Vortex-Induced Vibrations Essay

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Fluid dynamics relating to bluff bodies, non-streamlined structures or streamlined bodies at large angles of attack, remains a critical focus of study within the fluid mechanics community. One particular area of interests involves the occurrence of fluid-induced vibrations, or more commonly known as vortex-induced vibrations (VIV’s), exerted on bluff bodies. Due to the production of vortex shedding beyond bluff cross sections, an alternating pressure distribution produces periodic fluctuations in lift and drag forces on the surface of the body; generating a vibrational response. This phenomenon plays a significant role in the design of common engineering structures such as bridges, oceanic structures, offshore drilling risers, cables, heat exchangers and numerous other engineering applications. VIV’s have been known to have a detrimental impact on structural fatigue lifespans with the collapse of the Tacoma Narrows Bridge serving as the textbook example. While not solely attributed to VIV’s [1], this structural failure was highly influenced by resonant vibrations influenced by VIV’s and serves as motivation in understanding VIV’s and their effect on engineering structures.
In attempts to better understand VIV’s and their
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This mechanism is source in the formation of boundary layers and is highly sensitive to the Reynold’s number. At low Re values, frictional drag influences the nature of attached flows around a bluff body. In contrast, pressure drag is attributed to motion produced by eddies generated in the flow at higher Re values, but is less sensitive to the Reynold’s number. It is important for separated flows and is associated with the formation of the wake following a bluff body. For streamlined bodies, viscous drag has more of a prominent role, while pressure drag has more of an effect on the behavior of bluff

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