Vortex Structure and Energy Dissipation Near a Vertical Plate Under Wave Action

Ikeda, Syunsuke; Asaeda, Takashi; Nomoto, Kenji; Kimura, Eriko

doi:10.2208/jscej.1985.363_87

Cited by 2 publications

(1 citation statement)

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“…The results showed that the energy dissipation rate can be estimated by the resistance coefficient. Ikeda et al [9] investigated the vortex structure and energy dissipation near both sides of the edge of a vertical plate under wave action, and discussed the discrete vortices created by a submerged dike and the estimation of transmitted waves. It was found that the vortex can be numerically simulated with Lamb-Oseen vortices, confirming that the wave energy is dissipated as a result of the formation of the vortices.…”

Section: Introductionmentioning

confidence: 99%

Visualization Investigation of Energy Dissipation Induced by Eddy Currents for a Solitary-Like Wave Passing over Submerged Breakwater Sets

Shih

Weng

2020

JMSE

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Wave attenuation for the purpose of coastal protection has been an important topic in coastal engineering. Wave attenuation in relation to the vortices induced by a solitary-like wave propagating over submerged breakwaters (BWs) is discussed in this paper. A series of hydraulic model experiments was conducted to investigate the occurrence of eddies, the types and combinations of submerged BWs, and related phenomena of the range expansion of vortices. The microscopic changes in the flow field, the variation of eddies, and the distributions of streamlines were analyzed using the particle image velocimetry (PIV) technique. The measured transmission and reflection coefficients, along with the concept of energy conservation, were also examined to support the results. The results indicate that the attenuated wave energy is related to the induced vortices, and show that the total relative vortex energy for rectangular submerged BWs is larger than that for undulating submerged BWs in both the single and composite sets. The magnitude of the maximum vorticity of the undulating BW sets is larger and more concentrated than that of the rectangular BW sets; however, the total vortex energy is slightly smaller owing to the narrower vortex area range.

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Section: Introductionmentioning

confidence: 99%