sir please use white board as the background.

[@prof.vanburen]

I have always preferred black, it saves the screen/battery/eyes. However, my website has the notes in a white background if you find that helpful for reading/printing:
sites.udel.edu/vanburen/education

[@emanalihashem2915]

Thank you sir

[@prof.vanburen]

No problem!

[@harisheswar6319]

Sir can you please take classes on cfd

[@prof.vanburen]

I wish I knew more about CFD! Definitely in the future I can get some more detailed CFD info up, unfortunately there are so many types of solvers and flow situations it's very difficult to teach generally. I give a brief overview of CFD in my Fluid Mechanics playlist series.

[@doguskutay]

Thanks.

[@prof.vanburen]

No problem!

[@omido6604]

LOOOOVE IT!!!

[@prof.vanburen]

Nice!

[@sasa_codm]

you are insane !!

[@prof.vanburen]

Thanks, I think!

[@AadarshPandeyop]

Hope this helps on my project proposal:)

[@prof.vanburen]

Me too! Best of luck.

[@AadarshPandeyop]

@@prof.vanburen it helped tysm

[@nadiachaoui9176]

if cpu =cpl than why cl not = 0 ?

[@prof.vanburen]

Hard to answer based on this, where in the video are you referring to?

[@hakeemcanonio3840]

12:43 Very important

[@prof.vanburen]

I think so!

[@xmnemonic]

Neetcode of aerodynamics

[@prof.vanburen]

Oh @NeetCode 's stuff looks awesome, thank you!