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Questions tagged [aerodynamics]

A subset of [tag:fluid-dynamics] concerning primarily forces such as lift and drag generated on bodies as they move through gasses or as gasses move through the body (typically air).

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But how exactly do you calculate the Joukowsky Airfoil, within a minimal margin of error?

After reading a fair bit of theory around the uses of conformal mapping to solve for the forces of lift acting on a wing, or a 2D cross section of the wing, in relation to the angle of attack. However ...
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Does Magnus spin force affect our Earth?

Any spinning moving object experiences a Magnus force. How much does our spinning Earth experience?
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How to calculate the drag coefficient of a cyclist?

I am working on a short paper where I explore the aerodynamics of a cyclist. I want to find the drag a cyclist generates, but I do not know how to find the drag coefficient. Does someone know of a ...
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How to calculate the drag force of a cyclist and the drag coefficient?

I have a creative math assignment which my class was tasked to do. Thus I decided to create my work on physics, more specifically aerodynamics. I want to create a function which calculates Drag with ...
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Equations behind mist formation around wings of fighter jet while doing acrobatic turns [duplicate]

Can some point me around equations to study for clouds formations around fighter jets while taking turns at high speeds as witnessed in Ace Combat 7 video game. I want to implement this phenomenon in ...
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2answers
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Why is the cone shaped space capsule free fall through the atmosphere bottom forward the stable orientation?

It seems the stable orientation of the cone shaped space capsule while free falling through the atmosphere is having the bottom point towards the translational velocity relative to the atmosphere. Can ...
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3answers
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A drone, or any lifting vehicle, enclosed in a container. Will it lift along with the container? [duplicate]

Consider a drone, or any lifting vehicle, enclosed in a container. Will it lift along with the container? Suppose I place a small drone in a large container of negligible weight and place them in ...
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16 views

Magnus effect without windspeed

Canagnus effect take place if windspeed is 0 ? Lets assume that our frame of reference a place an earth (e.g. soccer pitch) .We measure the windspeed and we find it zero.But if we make a knuckleshoot ...
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Is the derived equation for the lift coefficient showed below for an airplane in orbit right?

For an airplane flying in an orbit around the Earth the gravitational force minus the lift force would equal the force caused by the acceleration towards the centre of the Earth. $$ \frac{GM_Em}{(R+h)...
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Is lift force proportional to size?

I'm trying to calculate lift force of a particular object I'm working with. However, I can't find much information on how much force is required for an object to stay in flight though. My questions ...
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64 views

Principle of Lifting of an Aircraft [duplicate]

While using the Bernoulli's equation to deduce the upthrust on an aircraft , a statement is always made that The air particles going above th wing have to cover a greater distance in same time than ...
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Would it generate a lift if wind is circulating inside a nearly closed tube?

For a setup like the below image, would there be a lift generated to the tube, due to bernoulli effect?
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Angle of Attack of a propeller blade

What will be the best angle of Attack for a propeller blade that is in the airfoil shape?
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31 views

Propeller blades flat vs wing shape

Does a propeller blade with the shape of a wing produce more lift than a flat blade and will a blade with a wing shape produce lift in a ducted fan situation?
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Why does the increase in velocity result in decrease in pressure in a flow? Are there any explanations behind?

So I have been searching for this answer that why would increase in velocity result in pressure drop and found no explanation, please help, thanks!
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How fast do the aerodynamic forces on a surface build up?

I`m currently working on my thesis in the field of active car aerodynamics. In order to design a controller to move parts of the cars body I need to know how fast the drag and downforce acting on this ...
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Pressure distribution around an aerofoil

Some notes that I'm reading right now show a picture of the distribution of pressure around an aerofoil with zero angle of attack. The notes say that the pressure is identical at the top/bottom ...
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What's the equation for a streamlined body? [closed]

I'm interested in doing some simulations with aerodynamics, but I don't know what kind of curve a streamlined body actually is. Is there any kind of Cartesian formula for it?
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Aerodynamics of cycling into a tail wind

I was looking at Steve Gribble's Cycling Calculator , and I noticed that the aero resistance was higher going 40 mph with a 20 mph tail wind than going 20 mph with no tail wind. Why is this? I always ...
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What would be the expected result of a slowly rotating pressure sensor in a constant flow velocity?

Let's say I have a small pressure tapping aligned with a fluid flow in a wind tunnel. Pointing into the flow would yield the stagnation/total pressure. If I were to rotate it slowly and plot measured ...
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1answer
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Lateral Force on a Fin

I am wondering what the lateral force is on the fin of, say, an arrow, (or other befinned missile) as a function of the angle through which it is turned ... or more particularly what it's dependence ...
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1answer
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Motion of a contrail “vortex”

I want to understand what causes this motion on contrails (Cirricular motion) and it’s name if possible. What effects it? How and why is it formed?
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When does a closed tube with purely supersonic flow experience shocks?

If you have a cylindrical tube with all the gas moving at a mach number of exactly $M = 2$, will there be any shocks experienced? (In this case, the velocity may change, but the pressure would also ...
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101 views

Shock waves at $M = 1$ and $M > 1$

When a wave moves faster than the local speed of sound ($c_s$) in a fluid, there is a shock wave since the fluid is unable to respond to the moving wave. Even if velocity ($v$) is constant, if ...
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How do you explain the formation of shockwave on the wing surface during near sonic flight?

