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hello, us the question show im trying to do a CFD analyse of a USA 35B airfoil more specifically i m trying to add a double Leading edge Slot Configuration like Make Patey Did to my Airfoil, I can't seem to find any book or Tutorial that deal specifically about Leading edge slot ether about how to design them or how do they effect my CFD set up, if any of you have Experience or know of book that deal with subject please comment that that would be a big help.

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Hii, I have read some books about F1 and physics aroumd It and i hard an idea about a prototype that I wanna make some experiments with It, someone know how i can make some sketches and simulations and a 3d model of this?? Thnxx

Hello, How can one calculate the exact Center of lift and Center of pressure for any aircraft, including ones with non-standard wing configurations. I have access to Autodesk CFD if I need to use it.

Hello,

I'm looking for some common inverted airfoils that aircraft have on their horizontal tails. My purpose of doing this is to counterract the main wing's moment without having needing a massive tail arm or a massive horizontal tail. I would really appreaciate if anyone can recommend some popular airfoils or some resources which I can use to research (other than airfoiltools.com).

Looking for someone interested in designing a DYI pipe. It needs to have a perfect laminar flow, I will provide precise details on the objective of the heat being applied and purpose. Any interests?

I'm trying to build a model jet engine. Not for real, with fuel, just to understand how it works. I'm making it out of PETG. I'm working on the fans to compress the air. The fans attach to the cylinder in the picture below and there's a motor there to turn them. Without the cone on, the air blows great. But when I put the cone on, I want that to compress the air and make it go out faster. But instead nothing comes out and the air all comes out the back. Why does it do this?

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https://preview.redd.it/97yeerub00oc1.png?width=920&format=png&auto=webp&s=d08aeb7bc3cae4d3627e3d5888095825e489675f

This holds the DC motor and fits the shaft of the fan blades

I've seen many new 2 wheeler city electric scooters quoting drag coefficient and are made streamlined in design comparing to previous ICE models.

Since it's not for performance, the passenger are sitting upright travelling causing more frontal area.

With that frontal area , does any effort from aerodynamicist effect the vehicle economy? If yes ,How?

https://etimg.etb2bimg.com/photo/69841284.cms

Maybe I don’t understand the aerodynamics of racecars good enough, but I heard someone say open wheels are very bad for aerodynamics (ex when you take the tesla car with bigger tires it isn’t able to drive as long as the other).

Why do cars like F1 have open wheels? Is there another reason? Is the problem not as big as I think?

Id like to borrow some of your time to read my background a bit.

My background: I studied automotive engineering (Bachelors) and Business (Masters) My final year engineering project was Truck aerodynamics with CFD, i wasn't interested in engine , chasis eng. It was just vehicle aerodynamics a e CFD for me.

So out of b school, pivoted , started own export firm in a non engineering field (as a means of income and investment) . I'm done with that.

Now, I want to get back to being an aerodynamicist and start from where I stopped,from the very bottom . after much search , yesterday i landed an remote internship in CFD, currently awaiting instructions on the job.

I think I'm in the right path, I believe there must be experienced aerodynamicists here , I would appreciate your thoughts on this. If possible you could provide a road map idea for me to work on

Thank you all for taking time to read .

I want to learn more about aerodynamics and would love to (at least try) get a deeper understanding of it. How could one learn on their own? I already saw some lectures on youtube, good idea? Any books I should read? Other methods of learning?

Any amount of information is appreciated :))

Did you know that millions of children worldwide throw boomerangs hoping they'll return, only to face disappointment? If you've experienced this, you're not alone. We're Enlil, a group of physics enthusiasts turning our obsession with flying things into creative designs.

Enlil is all about exploring aerodynamics and flying discs. We will work on questions like: Can we design a boomerang that follows a special trajectory before returning? What revolutionary airfoil designs could change human flight?

Our goals: Experiment with various airfoil designs (literally anything from discs, and drone propellers to paper airplanes) and flight characteristics. Document our findings and publish research papers. Build a supportive community passionate about physics and innovation.

What we'll do: Group readings and discussions on aerodynamics. Brainstorm and showcase different disc designs. Prototype and test our creations with 3D printing. Participate in local competitions and share our progress online.

Who should join? If you're curious about the science behind flying discs and eager to explore new possibilities, Enlil is for you! So, if you're intrigued, DM me to dive into the fascinating world of aerodynamics with us!

The explanation I know for why aerodynamic forces are proportional to velocity squared, not velocity, is that you're interacting both with more particles in a time period AND with more force. But kinetic energy is itself proportional to velocity squared (for reasons I don't know...), so why aren't aerodynamic forces proportional to velocity cubed? I'm guessing there's a distinction between "force" and "transfer of energy" I don't understand, but that raises the question of what it means for induced drag to be a consequence of "energy" being conserved.

Thanks!

Goal is to simulate the dropping of a bomb from a half-wing into a fluid flow using ANSYS Fluent. The meshing is done, but I'm facing issues with separating bodies in Fluent.

The plan is to drop the bomb at different speeds (1 m/s, 2 m/s, 3 m/s) with a fluid flow relative velocity of 200 m/s. And how store(bomb) orientation would react to different dropping velocity.

I'm uncertain about which model to use and the proper steps for setup. If anyone with aerospace simulation experience could provide insights without violating any rules, I'd truly appreciate it!

