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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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25 views

How to write Navier stokes equation in 2D along a stream line path?

How to write navior stokes equation in terms of instantaneous tangent t and normal n at a point on a streamline. ?.
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What is the drag coefficient of a tetrahedron? [on hold]

I would like to know the drag coefficients of all of the Platonic Solids. However, I am more interested in that of the tetrahedron.
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Do air-crafts fall when exposed to nuclear radiation? [on hold]

I don't have a background in physics. However I wanted to ask a question relevant to the Chernobyl disaster. From what I found online the helicopter that tried to release sand to shut down the fire ...
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I want to learn the behavior of rotating bodies thrown in the air [on hold]

Could anyone suggest me a paper that could help me on that? ( That describes it mathematically. )
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Physics of air flow in Kipchoge's sub-2:00 marathon

Yesterday Eliud Kipchoge became the first human to run a marathon distance in under two hours. Part of what allowed him to do it seems to have been that he had pacers running along with him to break ...
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Why is the body of the rocket so long and does it effect the flight?

so my qustion is that why are rockets body so fricken long it is crazy all the rockets body are so very long and I need an answer to the question please tell me it is for science and i really need ...
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Drag coefficient for the fin of a model rocket

I am working on a 1D model rocketry simulator that accounts for drag. I have been looking online, but unable to find the typical drag coefficient for a fin. Would anybody happen to know what it is?
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Dominant component of drag in a streamlined body (sounding rocket) at 0.8 Mach

We are currently working on CFD solutions on ANSYS Fluent for the drag on our sounding rocket. We are modeling its drag profile through out its velocity range. We currently hit a top speed of approx ...
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1answer
41 views

What parameters affect the range and flight path of playing card? How?

An ordinary playing card can fly quite a long distance if you spin it during a throw. What parameters affect the range and flight path? How?
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Why does a spinning disc turn before it fades?

I have recently gotten into disc golf, and an interesting phenomenon happens when you throw a disc hard. If you throw a disc right hand back hand, so that the disc spins clockwise, at high velocities ...
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1answer
37 views

Is it possible to calculate the skin temperature of an object passing through a gas?

If you have an object passing through a gas at a certain velocity, is it then possible to calculate the temperature of that object using properties like velocity, density, mass and/or others?
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4answers
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(Lifting of aircraft wings) Source of centripetal force on a curved streamline?

I am trying to understand how wings lifting work in airplanes. One explanation is found here Basically a fluid portion on curved streamline will experience a centripetal force. This centripetal ...
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4answers
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Why doesn't my flight aerodynamics maths work? [closed]

Context: For some context, I'm a game developer and I'm building a flight sim game. My goal is to have realistic flight physics -- not arcade physics. I'm having issues with the maths -- it is not ...
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Drag force on the thin string loop rotating in air

I'm trying to figure out what is the drag force per unit of length on the circular string loop rotating in air around its symmetry axis. In particular I'm interested how this force depends on the ...
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1answer
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Is it possible to use cratering processes to measure the yield strength $Y$ of a material?

I have some questions about the paper The scaling of impact processes in planetary sciences. K.A. Holsapple, Annu. Rev. Earth Planet. Sci. 21, 333 (1993); available as an author eprint on ...
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Do flat plates result in less drag than concave surfaces? [duplicate]

Do flat plates (A) result in less drag than concave surfaces (B)? Intuitively, i think flat plates produces less drag than concave surface because the concave surface makes the fluid move backwards, ...
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Is there a Coandă effect outside the atmosphere?

For example, when air is blown through a spoon in the atmosphere, the air flow bends toward the spoon. People say it's the Coandă effect. So, outside the atmosphere, when we let air blow through the ...
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2answers
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Resolve Drag into Vector Components

Assume you have a sphere travelling at a velocity of $30$m/s, at angle $30^\circ$ relative to the local horizontal plane. For the purposes of the below equations please ignore more complicated ...
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1answer
65 views

How much kinetic energy does a helicopter use in a hover? [duplicate]

A helicopter just circulates air in a hover and maintains a stable altitude. So, how much energy is used to do this? Using the standard equation $KE = \frac12 mv^2$; then the kinetic energy used would ...
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3answers
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Are optimal turbine blades also optimal fan blades?

In one case, the air drives the blade, in the other the blade drives the air. Since each is 'just' the reverse of the other, one might expect that the aerodynamics are the same, with other variables ...
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Center of lift in an aircraft

what is center of lift in an aircraft? How is it different from aerodynamic center and center of pressure? Why is COL important?
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Why does stagnation/total pressure and temperature remain constant throughout isentropic expansion waves?

I know $\frac{T_o}{T}=1+\frac{\gamma-1}{2}M^2$, $\frac{P_o}{P}=\Bigg(1+\frac{\gamma-1}{2}M^2\Bigg)^\frac{\gamma}{\gamma-1}$ and $\frac{P_2}{P_1}=\Bigg(\frac{T_2}{T_1}\Bigg)^\frac{\gamma}{\gamma-1}$. I ...
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Generating lift by Naruto running

"Naruto running" is running with your arms behind you (pictured above). Many characters in the Naruto series are superhuman and can run way faster than a normal human. I thought that they run like ...
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Calculate work done by a hovering helicopter over time

This is likely to be very simple, but... How does one calculate work done by a hovering unmoving aircraft over time? As in work in Joules. In this scenario, to remain hovering the aircraft has to ...
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Most effecient negative shape to create laminar flow

