Vortex Definition and 121 Threads

Hello! I have some queries regarding Vortex Lattice Method. I want to design an airfoil using Vortex Lattice Method. For that, I need to find out the equation of airfoil first. So how exactly am I going to do that? Please refer the following link...

Hi, I'm a mechatronics student and I am currently working on a project on the effectiveness of a vortex tube to cool a cabinet. The cabinet has a thermostat inside and if the temperature exceeds a threshold, an air compressor is turned on, causing the vortex tube to cool the cabinet. The cabinet...

Dark soliton is a general phynomenon in broad physics subjects. In higher dimensions, dark soliton exhibits instable except one special kind as vortex. The fundamental instability of a single dark soliton in two dimensions is to eventually decay into a number of quantized vortics through what is...

hi, What is the difference between radial polarization and optical vortex? thx http://en.wikipedia.org/wiki/Radial_polarization http://en.wikipedia.org/wiki/Optical_vortex http://en.wikipedia.org/wiki/Angular_momentum_of_light http://en.wikipedia.org/wiki/Orbital_angular_momentum_of_light...

Take a cylinder in cross flow. We know that for Reynolds number greater than 40, we will start to see vortex shedding occur. Using the Strouhal number, we can determine the frequency at which vortices will shed. Using the coefficients of drag and lift, we can determine the steady loadings on...

New photo released today from NASA showing remarkable detail of a hexagon vortex ring at Saturn's North pole. http://www.space.com/24534-saturn-hexagon-vortex-nasa-cassini-photo.html Anyone see any papers explaining how the ring gets its shape?

Suppose we have a Type II superconductor that contains a knotted Abrikosov vortex. How long can we expect this to persist? I read that the the core of the vortex is not superconducting, so energy would be dissipated. But how about the supercurrent? Once it got started, what would stop it...

Homework Statement The expression below describes a potential vortex in polar coordinates. What is the pressure p in the middle of the vortex, i.e. at radius r=0, relative to the surroundings? ##V_{\theta}=\frac{a}{r}## Answer: ##p=-∞## Does anyone have any explanation to this...

I was wondering if we decided that black holes are dense due to the spin and gravity? Are there any other factors for determining density? And could those factors also be true if a black hole were simply a vortex- like a drain per se. A drain that shoots out in two opposite directions, that...

Does anybody here have any information about gravitational vortex power plant..?

Vortex shedding is mandatory for all the bluff bodies ?? Vortex shedding is mandatory for all the bluff bodies ?? for example, flow over a low thickness flat plate with zero attach angle and flow over the very low depth dish antenna (like U shape) is there any shape (with particular...

I have observed that when water goes down the sink, a vortex forms. Why doesn't water just down, not in a vortex?

I noticed something interesting in nature yesterday. I was cleaning a sink that was full to the brim with water and once i was done cleaning my vegetables i pulled the plugged which (of course like we have all witnessed) created a vortex between the top of the waters surface and the drain. Which...

Hi, I'm looking for an aerodynamic code to model a transonic (say around M=0.8) wing for some basic structural sizing and performance estimation. I'm hoping to use the MATLAB based VLM code Tornado. It has an inbuilt Prandtl-Glauert correction option. I realize that this is technically...

In what way is compound vortex controlled combustion effective ? and does it effectively reduce emission?

I'm very interested in building this cool device, and was wondering if water could be used instead of air as the injected fluid. The main differences I notice are the much larger density, and thus possibly smaller angular velocity. And higher viscosity, which could mean a smaller radial...

Hi everyone, I am working on a project for the development of a 2D Unsteady Panel Method for Airfoils. As often already suggested in this forum I have been using the book "Low Speed Aerodynamics" which has helped me a lot to produce the Steady State solver (I am writing the code in Matlab at...

can anyone tell me how the orifice diameter can affect the vortex forming ? no much info from internet , thanks for help~:smile:

If there was any possibility of reversing the direction of wing tip vortices, what would the effects be? Is there any chance of increasing the thrust or lift? For example the right wing tip produces clockwise vortices and the left wing tip produces counter clockwise vortices(Aircraft viewed...

time for some revision... I can't find any definitive verification for this I'm trying to find the pressure field of an irrotational vortex, v_theta = 1/r, v_r = 0; I guess the pressure falls but I'm not sure how since the Bernoulli equation constant only holds over streamlines, and over...

I am trying to find a way to eliminate rust in well water. I was wondering if a water vortex could separate the rust from the water. I have a 1" diameter flow at 35 to 50 PSI. Can I place the inlet at the bottom of a larger pipe(I do not what size would be optimum) to create a vortex and have...

Hello, I'm studying superconductors and I began to wonder about Abrikosov vortices. They possesses a precise quantum flux (h/e), and are also localized in space enough to be exactly pin-pointed by experimental techniques. As it is some kind of a quantum object, shouldn't these vortex properties...

Hello Physics gurus, lately I watched a nice installation of a dancing light weight fabric. Over the ground there were placed 8 blowers in circular positioning 45 degrees each one. So I'm wondering if there was some computer controlling the intensity of all those blowers. This fabric goes up...

First post here on pf! I wanted to ask if it's feasible to determine velocities at the top / bottom surface of an airfoil due to the vortex sheet placed on the camber line (due to thin airfoil theory). I'm attempting to do this because the big picture is to determine the Cp distribution...

Refer page-24 in http://arxiv.org/abs/1010.0443v3 Eq-6.19 is supposed to be the Lagrangian of Abelian-Higgs models. Eg-6.19 is clearly a conserved current of U(1) symmetry. But I can't show how eq-6.21 is a conserved vortex current. Note: The last term in the Lagrangian is not the usual F_{\mu...