Explanations of shockwave for the common folks (youtube videos, googling) all tend to focus on successive sound waves generated by the air craft traveling outward in circles (sphere). That to me, ...
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1answer
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Unconventional Propeller Efficiency

I am very inexperienced in propellers and fluid dynamics, but I have been experimenting with propellers. I messed around with propellers between 2 and 12 blades; theoretically, its obvious that the ...
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1answer
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Effect of Bodyform on Air Resistance [duplicate]

Visualize those little pictures as the front of vehicles like airplanes and trains. I wonder if I am right about my speculation below, and if so, if somebody could explain the exact reason. Sources ...
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How does gravity effect to aircraft in sky?

Aside aerodynamics and buoyancy, Is there a simple way to explain how gravity is negligible in flight paths using free falling body diagram? In a parabolic trajectory,we know that at max height, ...
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Does aerodynamic heatings at the wall depend on the material of the wall itself?

I am reading "Fundamentals of Aerodynamics" 5th edition, J.D.Anderson. He said: "The slope of the temperature profile at the wall is very important; it dictates the aerodynamic heating to or from ...
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1answer
57 views

Why is the polar diagram of an airplane depended on weight?

Can anybody answer this question? Although aviation-related, it is in fact a fluid mechanics problem: https://aviation.stackexchange.com/questions/54192/why-is-polar-curve-of-a-glider-dependent-on-...
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Density of ionised air

Is ionised air less dense than ordinary air, if so, by how much?
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1answer
59 views

Parameters of the ground effect

I'm trying to build a large, rotary-wing Ground Effect Vehicle. In order to calculate the necessary size of my props and motors, I need to know how much additional lift the ground effect will provide ...
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Is it possible to knock over a bowling pin without hitting it?

I bowl professionally and there is a saying when you barely hit a pin and it barely falls over. People say that you "hit it with the wind." I've been thinking, is it actually possible to knock over a ...
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2answers
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Why does Anderson ignore a derivative of a normal viscous stress?

I am reading "Fundamentals of Aerodynamics" 5th edition, J.D.Anderson. In part 15.6, he said: Consider a steady two-dimensional, viscous, compressible flow. The x-momentum equation for such a ...
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Questions about shapes and the reason behind the drag coefficient differences

What is the reason that a streamlined body has a drag coefficient that is lesser than the drag coefficient of a streamlined half-body, when the latter has a completely flat bottom, while the former ...
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How significant is the material in drag force calculations?

I went to Wolfram's "Drag Force Calculator" and received 4900 newtons for a cone that has a radius of 3 meters and a height of 3 meters, moving through air at a standard pressure, 15 celsius, at a ...
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what would a “ceiling effect” (the converse of ground effect planes experience) entail?

Wikipedia describes ground effect as "the increased lift (force) and decreased aerodynamic drag that an aircraft's wings generate when they are close to a fixed surface." That's all fair and good, ...
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Units caculation in the article don't match for reynolds numbers higher than 1

The article discusses the forces acting on a falling object in respect to the drag forces and reynolds numbers. The article suggests for varying Reynolds numbers, the force of drag equation is written ...
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1answer
115 views

Supersonic wind tunnel with total pressure loss?

I am reading "I am reading "Fundamentals of Aerodynamics" 5th edition, J.D.Anderson. If you have the book, go to chapter 10: Compressible Flow through Nozzles, Diffusers, and Wind Tunnels". In order ...
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Moving a marble in a maze using wind force

For a school assignment, I have to write a game where you can move a ball through a maze by generating unidirectional wind when the mouse is clicked. The ball is on a flat surface. The concept is ...
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4answers
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Effect of tailwind on aircraft speed

I have been spending some time in analyzing the impact of tailwind on the ground speed of the aircraft. My analysis is based around the following equation : VAW = VAG - VWG ; where VAW is the velocity ...
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Air resistance - smooth vs pimples vs dimples

Is there any difference in behaviour between a smooth surface, surface with dimples (dips) and surface with pimples (bumps) when considering aerodynamic drag in a non-rotating frame? I have a flat ...
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Is there a conventional term for the phenomena of when fluids increase in speed after hitting the ground?

Prompted by this question here that was near the top of the recent physics questions, Does airflow also increase in velocity as it hits a surface as fluid does?, I simply wanted to ask about the term ...
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Does airflow also increase in velocity as it hits a surface as fluid does?

When you drop a stream of water to the ground, you can see it spreading out over a large area at a higher speed than it fell as the water thins out against the surface. Air is like fluid in many ways, ...
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1answer
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What is the physics behind the movement of the split-finger fastball in baseball?

A split-finger fastball, or a splitter, is a baseball pitch thrown like a fastball with an v-shaped split finger grip. When thrown correctly, it moves like a fastball, straight in the air, but ...
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How does the radius of a pipe correlate to the velocity of air at a gradient of sizes?

Suppose your pipe isn't a mere cylinder, but is more like a cone or a solid revolution of an ogive curve. It's standard that a small pipe will force air through it faster, but how do you calculate the ...
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How does the ideal polar or Cartesian equation of the profile of a streamlined body change with air velocity?

I was looking at the drag coefficients for different aerodynamic shapes and noticed a streamlined body has the lowest. Does this coefficient hold for every terrestrial velocity of air flow for that ...
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1answer
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Why papers move instantaneously upwards as they fall? [closed]

Sometime papers or leaves of trees seem to move a bit upwards as they fall. Why is that so?
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Why do most centrifugal fans found in laptops have tiny blades? [closed]

If you were to use a centrifugal axial fan instead, won't you be able to achieve higher flow rates and better pressures? It seems like the efficiency of these motors are very low.
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Can insect or bird inside bag fly away with bag around them still?

In Mythbusters it has been proven that bees cannot carry a laptop, because the downward force generated by the bees is pushing against the laptop. I have a similar question, but I am not sure about ...