I was looking at laminar flow filters to aid in my mycology work I'm doing. Most filters use an aluminum extrusion with fins. I figured the options out there are pretty expensive for what you get and ...
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Flight time of spherical bullet fired horizontally versus dropped vertically / effect of crosswind on spherical car

Would a spherical bullet fired horizontally from a musket stay aloft longer than a spherical bullet dropped from the same height? I know two similar questions have been asked (Will a bullet dropped ...
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Car Max Range Equation

In space engineering, thanks to the rocket equation, if you know some properties about a rocket (payload, fuel mass and specific impulse) you can compute the theoretical maximum distance the rocket ...
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1answer
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Which control volume is being used? [closed]

Consider the control volume shown in this question To evaluate the lift, the integral form of the conservation of momentum was applied as shown in this solution video (Skip to 2:07 for evaluation ...
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1answer
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Drawbacks of a Tip jet helicopter [closed]

A Tip Jet helicopter offers some advantages, i.e. eliminates transmission, torque is lower, etc. Engineers experimented with this design in 1950s, but remains marginal at best. What are the ...
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2answers
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What is irrotational flow? How to judge?

For example, when the wing moves horizontally, the direction of fluid flow changes first to upward at the leading edge of the wing and then to downward at the trailing edge. Does it rotate? If the ...
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3answers
107 views

Do drones fly because of low pressure above them or high pressure below them?

I was working on some drone battery life solutions and was stuck with the question whether drones fly because of low pressure created above them by the rotor or due to high pressure created below them....
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Why an aircraft or a ship produce pressure waves both in front and behind them?

I think it is obvious why a pressure wave is produced in front of a moving object but why the rear of it should produce a wave?
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How to determine angle at which altitude gain is 0 on (for example) a quadcopter?

Let's say I have a quadcopter and, speaking in terms of thrust-to-weight ratio(and any other necessary components) how can I determine the angle at which I can position it where it will neither gain ...
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1answer
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Why do planes use 1-2 propellers in the front, but drones have 4 on top? [closed]

Planes with propellers normally have one or two propellers in front, facing forward, helicopters have one on top facing up and one facing the side, and drones have four on top facing up. How do the ...
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Angle of attack and lift: is there a model?

The relation between the angle of attack $\alpha$ of an airplane's wing and the lift $F$ generated by it is quite complex. If I treat air particles as tennis balls hitting the wing at the front, then ...
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1answer
40 views

Tone production in Irish Flutes?

Since it's about a technical issue, I thought that this question would fit in here the best (as opposed to the music.stackexchange-site): I'd like to know how tone-production in an irish (wooden) ...
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Aerodynamics of a bed sheet

Given the mass of a bed sheet and its area, is there any way of determining the probability of it landing "perfectly" when it is jerked up on the bed (by jerk i mean when you are making your bed and ...
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What is the lift coefficient of human body?

Assuming we can change angle of attack by changing our hands orientation what is the maximum aerodynamic lift coefficient of human body?
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2answers
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Is it possible to substitute wind speed for the speed of an aircraft in the lift equation $L = \frac12 dv^2sCL$

As in, how would you calculate the amount of lift an aircraft experiences, if for example the plane itself was stationary in a wind tunnel but is subject to high wind speeds and as a result ...
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70 views

Does the ideal gas law apply to a moving vehicle?

If for example you have a car travelling along a road. There is obviously a high pressure region in front of the car, where the air is forced around the vehicle. Likewise, I understand that cars will ...
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Do planes have to be noisy?

I tend to think of noise as an undesirable waste of energy because the generator was not designed for that purpose. But that doesnt mean this waste can be avoided. So I wonder how much of this noise ...
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2answers
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How do you find the minimum height to open a parachute for a safe landing?

What concepts/formulas can be used to find the optimum/minimum release height of a parachute?
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4answers
109 views

Please explain airflows above and below aerofoils for a layman

I have read about the lift of airfoils a lot recently and just want a few things cleared up. When incoming airflow hits a typical cambered airfoil and diverges into “top” and “bottom” air flows, why ...
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Drag Coefficient of a rounded nose cylinders

According to this page The drag coefficient of a rounded cylindrical bodies is given by this graph Then the drag coefficient of a cone for a half vertex angle ε is given by this graph. How can ...
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138 views

How to find drag of a cylinder?

How can I find a drag on the cylinder placed in uniform water flow, if I know a velocity field around it?
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Does cross-sectional area affect the air time of a vertically thrown object?

Factoring in air resistance, I have two objects A and B of identical mass, however have different cross-sectional areas. A has a larger cross-sectional area than B. If I throw both objects directly ...
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2answers
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Sound boom the other way around?

We know the sound boom - but is there any effect if a body decreases the speed underneath the sound barrier?
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1answer
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Model Rocket Stabilisation

I am designing a model rocket and am using 3 B6-4 Engines. Inevitably there will be perturbation of its trajectory by wind and engine/thrust inconsistencies. The way that I currently understand the ...
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Force applied by horizontal wind on object

Hello, I have a question for a project I'm currently doing: In a tunnel with no gravity, there is a constant wind blowing through. A sphere in the middle of the tunnel is completely motionless to ...
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How do floating wind turbines stay upright?

Some designs for floating offshore wind turbines have asymmetric bases. Why, however, is the turbine sometimes based on the downwind side of the float as seen here and here? And, related, what ...