Questions tagged [aerodynamics]

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I have a problem with my representation of roll in Simulink

I am currently an engineering student and a member of the aerospace club of my engineering school (ESILV) which is called LéoFly. We’re a team of 12 students and are building a Fusex (...
Axel JOLY's user avatar
3 votes
0 answers
63 views

How does NASA's QueSST X-59 jet work?

The QueSST (Quiet Supersonic Transport) is a project to create a more diffuse sonic boom in order to use supersonic flight commercially without the usual abrupt 1~2 psf pressure spike damaging the ...
KryptofTen's user avatar
3 votes
0 answers
129 views

Mathematical transformation of a heading angle to a roll angle

I'm trying to understand a function in a SIMULINK example of a path following UAV simulation. The gist is that, the UAV Waypoint Follower block provides a required heading from a list of waypoints and ...
Chryron's user avatar
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2 votes
0 answers
112 views

Convergence problem in RANS simulation of unsteady flow

I am simulating an air flow through a two dimensional rectangular channel. The channel splits into two channels, one of them is followed by a 90 degree bend downwards and leads into a cylindrical ...
Simon Henn's user avatar
2 votes
1 answer
183 views

In horizontal axis wind turbines, why does axial component of absolute velocity stay constant (wake rotation theory)

I am having hard time understanding how does the axial component stay constant through the rotor. Every resource i look just says it is due to mass conservation but never gives the actual conservation ...
redginer's user avatar
2 votes
0 answers
1k views

Formula for "ram rise" that works all the way to orbit

True Airspeed (TAS) is the vehicle speed relative to the surrounding air. My assumption is that if I am in orbit say at 120 km altitude with an instantaneous velocity of 8 km/s my TAS would be fairly ...
Jason Reskin's user avatar
2 votes
0 answers
63 views

A Question of Coaxial Rotors and Lift

I'm only a HS physics student, so please bear with my lack of jargon. My question goes like this: In the scenario of two coaxial rotors spinning independently in two different directions, each with ...
Lowlight's user avatar
2 votes
0 answers
43 views

what is the actual meaning, role and aim of $p_0$, $V_{a_0}$ and $V_c$ for Mach-meter?

Roskam, book "Airplane Aerodynamichs and Performance" at subparagraph: "2.5.2 HIGH-SPEED AIRSPEED INDICATORS (COMPRESSIBLE FLOW)" uses the following three equations: a) $\left(\frac{\gamma}{\gamma-1}\...
p.pensopositivo's user avatar
1 vote
1 answer
38 views

Why do wing-tip vortices cause an induced angle of attack upstream?

My question is the following. Wing-tip vortices induce a downward flow on the root side of the wing. So, if this induction happens at the wing, and these vortices are then shed downstream, why is ...
Armaan Mohammed's user avatar
1 vote
1 answer
42 views

How will the motion of air be just before the isolation damper?

Let's say I have duct work shown as below. I have air moving from left to right with high velocity.There are two elbows and there is a damper of the same kind just before each of them and there is ...
MrsDalloway's user avatar
1 vote
1 answer
343 views

What are the advantages of an asymmetrical missile nose cone?

Some rocket- and missile designs sport an asymmetrically conical nose cone. A prime example being the Stunner missile in "David's Sling" surface-to-air system. Several sources (such as ...
Elmore's user avatar
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1 vote
1 answer
66 views

What is the side way force on a flat membrane place perpendicular to the flow of current on one side, and stagnant water on the other

So basically imagine a plate being placed parallel to the direction of flow of water with water flowing with a certain velocity on one side of the plate and on the other side it is almost stagnant. ...
Uttarayana's user avatar
1 vote
0 answers
118 views

How to properly use the lift-curve slope for divergence calculations?

I was reading Wright and Cooper's writings on static aeroelasticity and I think I'm missing something. To calculate the acting lift, the equation $L = q S a_1 \theta_0$ is used, where $q$ is the ...
Sopmach's user avatar
  • 11
1 vote
0 answers
91 views

Which of these propeller configurations is most efficient?

All propellers shown in the figure above are identical and are operated at identical speeds with four separate (numbered 1 through 4 vertically) configurations illustrated. The physical distance ...
kbakshi314's user avatar
1 vote
0 answers
50 views

Superimposing a Vector Field onto a Toroid in Matlab

I am a systems and control PhD student in Aerospace Engineering. Currently, I am trying to create a wind shear model of a toroidal thermal "bubble" in Matlab similar to the one in this paper (shown ...
Carleen 's user avatar
1 vote
1 answer
75 views

Normal Shockwaves occurrence at cone tip with Angle Theta

I have a question regarding shockwaves. So as far as my knowledge, a flow moving at Ma= 1 will create a normal shockwave ($arcsin(1/Ma)$) , and a flow moving faster will cause an oblique shockwave. So ...
QUTADAH's user avatar
  • 19
1 vote
0 answers
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Skelet Theorie, can anyone help?

