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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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How to calculate mass of a gas mixture knowing its volume, molar mass and pressure? [on hold]

I have a gas mixture of volume $V$, molar mass $m$, pressure $P$. I need to calculate its mass $M$, but all formulas I found get in the loop as pressure formula requires density, which then ...
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Insert sensors in an aerostat with helium?

Hy is possible for you insert sensors (to calculate pressure and temperature) inside an aerostat with helium ? I ask this because... I have an helium balloon anchored to the ground by a rope with a ...
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46 views

Does the supersonic aircraft feels less air resistance than when it flies with velocity less than sound

When ever I see pictures like this of some object flying at speed greater than sound , I see triangular waves . So I got question in my mind that Do supersonic objects weather its bullet or aircraft ...
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Aerodynamic Force Decomposition

We know that aerodynamic drag is proportional to the square of the velocity of the incoming flow: $$D=kV^2.$$ If I decompose velocity into arbitrary orthogonal $x$-$y$ directions:$$V_x=V\cos\theta\\...
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33 views

Does the weight on a car's wheels decrease with increasing speeds? [duplicate]

Ignoring the reduction in fuel weight as it burns, does the weight on a car's wheels decrease with increasing speeds? If so, by how much and is there a fomula for calculating that? At what speeds ...
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31 views

Why wasn't the Stipa-Caproni plane efficient in its flight?

The Stipa-Caproni was an experimental italian plane design. Though it has a very peculiar shape, it seems at first glance like it would have pretty good aerodynamic profile since its reference area ...
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2answers
32 views

How much aerodynamic heating could we make without leaving the atmosphere? [closed]

When an object goes beyond the speed of sound in air, it will heat up due to the air in front of the object compressing. This can be seen for example during supersonic flights and during atmospheric ...
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24 views

Inverted flight [duplicate]

I've read the answers provided but I'm still confused that if an aerofoil is designed so that air flows faster over the upper surface for the purpose of providing lower pressure and hence lift why in ...
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12 views

Does bernoulli's principle explain the suction by an emerging air stream?

Consider flow exiting a nozzle into atmosphere, its static pressure will decrease through the nozzle as the molecules vectors align with the direction of the exit. However, as soon as it exits the ...
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32 views

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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22 views

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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15 views

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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3answers
113 views

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
107 views

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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1answer
19 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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2answers
50 views

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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1answer
70 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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3answers
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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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1answer
37 views

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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35 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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3answers
43 views

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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41 views

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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76 views

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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2answers
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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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27 views

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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36 views

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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116 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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1answer
75 views

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
26 views

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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1answer
71 views

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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1answer
34 views

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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60 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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59 views

Density of ionised air

Is ionised air less dense than ordinary air, if so, by how much?
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1answer
60 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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157 views

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
114 views

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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69 views

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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52 views

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
155 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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2answers
70 views

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
102 views

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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23 views

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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35 views

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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132 views

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 ...