In fluid dynamics, vortex shedding is an oscillating flow that takes place when a fluid such as air or water flows past a bluff (as opposed to streamlined) 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 forming a 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.
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| - Desprendimiento de vórtice (es)
- Vortex shedding (en)
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| - En dinámica de fluidos, el desprendimiento de vórtices es un flujo oscilante que tiene lugar cuándo un fluido como aire o agua fluye contra un obstáculo a determinadas velocidades que dependen del tamaño y forma del obstáculo. En esta situación aparecen vórtices en la parte del obstáculo opuesta al flujo y se desprenden alternativamente formando una Calle de vórtices de Von Kármán. Éstos vórtices crean zonas de baja presión y hacen que el objeto que forma el obstáculo sufra fuerzas que tienden a moverlo alternativamente hacia las zonas de baja presión.
* Datos: Q28129961 (es)
- In fluid dynamics, vortex shedding is an oscillating flow that takes place when a fluid such as air or water flows past a bluff (as opposed to streamlined) 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 forming a 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. (en)
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| - En dinámica de fluidos, el desprendimiento de vórtices es un flujo oscilante que tiene lugar cuándo un fluido como aire o agua fluye contra un obstáculo a determinadas velocidades que dependen del tamaño y forma del obstáculo. En esta situación aparecen vórtices en la parte del obstáculo opuesta al flujo y se desprenden alternativamente formando una Calle de vórtices de Von Kármán. Éstos vórtices crean zonas de baja presión y hacen que el objeto que forma el obstáculo sufra fuerzas que tienden a moverlo alternativamente hacia las zonas de baja presión. Si la estructura que forma el obstáculo no es lo bastante rígida y la frecuencia de desprendimiento de vórtices se aproxima a la frecuencia de resonancia de la estructura, entonces la estructura puede entrar en resonancia, vibrando con una oscilación armónica producida por la energía del flujo. Esta es la causa por ejemplo de la vibración de las antenas de radio de los automóviles a algunas velocidades. Las chimeneas altas constituidas por tubos de acero de pared delgada pueden ser suficientemente flexibles como para que, sometidas a vientos con una velocidad próxima a la crítica, el desprendimiento de vórtices provoque en la chimenea violentas oscilaciones que pueden averiarla o destruirla.
* Datos: Q28129961 (es)
- In fluid dynamics, vortex shedding is an oscillating flow that takes place when a fluid such as air or water flows past a bluff (as opposed to streamlined) 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 forming a 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 bluff structure is not mounted rigidly and the frequency of vortex shedding matches the resonance frequency of the structure, then the structure can begin to resonate, vibrating with harmonic oscillations driven by the energy of the flow. This vibration is the cause for overhead power line wires humming in the wind, and for the fluttering of automobile whip radio antennas at some speeds. Tall chimneys constructed of thin-walled steel tubes 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. 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. In northeastern Iran, the Hashemi-Nejad natural gas refinery's flare stacks suffered vortex shedding seven times from 1975 to 2003. Some simulation and analyses were done, which revealed that the main cause was the interaction of the pilot flame and flare stack. The problem was solved by removing the pilot. (en)
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