I am studying Gas dynamics and came across the lift angle approximation as based on Skelett Theorie (in german). I have done google searches on finding this theory but no luck on any information. Can ...
QUTADAH's user avatar
  • 19
1 vote
1 answer
126 views

Torque induced regular precession/ nutation calculation and visualization out of attitude Data

I have a rocket body with given Euler Angles, Quaternions and Angular-Velocities for given time steps. And I'd like to calculate the regular precession and nutation for every time step, so that I can ...
Wiesel's user avatar
  • 11
1 vote
1 answer
393 views

Calculating mass flow rate of a scramjet engine?

First post here. I'm an undergraduate ME interested in fluid mechanics. I came across scramjets and I was interested about the engine. I want to calculate the mass flow rate of the engine and I made ...
GreenFlux's user avatar
1 vote
0 answers
27 views

How to evaluate the fuel consumption rate of an air conditioner in a vehicle?

Using two cases studies: I. When the windows are wound up and air conditioner is turned on. II. When the windows are wound down and air conditioner is turned off. Case studies are evaluated for ...
Manuel Charles's user avatar
1 vote
0 answers
49 views

What is the theoretical relationship between sound and mass with respect to the sound barrier as a max velocity?

First post here, forgive me any faux-pas. In regards to compressible flow and accelerating a mass flow, such as in a converging nozzle, I know that you can't accelerate a mass past the speed of sound (...
llama's user avatar
  • 11
1 vote
0 answers
44 views

Determination of a Joukowski airfoil chord (demonstration)

I'm currently studying Aerodynamics, and one thing that I noticed is that the maximum and minimum $x$ coordinate of the airfoils (which are necessary to compute the chord) on the transformed plane (...
Élio Pereira's user avatar
0 votes
1 answer
17 views

How could I calculate the torque due to lift and drag in the body frame?

I'm trying to figure out the torque due to aerodynamic forces on an aircraft confined to two dimensions (so no sideslip). Defining the windframe with basis vectors $\hat{w_1}, \hat{w_2}$ obtained by ...
Merkel_Bot's user avatar
0 votes
0 answers
39 views

How does a filter mesh/scotch-brite increase the thickness of the foam in foam spray?

On YouTube there are a lot of videos that show how to make a foam spray from a simple garden spray. One example you may see here: https://www.youtube.com/watch?v=kKUX5H7-xu0 (5:55 point is the most ...
user45323's user avatar
0 votes
0 answers
29 views

Aerodynamic design and characteristic of fan vs blower

I just learnt about the difference between a fan and a blower, namely the former providing high flow rate at very low outlet pressure (<1.1*inlet) and the latter providing a slightly increased ...
temporary_pigeon's user avatar
0 votes
1 answer
52 views

Why does CFD over predict shockwave in comparison to wind tunnel?

I ran a CFD simulation of Mach=0.85 flow over an aerofoil and noted that my Cp (coefficient of pressure) plot over predicts the shockwave in comparison to experimental data? Can someone please explain ...
Lerman's user avatar
  • 1
0 votes
1 answer
64 views

How does a fighter craft rebalance itself after it fires its munitions and missiles?

How does a fighter craft rebalance itself after it fires its missiles? Each missile could range anywhere from 40kgs up to 750kgs depending on the model. I am curious to know how a fighter craft ...
Rohit Samant's user avatar
0 votes
0 answers
100 views

Unable to validate hypersonic flatplate case in DSMC SPARTA

I'm trying to learn a software called DSMC SPARTA. I'm validating the hypersonic flatplate case mentioned in one of the tutorials on the website (Page 17). This was my test case: ...
Aditya Jain's user avatar
0 votes
2 answers
216 views

How to theoretically determine the flow rate for a fan design?

I am trying to design a ducted axial fan. The fan will be pulling air through a filter, and ejecting out into the atmosphere (For a CO2 direct air capture application). However I want to start with ...
Prismatic_compass's user avatar
0 votes
0 answers
80 views

Density or Pressure based solver CFD

I’m currently trying to simulate the 2d cross section of a bullet using Ansys Fluent but am really confused about which solver type to use- density or pressure based? Conditions: Transonic (M=0.8) ...
Eddie's user avatar
  • 1
0 votes
0 answers
34 views

Pitot and static port placement - How to choose the ideal location

Forgive the this topic placement as it might be similar to other older ones (Although I a bit sure that the main contents might be different than other older ones). In the upcoming days I will have a ...
Theodosis Koutsoukos's user avatar
0 votes
0 answers
19 views

How Does The Aerodynamics Of This Hanging Rotating Wing VAWT Turbine Function?

We are examining videos of this very fast rotating "hanging VAWT" shown on Youtube: https://youtu.be/O2MZsK0mvBk https://youtu.be/7hVQ_rVNRUI It say in the text description that "...
Ahmad Al-Masri's user avatar
0 votes
0 answers
35 views

how to calculate drag force (to be used later in the calculation of drag coefficient)

I'm working on a school project for car design (M segment car) we already found an open source Toyota model and can get the final answer online, but I want to know how can I calculate them what's on ...
Abdelrahman Sherif's user avatar
0 votes
2 answers
324 views

How to calculate missile's radius of turn?