Please Help! In dealing with wind induced forces, caused by vortex shedding action over a circular cylinder, we must calculate the parameter "Kw" (effective correlation factor), which depends on "L/b", "L" beeing the "correlation lenght" (Eurocode). Is there any method, analytical (or...

Hi Physics Guys, I'm not a physics guy myself but some google searching lead me to this site so I signed up so I could ask a question. I'm into amateur motor sport and I'm currently driving a 1999 Subaru WRX. Anyway I'm always looking out for anything that will increase it's performance...

Alright guys here is the deal, i have had a vortex cooling system on my mind for a while and started wondering could it be made larger, with more air flowing through it, but with less PSI and still cool at least somewhat? i was thinking of making a larger one and attaching it to a high...

Anyone has ever came across this powerplant? I'm a final year mechanical student, and i was asked to design the turbine blade to harness tp obtain the maximum efficiency of the hydro vortex. I'll be glad if someone can help me out by giving me some vortex calculations,simulations or any related...

Homework Statement I must determine whether the following vector fields have sources or vortices. 1)\vec A = (\vec x )\frac{\vec a \times \vec x}{r^3} where \vec a is constant and r=||\vec x||. 2)\vec B (\vec x )= \frac{\vec a}{r+ \beta} where \vec a and r are the same as part 1) and \beta >0...

Physics: Vortex air ring shooter? Using air only & a PUSH or a PULL with a 32 GALLON bin how do i make a vortex ring that travels Furthest? - Whats better than a regular plastic trash Bag? - Use a bungee cord? - How big does the hole in the 32 Gallon Bin have to be in order to shoot...

Can someone help me with this, I need to prove that a flat vortex sheet of strength \gamma(s) at an angle of attack \alpha with the horizontal and has a p_{2} - p_{1} = \rho V_{\infty} \gamma cos(\alpha) I just need to mathematically manipulate 2 formulas, namely the following two...

QUESTION 1 Earth's atmosphere is a forced vortex? I guess yes, because an airplane moving to the west does not confront different air resistance than one moving to the east. Correct me if wrong, because I have some doubts: Up to what height? Even the exosphere? QUESTION 2 Suppose you create...

The fluid or air speed increases as we are approaching the centre of the vortex. But how much? What's the equation giving the speed f(R) of the fluid at each radius R?

Hello. I am working on a project that requires me to make air move in a vortex. From research, it appears that one of the most common ways of doing this is to rotate a cylindrical screen, which imparts curl to the airflow and thus creates a vortex coaxial and concentric to the center of the...

With given object dimensions and speed moving inside a fluid. How do i decide if vortex shedding will occur? It is sometimes obvious just to look at the speed and dimension and say it will not occur as its going too slow or vice versa. Is there formula or some mathematical criterion to...

i know vortex tube is an element used to cool the air by changing pressure i d like to know how does it work exactly ??

Is there a pressure wave in every vortex (or cyclone etc), created by the motions of the molecules of the fluid or air which make up the vortex, pressing towards the centre of the vortex, and causing the ... buoyancy-like result that: The solids are moving towards the centre of the vortex...

I was reading about http://en.wikipedia.org/wiki/Aeolian_harp" . It is explained that "the harp is driven by von Karman vortex street effect" So I read about http://en.wikipedia.org/wiki/Von_Karman_vortex_street" . I also read a few other sources on von Karman vortex street effect. It is...

So, let's say I have a bluff body in a moderate-speed wind environment, as in wind across the deck of a bridge. As the vortices form across its surface, do they apply alternating force to the structure? (Maybe I'm completely misunderstanding the nature of vortices)...

I am doing a paper regarding active techniques to control/manipulate vortex shedding in the near wake behind a 2D or axisymmetric bluff body, such as cylinder. May I know what are the available active techniques used in controlling vortex shedding? Thank you.

1. Can anyone please explain in detail How a Vortex if formed. I mean what are the reasons and physical phenomena that cause the water entering a bath tub sink to gain a CIRCULAR ROTATIONAL motion and form a Vortex. How do the water molecules otherwise traveling straight towards the sink...

If I am using vortex generators in an attempt to delay diffuser separation what would the consequence be of the vortex generators stalling? For instance if I set them at and angle of attack to the flow that was past the stall point.

I am wondering if I can use a shop air compressor (120psi) to achieve sonic flow? I am building a vortex tube (for spot cooling) and need a high velocity jet to form the vortex. What is the minimum pressure diff. required to achieve sonic flow of compressed air? Does varying the diameter of the...

http://www.thestar.com/article/238291 Out of curiosity, in this article it says that a generator can produce on average 200 megawatts, just enough to power a small city. Does anyone know if they meant for a year or for a day?

vortex in superfluidity is well known in a continuum system, a vortex is well defined along a closed (continuous) path, the phase change is well defined. However, on a lattice, i don't think the phase change from site to site can be well defined. but people are talking about vortex...

Hi, I know this sounds crazy but I just found this really interesting idea at wwww.amasci.com. It's basicly a plan for a hovering heavier then air blimp, which can travel faster then the speed of sound, without making a sonic boom. It sounds like a UFO and I just want to know if its...

Vortex tubes have always puzzled me. They are very popular in industrial applications, their performance can be modeled to an extent, but no one knows for certain how they work. Wikipedia states "Pressurized gas is injected tangentially" but I have found this is not always the case which leads...

Kind aerospace folk, Preamble: I'm trying to write my own aerofoil vortex panel method, but have run into some difficulties. The method is designed to work in Excel, so is limited in matrix size for reliable inversion (for vortex / velocity matrix). This means that the traditional method...

Can someone please explain to me the concept of vortex breakdown?