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- Vortex_shedding abstract "In fluid dynamics, vortex shedding is an oscillating flow that takes place when a fluid such as air or water flows past a cylindrical body at certain velocities, depending on the size and shape of the body. In this flow, vortices are created at the back of the body and detach periodically from either side of the body. See Von Kármán vortex street. The fluid flow past the object creates alternating low-pressure vortices on the downstream side of the object. The object will tend to move toward the low-pressure zone.If the cylindrical structure is not mounted rigidly and the frequency of vortex shedding matches the resonance frequency of the structure, the structure can begin to resonate, vibrating with harmonic oscillations driven by the energy of the flow. This vibration is the cause of the "singing" of overhead power line wires in a wind, and the fluttering of automobile whip radio antennas at some speeds. Tall chimneys constructed of thin-walled steel tube can be sufficiently flexible that, in air flow with a speed in the critical range, vortex shedding can drive the chimney into violent oscillations that can damage or destroy the chimney. These chimneys can be protected from this phenomenon by installing a series of fences (sometimes called strakes or spoilers) at the top and running down the exterior of the chimney for approximately 20% of its length. The fences are usually located in a helical pattern. The fences prevent strong vortex shedding with low separation frequencies. The optimal pitch for vortex shedding is a 5D pitch (5 x the diameter of the stack).Vortex shedding was one of the causes proposed for the failure of the original Tacoma Narrows Bridge (Galloping Gertie) in 1940, but was rejected because the frequency of the vortex shedding did not match that of the bridge. The bridge actually failed by aeroelastic flutter.A thrill ride, "VertiGo" at Cedar Point in Sandusky, Ohio suffered vortex shedding during the winter of 2001, causing one of the three towers to collapse. The ride was closed for the winter at the time.".
- Vortex_shedding thumbnail Vortex-street-animation.gif?width=300.
- Vortex_shedding wikiPageExternalLink vortex_shedding.
- Vortex_shedding wikiPageExternalLink Tacoma_Narrows.
- Vortex_shedding wikiPageExternalLink sf1.html.
- Vortex_shedding wikiPageExternalLink watch?v=_AJgEa2dbJU.
- Vortex_shedding wikiPageID "1609956".
- Vortex_shedding wikiPageRevisionID "579523333".
- Vortex_shedding hasPhotoCollection Vortex_shedding.
- Vortex_shedding subject Category:Fluid_dynamics.
- Vortex_shedding subject Category:Vortices.
- Vortex_shedding type Abstraction100002137.
- Vortex_shedding type Attribute100024264.
- Vortex_shedding type RoundShape113865483.
- Vortex_shedding type Shape100027807.
- Vortex_shedding type Vortices.
- Vortex_shedding type Whirl113878112.
- Vortex_shedding comment "In fluid dynamics, vortex shedding is an oscillating flow that takes place when a fluid such as air or water flows past a cylindrical body at certain velocities, depending on the size and shape of the body. In this flow, vortices are created at the back of the body and detach periodically from either side of the body. See Von Kármán vortex street. The fluid flow past the object creates alternating low-pressure vortices on the downstream side of the object.".
- Vortex_shedding label "Vortex shedding".
- Vortex_shedding sameAs m.05gft2.
- Vortex_shedding sameAs Q7941933.
- Vortex_shedding sameAs Q7941933.
- Vortex_shedding sameAs Vortex_shedding.
- Vortex_shedding wasDerivedFrom Vortex_shedding?oldid=579523333.
- Vortex_shedding depiction Vortex-street-animation.gif.
- Vortex_shedding isPrimaryTopicOf Vortex_shedding.
