What is Vortex: Definition and 138 Discussions

The Verification of the Origins of Rotation in Tornadoes Experiment or VORTEX are field experiments that study tornadoes. VORTEX1 was the first time scientists completely researched the entire evolution of a tornado with an array of instrumentation, enabling a greater understanding of the processes involved with tornadogenesis. A violent tornado near Union City, Oklahoma was documented in its entirety by chasers of the Tornado Intercept Project (TIP) in 1973 and visual observations led to advancement in understanding of tornado structure and life cycles. VORTEX2 utilized enhanced technology allowing scientists to improve forecasting capabilities to improve advanced warnings to residents. VORTEX2 sought to elucidate how tornadoes form, how long they last and why they last that long, and what causes them to dissipate.VORTEX1 and VORTEX2 involved large surface fleets of instrumented vehicles as well as aircraft and mobile radars. Important work on developing and coordinating mobile mesonets came from the field projects, and analysis of data collected in subsequent years led to significant advancement in understanding of supercell and tornado morphology and dynamics. The field research phase of the VORTEX2 project concluded on July 6, 2010.

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  1. N

    Understanding Kármán Vortex Street Effect

    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...
  2. Gordy

    Will Vortices Cause Alternating Force on a Bridge in Wind Tunnel Testing?

    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)...
  3. G

    Active techniques to control vortex shedding

    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.
  4. M

    Vortex lattice method - advise?

    Hey I think I posted this first in the wrong thread so i hope this is right now :) I'm in my final year of Aerospace Engineering student and I've recently been trying to develop some work where i want to measure the roll rate plus some other aerodynamic characteristics of a jet aircraft in...
  5. M

    Vortex Lattice Method - can anyone help?

    Hey all, I'm in my final year of Aerospace Engineering student and I've recently been trying to develop some work where i want to measure the roll rate plus some other aerodynamic characteristics of a jet aircraft in both its standard configeration and with a basic morphing wing. I initially...
  6. R

    Formation of Vortices: Reasons & Physical Phenomena

    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...
  7. J

    Consequences of Stalled Vortex Generators on Diffuser Separation

    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.
  8. J

    Achieving Sonic Flow with Shop Compressors and Vortex Tubes

    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...
  9. S

    Can the Atmosphere Vortex Engine Generate Enough Power to Sustain a Small City?

    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?
  10. W

    How can one define vortex on a lattice

    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...
  11. R

    Is a high-speed vortex blimp possible?

    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...
  12. Topher925

    Vortex tubes, how do they work?

    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...
  13. G

    Vortex Panel Method Development Question

    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...
  14. S

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

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

    Understanding the Difference Between Vortex and Eddies

    Hi, I have a small confusion regarding using the terms "vortex and eddy". My doubt is 'what is vortex and eddy?' 'where are this terms appropriate to be used?' 'what is the difference between them?' may be this is silly question but if anyone can help I would thanks him in advance.
  16. S

    Understanding Vorticity and Propagation of Ring Vortex

    my question relates to the axisymmetrical ring vortex. i know that vorticity must remain constant within a tube, (helmholtz vortex theorem 2) so does that mean that the vortex lines on the outside of the ring are longer (spinning faster) than the ones on the inside? also is that what makes...
  17. N

    Vortex tube: effect of cooling

    To anyone familiar with the Ranque-Hilsch vortex tube: Say if the cooled air is allowed to pass over the vortex section of this tube, what would happen? Would the effect of cooling be the destruction of the vortex? or would it act to further decrease the temperature of the cold exhaust?
  18. B

    Benefit of a Vortex Generator in a turbocharged automotive applications

    Benefit of a "Vortex Generator" in a turbocharged automotive applications As the title states, What is, if any, benefit of creating a vortex in the air flow prior to it entering the turbocharger. Here is a photo of the "Vortex Generator" in question...
  19. L

    Help Needed: Solving the Equation for a Vortex Shape

    I hope someone can help with this - its been driving me mad for a while now! You will have noticed the shape coffee (or whatever liquid) takes when you stir it. Clearly a vortex getting deeper and steeper the faster it is stirred. So - here's my problem. What's the equation that defines...
  20. R

    Rotary air compressor and vortex tubes questions?

    Hello, below are some specs I was provided of a micro screw air compressor, its physical dimensions are 4x4x4 and it seems pretty impressive for its size. However I am trying to understand a few things about the data that was provided. I am provided 6 charts on power/airflow/psi etc, each...
  21. V

    Exploring the Vortex Flow: Properties, Generation & Behaviour

    Hi please explain the vortex flow the vortex flow properties the vortex flow Generation the vortex flow behaviour Ryan
  22. P

    How to Calculate Surface Elevation in a Vortex?

