Design Optimization of a Porous Box-Type Breakwater Subjected to Regular Waves

Pereira, Eric Joseph; Teh, Hee Min; Manoharan, Lachmi Sri; Lim, Chai Heng

doi:10.1051/matecconf/201820301018

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…In [5], the theory of wave transmission and reflection by an infinitely long porous structure was extended for oblique wave incidence, whereas in [6] a semi-porous cylindrical breakwater was examined, using the eigenfunction expansion method, concluding that the wave loads on the breakwater were reduced due to the semi-porous portion of the cylinder. Subsequently, several studies followed, examining theoretically and experimentally the induced wave-flow in a porous breakwater and its capability to dissipate the wave energy and to minimize the environmental impact [7][8][9][10][11]. Furthermore, porous plates have also been studied in the literature due to their capability of free exchange of water or marine species.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Hydrodynamic Analysis of a Surface-Piercing Porous Cylindrical Body

Konispoliatis

Chatjigeorgiou

Mavrakos

2021

Fluids

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In the present study, the diffraction and the radiation problems of water waves by a surface-piercing porous cylindrical body are considered. The idea conceived is based on the capability of porous structures to dissipate the wave energy and to minimize the environmental impact, developing wave attenuation and protection. In the context of linear wave theory, a three-dimensional solution based on the eigenfunction expansion method is developed for the determination of the velocity potential of the flow field around the cylindrical body. Numerical results are presented and discussed concerning the wave elevation and the hydrodynamic forces on the examined body for various values of porosity coefficients. The results revealed that porosity plays a key role in reducing/controlling the wave loads on the structure and the wave run-up, hence porous barriers can be set up to protect a marine structure against wave attack.

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Section: Introductionmentioning

confidence: 99%

“…Porous coefficient G and the corresponding opening rate τ of the porous surface for ε = 0.05, based on Equation(11).…”

mentioning

confidence: 99%

Theoretical Hydrodynamic Analysis of a Surface-Piercing Porous Cylindrical Body

Konispoliatis

Chatjigeorgiou

Mavrakos

2021

Fluids

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Scattering of Surface Gravity Waves by a Pair of Floating Porous Boxes

Vijay

Sahoo

2019

Journal of Offshore Mechanics and Arctic Engineering

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A numerical model is developed based on multidomain boundary element method (MBEM) to investigate the scattering of surface gravity waves by a pair of floating porous boxes. This study reveals that there is a significant reduction in wave forces acting on the boxes with the introduction of structural porosity. Moderate porosity is highly effective for shallow and intermediate water depth for dissipating wave energy, while high porosity is more suitable in case of deep water. A major part of the wave energy is trapped by the porous boxes when the widths of the boxes are close to half of the wavelength of the incident waves. Apart from wave reflection and energy dissipation, a pair of floating porous boxes traps a part of wave energy, which helps in the wave attenuation on the lee side of the porous box. Horizontal and vertical forces of the seaside porous box are 180 deg out of phase, while they are in-phase in case of the box located on the lee side. Optima in the horizontal and vertical forces are attained when the distance between the boxes are at periodic intervals of half the wavelength. This study will be of immense help in the design of box-type porous structures as effective wave barriers for the creation of tranquility zone in the marine environment.

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Scattering of Water Waves by Very Large Floating Structure in the Presence of a Porous Box

Singla

Behera

Martha

et al. 2022

Journal of Offshore Mechanics and Arctic Engineering

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We investigate the effectiveness of a porous box in attenuating the structural response of a very large floating structure (VLFS). Assuming the water depth to be finite and small amplitude water wave theory, the physical problem is formulated by employing Darcy's law for flow past a porous structure. The boundary value problem is reduced to a system of linear algebraic equations with the aid of matched eigenfunction expansion method. Further, these simultaneous equations are solved numerically to compute physical quantities. The mathematical model is validated through a comparison with the theoretical results available in the literature. The elastic plate deflection, forces acting on the box and free surface elevation are computed. The efficiency of the given system in transmitting, reflecting and dissipating the incident wave energy is analysed through various graphs. The study reveals that the width and height of the porous box are critical towards the trapping of incident waves inside the box and dissipating the maximum amount of incident wave energy in reduction of wave transmission in the lee side of the structure and thereby attenuating the structural response of the VLFS.

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Design Optimization of a Porous Box-Type Breakwater Subjected to Regular Waves

Cited by 4 publications

References 12 publications

Theoretical Hydrodynamic Analysis of a Surface-Piercing Porous Cylindrical Body

Theoretical Hydrodynamic Analysis of a Surface-Piercing Porous Cylindrical Body

Scattering of Surface Gravity Waves by a Pair of Floating Porous Boxes

Scattering of Water Waves by Very Large Floating Structure in the Presence of a Porous Box

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