12:15 I think you made a small mistake. The separated upper surface pressure field is such that the higher pressure in the LE causes a higher force component “backwards” in the (drag) whereas the lower pressure in the TE does the inverse, causing a smaller force component forward (opposing drag). In potential flow, these x-components cancel out (hence predicting zero drag) but here they change such that a total force backwards appears (aka pressure drag). Love your videos, thanks for the content!
fascinating job! Very intuitive. What's the next step to go beyond and be prepared to work on aeronautics? Engineering College gives the background, but what can one do by self-learning to expertise at aeronautics?
Thanks! I would start to explore projects you can DIY with open-source tools like XFoil (a vortex panel method solver), Simscale (a full CFD solver), and design tools like OpenVSP from NASA. This will get you designing and testing the flow over various objects you find interesting,
Professor, for inviscid flow, when an airfoil turns the airflow downwards, doesn't that reduce the momentum in the x-direction. Shouldn't this lead to drag by Newton's third law?
I think in reality it would and that would be bundled into viscous phenomena. But I don't think inherently the turning of the flow leads to x-momentum change on a basic level vector-field level. I can change the y-momentum of a flow field without impacting the x-momentum (though the rules of conservation of mass and basic fluid mechanics comes into play here too...). Not sure if I cleared things up or just confused myself further!
![Finite wing effects [Aerodynamics #15]](http://i.ytimg.com/vi/m6n_k5ArdwU/mqdefault.jpg)
![Finite wing effects [Aerodynamics #15]](/img/tr.png)
![Pressure gradients and separation [Fluid Mechanics #16]](http://i.ytimg.com/vi/hUFnQ0YDMgE/mqdefault.jpg)
![Airfoils and wings [Aerodynamics #13]](http://i.ytimg.com/vi/EtvOXTSFMKg/mqdefault.jpg)
![Turbulent boundary layers [Fluid Mechanics #14]](/img/n.gif)
the way you teach is very efficient and interesting sir, really nice work. thank you sir.
Glad you like it!
I absolutely loved watching your video. You're an amazing teacher 👍🏻
Ah thank you so much!
12:15 I think you made a small mistake. The separated upper surface pressure field is such that the higher pressure in the LE causes a higher force component “backwards” in the (drag) whereas the lower pressure in the TE does the inverse, causing a smaller force component forward (opposing drag). In potential flow, these x-components cancel out (hence predicting zero drag) but here they change such that a total force backwards appears (aka pressure drag). Love your videos, thanks for the content!
Thanks for pointing that out and engaging!
Exactly the point I was looking in the comments before I post mine
fascinating job! Very intuitive. What's the next step to go beyond and be prepared to work on aeronautics? Engineering College gives the background, but what can one do by self-learning to expertise at aeronautics?
Thanks! I would start to explore projects you can DIY with open-source tools like XFoil (a vortex panel method solver), Simscale (a full CFD solver), and design tools like OpenVSP from NASA. This will get you designing and testing the flow over various objects you find interesting,
Professor can you do some problem solving videos for this course? I think they can be very helpful.
Hi! Yes, I think in the future those would be really helpful.
Professor, for inviscid flow, when an airfoil turns the airflow downwards, doesn't that reduce the momentum in the x-direction. Shouldn't this lead to drag by Newton's third law?
I think in reality it would and that would be bundled into viscous phenomena. But I don't think inherently the turning of the flow leads to x-momentum change on a basic level vector-field level. I can change the y-momentum of a flow field without impacting the x-momentum (though the rules of conservation of mass and basic fluid mechanics comes into play here too...). Not sure if I cleared things up or just confused myself further!
Hey Professor, I have an aerodynamics exam, and I have few doubts on few questions , could you please help and guide me, Thanks in advance
Hi Fayaz, I can't exactly answer exam questions of course but happy to clear up any confusions you might have, if I can!
the content explanation is awesome but the handwriting font is terrible, hard to read. Pls select other types of font
Lol, that's just my handwriting. I can't even do the one font very well, no shot in learning to write a second one.
science fucking rules
Yes it does!