    Is there a way to calculate the rise in surface elevation of water in a vortex from the middle to the outside?
  23. 6

    Position of line vortex from Stream function

    Homework Statement So, the problem is 4 line vortices in a 2-d square. All have the same strength. I am asked to find the motion of the vortices in the flow of the others. Meaning, each vortex moves in the flow of the other three. I know the correct solution should be just a circular...
  24. P

    Vortex tube application question

    I recently invented a new application for vortex tube. The application requires a very minimal flow of air at freezing temperature. I wonder if it's possible to design a vortex tube at a very small size if only a very tiny air flow is required? Is flow rate proportional to physical size...
  25. P

    Vortex Doubt: Get Hints & Answers!

    Hey folks... I am goin nuts with this vortex thing. please somebody help me pleasezzzzzzzzzzzzzz my doubts 1.whats bound vortex? 2.Whats horse shoe vortex? 3.Whats free and forced vortex? 4.Whats vortex tube? 5.Whats vortex filament? please give me some hints and any web sites if...
  26. V

    Flagpole Vortex: Wave Motion Causes Flag Flutter

    I was looking at this animation of vortex being shed by a cylinder http://ctr.stanford.edu/gallery/cyl3900.html and was wondering if the side to side periodic motion of the vortex is what causes a flag to fly in a wavy way on a pole?
  27. M

    Vortex Tube Design: Info and Q&A

    have anybody heared about the vortex tube?its an air cooler tube without any moving parts,and there is a link where u can get a little info about it http://www.visi.com/~darus/hilsch/ my ques: 1-could the nozzle be straigh?(const cross section? 2-which materila i should use to design this...
  28. C

    Exploring Water Vortex Drilling and Its Applications

    I'm not sure where to ask this question. I suppose it's a fluid dynamics question, a field I don't know well. I saw a show on one of the science channels a while back where it was postulated that huge holes where cut in solid rock beds in the path of a flood which was apparently the volume...
  29. C

    Vortex Panel Method derivation

    Hi, Can anybody tell me where I can find the complete derivation of the vortex panel method (book / webpage)? It's easy enough to see where the fundamental equation comes from, but completing the integration etc. to get it in the form of influence coefficients is beyond me. I have the...
  30. N

    Magnetic field inside a vortex.

    Hi all, I have a dumb question on the field inside of a vortex. A simple claculation using the magnetic flux quantum and estimating the vortex size to be 10-35nm. You get a magnetic field value of ~6.5-0.3 T. Which at first thought seems strange, maybe I'm not thinking of something correctly...
  31. P

    Calculating Velocity in a Trailing Vortex

    OK, I am calculating the velocity in a trailing vortex 4 ft laterally from the wingtip at a distance of 1 span behind the wing. I figured out that V = G/4*pi*r so in my situation, r = 4 ft, G = 2647.33 ft^2/s (this was found earlier in the problem). I get a V of ~52 ft/s. What is this...
  32. S

    Vortex Panel Method: Solving for \theta_{ij}

    In the vortex panel method the following equation is used V_{freestream}sin \beta_i - \sum_{j=1}^n \displaystyle\frac{\lambda_i}{2\pi} \int \displaystyle\frac{d\theta_{ij}}{dn_i} ds_j = 0 where n is the panel number, i is the control point at which the vortex strength is being calculated...
  33. T

    Tell me im wrong SEMI-INVERTED VORTEX

    tell me I am wrong " SEMI-INVERTED VORTEX " I have discovered a third vortex which explains the strange products and behaviours of atoms, stars and galaxy's, I am not an academic, but i would really like to discuss this with anyone, especialy if they know what their talking about
  34. L

    Investigating Air Flow from a Fan: Vortex, Equations & Airfoils

    I am doing an investigation into the air flow from a fan in my physics class. I need to know why the reason why air flows in a vortex shape from the fan (in physics terms), and what equations I can investigate (anything, e.g thrust etc). Also, I believe the airflow from a fan can be...
  35. A

    Vortex Breakdown: Significance in Airplane Design

    does anyone know what's breakdown of a vortex. what is its significance in airplane design?
  36. D

    Radial Molecular Weight Distribution X Vortex

    Chemical Separation Using Ranque-Hilsch Vortex The full title for the post should be "Can molecules be separated in solution using a Ranque-Hilsch vortex?" I am a chemist, and my conventions re: aerosols/liquids may be wrong. My interest is in a system that might enrich a soluble analyte in...
  37. U

    Creating a Vortex in Water by Ionizing with High Voltage?

    vortex ionisation Could you sustain a vortex in a vessel of water by ionising the water with high voltage ? Thanks, hope this question makes sense.
  38. A

    Has anyone heard of or read about The Vortex Theory?

    Care to share? They are claiming relativity is based on some wrong assumptions about time, that its obsolete.
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