I want to make a simple simulator game and in this game there is a missile that must hit something. The problem is, I can't find the equation to calculate its radius of turn. The game is a simulator ...
Curious guy's user avatar
0 votes
1 answer
64 views

Scroll design for off the shelf tangential/cross flow fan rotor

I'm trying to figure out a somewhat optimized fan scroll shape for a cross flow fan rotor I aquired. However I seem to have vastly underestimated the complexity as I have a lot of trouble finding ...
tstdr's user avatar
  • 1
0 votes
1 answer
120 views

Wind drag by a solar panel on an RV trailer

I installed my solar panel a couple weeks ago and now I'm not sure if I did it right. The first pic is mine the second is the other guy. it’s what brought up the curiosity, as this guy has the same ...
rasmukri's user avatar
  • 101
0 votes
0 answers
64 views

is there a difference in performance between these two fan designs

These two fans are usually used in hairdryer is there a difference between them in performance if both have same rpm and same outer diameter.
Abdulwali's user avatar
0 votes
0 answers
46 views

Vortex diameter

There exists clear definitions of the size of a vortex core, but vortices affects it surroundings beyond this core. An example is a wing tip vortex which has a small core, but can be seen as a big ...
Simon's user avatar
  • 1
0 votes
0 answers
65 views

How to determine the stability of an aerodynamic shape in ANSYS Fluent

I have the aerodynamic outer mold line file of a drone. The first task of the school project is to verify that the drone is stable. First, I used the 2021R2 version of ANSYS Fluent to try to find the ...
Faito Dayo's user avatar
0 votes
0 answers
35 views

Are there any methods to figure out how aerodynamic a race car is without a Cd number?

For the top speed of a car, I believe it's usually limited by drag and horsepower. However, I've also learned that gearing can affect the top speed and acceleration of a car. Are there any methods to ...
user34971's user avatar
0 votes
0 answers
25 views

What is the velocity of a fluid particle at the center of a infinitely long counter-rotating vortex pair?

Let's take circulation strength of each vortex τ and distance between them is r. I feel the answer should be 2τ/πr but my friend is arguing its τ/2πr. So my thought process goes like, if you have a ...
Chetan Gowda's user avatar
0 votes
0 answers
38 views

Wind behavior and pattern

From the 5 options, which one shows the worse wind effect? Is it (b) because wind speeds accelerate through a gap? But how about in comparison to (c)? Or (d) due to the height and sharp corners? If it'...
SSan's user avatar
  • 111
0 votes
0 answers
45 views

Why does the tapered part of a Wing have such high coefficient of Lift?

If we take a Trapezoid wing shape as an example and see that it has low $c_l$ near the root of the wing and very high $c_l$ at the tip. The Lift generated, however, is reversed to the that of the $c_l$...
Sherlock Homies's user avatar
0 votes
1 answer
97 views

How to do Blade Element Momentum Theory Analysis for NACA airfoils?

I wanna perform BEMT analysis on blades of different geometry and not just symmetric thin airfoil. How to do this?
Adithya NYY's user avatar
0 votes
0 answers
97 views

Determining thrust equations for a custom UAV

I have been tasked to mathematically model and simulate a 2 propeller, 2 motor UAV. But I am struggling with determining the thrust equations, of the propeller, for my design. I know that: Ft = Ct * ...
gunter's user avatar
  • 321
-1 votes
1 answer
53 views

Efficiency of propeller with Wind perpendicular to rotation axis

What happens to air flow and propeller efficiency if it is moving with Wind perpendicular to rotation axis. The air is blowing in a direction lying on the Planet of the tips.
CoffeDeveloper's user avatar
-1 votes
1 answer
87 views

What determines if a shockwave is normal or oblique

So I am studying Gas dynamics and I know the math regarding Normal and Oblique shockwaves, but I am not sure why would one occur and not the other. Is there a rule when normal shocks will occur or ...
QUTADAH's user avatar
  • 19
-1 votes
1 answer
58 views

Achieving dynamic similitude by sacrificing geometric similitude?

The goal is to scale up a general aviation aircraft by 15%. Dynamic similitude is the primary goal. I have reviewed research on scaling aircraft models but it seems most of it is focused on creating ...
MedicalFlyer's user avatar
-1 votes
1 answer
71 views

What is the most efficient way to heat air?

I'm currently playing with a school project. My goal here is to heat a stream of air to a significant temperature so I can demonstrate air expansion. I have a cylinder, with a few turbines, turning in ...
Max's user avatar
  • 1
-2 votes
1 answer
66 views

Why wind turbine with more blades rotate slower compare to one or two blades?

Why wind turbine with more blades rotate slower(lower RPM) than turbine with just one or two blades, if both has equal diameter on same wind speed? Often people say more blades have more drag, but ...
user707264's user avatar