Hello everybody, I am trying to calculate AoA required for helicopter with mass of 700 kg to be able to hover. I have question regarding the speed of blades and blade area. Helicopter itself has 3 blades, diameter is 7.2 m, RPM is 530. What kind of numbers should I put into this equation regarding speed blades travel and their area?

I don't expect a direct answer. I'm just trying to learn how to approach the question.

If I wanted to reduce the length of the tail, can I just make it bigger to compensate?

Somehow flying wings and delta wing planes make this work. Do they do something different? Or just take the basic reduction in tail length to the limit?

Hey! so i am doing my physics extended essay on how the angle of inclination of the DRS wing affects the downforce of an F1 car. For this, i am planning to make a scale model of a rear wing for which i am considering if i should use an actuator to activate the wing (will change AOI with each iteration), or should i manually change the wing angle after each iteration/data entry.

Also if you have any suggestions for the project please let me know!

That's the question basically. I understand that I should aim to channel as much air as possible under the car by curving it upwards, I'm just scared of overdoing it and creating lift. I couldn't find any proper literature on it so that would also help a lot.

Thank you in advance

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I´m unable to find any kind of NACA code for the 219´s airfoil, and I need some info about its lift and drag kind of urgently. Any web to search for it or anyone that can source it for me?

Thanks in advance!

Trying to learn more about vehicle Aerodynamics.ive studied the basics.

I'm trying to understand more on the approach and talent of aero engineers responsible for efficient EVs by design

Can someone explain the design philosophy behind the rear wings which have such a design. The ends of the wing seem to be at a higher AoA compared to the one in the middle.

I tried searching, but I wasnt able to find any solid explanation.

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https://preview.redd.it/hcmnjgnjijkc1.png?width=391&format=png&auto=webp&s=e6d58c147ef6e8bc4e290ab3a1c140de2a36df24

Hi! I was going through some CFD post processing images for the flow over a car, and came across a delta CpZ contour. The reference said the higher value colour band represents lift surfaces while the lower value band represents downforce. The contour showed slightly higher values of delta CpZ on the bonnet. My question is, how is this producing lift? Doesn't the bonnet require to have a higher pressure than the leading edge of the floor so there's some front downforce? Am I analysing the concept of CpZ wrong?

Thanks!

Hello, I’m a masters student and in my masters thesis i chose to work on the aerodynamics of a NACA profile, the thing is my supervisor isn’t familiar with aerodynamics nor is he familiar with the literature so basically I’m going to have to guide myself through this so I’m seeking you guy’s help on introductory papers on NACA profiles from a theoretical point of view (whats the Cp and Cm…..) and some results for me to validate my simulation results with, please help me I’m lost.

Hi all,

I'm starting uni and am looking to find a very low drag design for a small scaled solar powered car. The race is basically a straight line and one turn at the end.

My question is as follows: if you look at any sports car construction now, every single one has a very low ground clearance as a result of the hardware required. In electric cars the lower part of the car houses the battery and so forth. Is it more aerodynamically efficient if you could construct a car that was off the ground and acted as a horizontally stretched teardrop basically? i.e a car that is the same width as a regular car, but has a higher ground clearance like 30-50cm and where the total height of the car is under 1.5m. In this case imagine a human is basically lying down like in an f1 car.

The photo attached sort of demonstrates what I mean.

https://preview.redd.it/e5piza3dtnjc1.jpg?width=1280&format=pjpg&auto=webp&s=c26980fdb67e1b13df2cfe3d677a30d3c7c606f9

I hope that makes sense but the tldr: is there a purpose to having a car that is super low to the ground if you didn't have the restrictions of an engine and upright seats.

So right off the bat, I realize my question is both dumb and way too complicated, and I apologize for that. But this is a serious question...

I am in the process of designing a custom-built flat-bed cab-over truck camper (~11ft long, 7ft high, 79" wide) on top of a 2017 Ford F150). I am both dumb and nerdy enough to want to design it ahead of time to be aerodynamic to increase fuel economy. Since I am making it myself from scratch, I can give it curves that might be impractical for commercial builders. I don't expect a large fuel economy savings, but even 2mpg would be fantastic.

So far I'm aware I need to basically cover the wheels, cover the underbody, add boat tails, a sloping foil between the cab and over-cab topper, make all vertical and horizontal corners rounded, and that generally speaking creating a teardrop shape will help quite a bit.

However, the practical limitations of taking an existing truck shape and adding a big box on top obviously limit how "teardrop-y" I can make this thing. So what I'm mostly looking for is advice on how much to try to put into optimizing the shape(s) of the cab-to-box area, shape (and length?) of the rear of the box, and how to figure out dimensions, angles, etc that would be useful (I know if you go too much one way or another with the teardrop shape it'll just create more turbulence again). But mostly just looking for what kind of angles I should use towards the rear, since the shape of the rear seems to have the most drastic impact (depending)

Again I apologize for perhaps asking too much. Happy to take pointers on where to go to keep researching. Thank you!

I can't wrap my head around what way the air would hit the surfaces. Would you use a teardrop profile facing inward or outward? Or some kind of oval, because the air is hitting both sides of the rods? If you would use an oval, what shape should it have?

Stand proud we alone are the lifted ones