Approximation to the hydrodynamics of floating pontoons under oblique waves

Abul-Azm, A.G.; Gesraha, Mohamed. R.

doi:10.1016/s0029-8018(98)00057-2

Cited by 76 publications

(27 citation statements)

References 9 publications

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“…Reflection and transmission coefficients K r and K t are plotted in Figure 4 as functions of relative depth k 0 h 1 for several values of draft d=h 1 , u = 0 8 and 30 8 . The results illustrate that an increase in draft will result in an increase in wave reflection while an increase in draft will result in a decrease in wave transmission.…”

Section: Floating Breakwater Without a Backwallmentioning

confidence: 99%

Oblique interaction between water waves and a partially submerged rectangular breakwater

Kaligatla

Prasad

Tabssum

2019

Proceedings of the Institution of Mechanical Engineers, Part M:

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A problem of oblique wave scattering by a rectangular breakwater floating in water of uneven depth is solved by applying matched eigenfunction expansion method. Three positions of breakwater are considered. The width and draft of breakwater are assumed to be finite, whereas its length is infinite. Breakwater is studied in the settings of without backwall and with a backwall. By using matching conditions at interface boundaries and making use of orthogonal property of eigenfunctions, the problem is converted to a system of algebraic equations. Breakwater’s position is proposed for which wave reflection, transmission, and force on wall are optimized. The breakwater with certain width and draft reflects more wave energy than the one with zero-draft. In the case of absence of wall, breakwater at lee side to the step induces least transmission of waves. In the case of presence of wall, suitable position of breakwater is suggested based on a range of wave frequency to mitigate force on wall. Optimum distances between wall and breakwater are found to attain less force on wall. Using Green’s identity, energy balance relation is derived to check accuracy in results. The findings are likely to be useful to assess the performance of a breakwater in different positions in water of uneven depth.

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Section: Floating Breakwater Without a Backwallmentioning

confidence: 99%

Oblique interaction between water waves and a partially submerged rectangular breakwater

Kaligatla

Prasad

Tabssum

2019

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…The most simple and durable type of floating breakwater is of a single pontoon type, which is generally made of ferroconcrete in cuboid shapes. For the single pontoon floating breakwater (SPFB) moored by the vertical pile or mooring lines, extensive theoretical [3][4][5], numerical [6][7][8], and experimental [9][10][11] solutions has been executed, although with different highlights such as wave reflections/transmissions, motion responses, hydroelasticities, wave loads and effects of the mooring system. Another attractive option for attenuating waves and reducing wave turbulence is dual pontoon floating breakwater (DPFB).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic performance of floating breakwaters in long wave regime: An experimental study

Cheng

Cui

et al. 2018

Ocean Engineering

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Hydrodynamic behavior tests of long water waves with the floating breakwater is a important mission in some near-reef sea areas. Especially, the performance of the wave would be more complex when natural periods of the motion are defined within the range of wave frequencies. In this study, a series of experiments are conducted under long regular wave actions to investigate the hydrodynamic performance of four slack-moored floating breakwater models, which include single box, single porous box, double cylindrical pontoon and double cylindrical pontoon with mesh cage and suspending balls. The experimental results display that the wave transmission and wave energy dissipation for four models have multiple turning points produced near the natural periods of floating structures in long wave regime, while that is not evident for the reflection coefficient. The resonant responses are also observed in the motions and mooring tension of four models, which further explain the turning point phenomenon appeared in transmission and dissipation coefficient. The overall results reveal that the porous plates and mesh cage with balls is effective for mitigating the turning point phenomenon due to additional water mass and damping effects, and also holds the potential for reducing the motions and mooring forces, which validate the feasibility of the novel floating breakwaters.

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“…It works by reflecting incident waves in a large extent, so that the leeward transmitted waves can be reduced greatly. The hydrodynamic performance of such breakwater has been systematically studied [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Analytical Study on an Oscillating Buoy Wave Energy Converter Integrated into a Fixed Box‐Type Breakwater

Zhao

Ning

Zhang

et al. 2017

Mathematical Problems in Engineering

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An oscillating buoy wave energy converter (WEC) integrated to an existing box-type breakwater is introduced in this study. The buoy is installed on the existing breakwater and designed to be much smaller than the breakwater in scale, aiming to reduce the construction cost of the WEC. The oscillating buoy works as a heave-type WEC in front of the breakwater towards the incident waves. A power take-off (PTO) system is installed on the topside of the breakwater to harvest the kinetic energy (in heave mode) of the floating buoy. The hydrodynamic performance of this system is studied analytically based on linear potential-flow theory. Effects of the geometrical parameters on the reflection and transmission coefficients and the capture width ratio (CWR) of the system are investigated. Results show that the maximum efficiency of the energy extraction can reach 80% or even higher. Compared with the isolated box-type breakwater, the reflection coefficient can be effectively decreased by using this oscillating buoy WEC, with unchanged transmission coefficient. Thus, the possibility of capturing the wave energy with the oscillating buoy WEC integrated into breakwaters is shown.

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Approximation to the hydrodynamics of floating pontoons under oblique waves

Cited by 76 publications

References 9 publications

Oblique interaction between water waves and a partially submerged rectangular breakwater

Oblique interaction between water waves and a partially submerged rectangular breakwater

Hydrodynamic performance of floating breakwaters in long wave regime: An experimental study

Analytical Study on an Oscillating Buoy Wave Energy Converter Integrated into a Fixed Box‐Type Breakwater

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