Numerical and experimental modeling of water wave interaction with rubble mound offshore porous breakwaters

Koley, Santanu; Panduranga, Kottala; Almashan, Nourah; Neelamani, S.; Al-Ragum, Alanoud

doi:10.1016/j.oceaneng.2020.108218

Cited by 40 publications

(11 citation statements)

References 22 publications

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“…Both simulations show that Kr decreases with increasing wave steepness. This result agrees with Koley et al [13], as shown in Figure 5. For structures that have a slope will give a relatively smaller Kr than the upright structure.…”

Section: Resultssupporting

confidence: 94%

“…We found that the reflection coefficient decreased as the wave steepness increased. This study's results are under Koley et al [13] and Park et al [14]. However, the transmission coefficient (Kt) is directly proportional to the steepness of the wave (Hi/L) means the more significant the steepness of the wave (Hi/L), the value transmission coefficient (Kt) is increasing.…”

Section: Resultsmentioning

confidence: 60%

“…New reflection formulae have been developed, one for hardly and partly reshaping berm breakwaters and thoroughly reshaping berm breakwaters. Koley et al [13] and Park et al [14] conducted laboratory experiments. The reflection coefficient and run-up height of breakwaters are investigated for different widths and heights of the submerged structure with different distances between adjacent two breakwaters.…”

Section: Introductionmentioning

confidence: 99%

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Physical Model Simulation: Influences the Shape of Breakwater Structures on the Coefficient of Transmission and Reflection

Pujianiki¹,

Dayanti²

2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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Breakwater is used to break the wave energy that travels towards the beach. Part of the wave energy will be destroyed, transmitted, or reflected. The shape of breakwater affects the ability to break the wave energy. There are no researchers who have compared the effect of the shape of the breakwater structure on wave energy transmitted and reflected. This study aims to simulate the transmission coefficient (Kt) and reflection coefficient (Kr) of the breakwater in various forms. Physical models with a 1:100 scale model is used. A flap-type wave generator in a wave flume is used to generate the wave. Waves regularly move in one direction passed the model. The results showed an effect of the shape of the breakwater structure on Kt and Kr. By increasing the wave steepness (Hi/L), Kt's value will increase in the upright structure and decrease in the sloping structure. At the same time, the value of Kr tends to decrease when the wave steepness increases. The value of Kt is relatively smaller in upright structures than in sloping structures. By adding porosity to the structure, the Kt value will increase, followed by Kr's reduction. By increasing the crest B's width, Kt appears to increase, but the crest width does not significantly affect Kr. Kt and Kr are significantly smaller if the breakwater structure is inclined towards the sea or inverted trapezium. This type of breakwater has never been encountered in the field before.

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Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Physical Model Simulation: Influences the Shape of Breakwater Structures on the Coefficient of Transmission and Reflection

Pujianiki¹,

Dayanti²

2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…3 ITERATIVE BOUNDARY ELEMENT METHOD In this section, an iterative boundary element method is adopted to solve the associated boundary value problem, as discussed in Section 2. Applying Green's second identity to the velocity potential and Green's function , we obtain the resulting integral equation in each of the regions Ω for 1, 2, … 6, as ( [20])…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…It is assumed that on each boundary element, and / are constants. The discretized form of eqn (10) can be written as [20], [21] 0,…”

Section: Mathematical Formulationmentioning

confidence: 99%

Mitigation of Wave Loads on the Floating Porous Structure by Slotted Screens

Panduranga

Koley

2021

WIT Transactions on Engineering Sciences

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This paper presents the effectiveness of partially immersed slotted screens placed at a finite distance away from the floating porous breakwater to mitigate the wave-induced hydrodynamic forces on the floating breakwater. The fluid motion within the porous structure is analyzed using the Sollitt and Cross model. Further, a non-linear pressure drop condition on the slotted screens is considered, which includes the effects of wave height on the incident wave energy dissipation by the slotted screens. In the presence of the non-linear boundary condition on the slotted screen, the associated boundary value problem is solved numerically using the iterative multi-domain boundary element method. Various physical interests of the study, such as reflection coefficient, transmission coefficient, wave energy dissipation coefficient, and wave forces acting on the slotted screens and floating breakwater, are analyzed in detail for various wave and structural parameters. The results show that the maximum wave-induced forces acting on the porous breakwater are observed when the gap between the slotted screen and porous breakwater is approximately equal to an integer multiple of half of the wavelength for different porosities of the slotted screens.

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Performance of multilayered porous breakwater under irregular waves having different wave spectrum

Dash,

Koley,

Paul

et al. 2024

Engineering Reports

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In this present work, the performance of a two‐layered thick porous breakwater of trapezoidal structure is investigated under the action of irregular waves. To investigate the physical problem, the classical linear water wave theory has been taken into consideration. To analyze the effect of irregular waves on the multilayered structure, two unidirectional wave spectra, namely the Pierson–Moskowitz and JONSWAP spectra based on the frequency domains are considered. Three different sea states are taken to analyze the impact of irregular waves on the multilayered porous breakwater. The constant boundary element method is used to handle the aforementioned boundary value problem, which is considered one of the most efficient numerical tools for handling complex structured open sea problems. Several wave characteristics associated with the spectral density functions are demonstrated and analyzed for a variety of structural and spectral parameters. The findings suggest that the adoption of suitable porous material for the construction of these breakwaters can significantly enhance the energy dissipation and thereby minimize the wave force on the structure.

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Numerical and experimental modeling of water wave interaction with rubble mound offshore porous breakwaters

Cited by 40 publications

References 22 publications

Physical Model Simulation: Influences the Shape of Breakwater Structures on the Coefficient of Transmission and Reflection

Physical Model Simulation: Influences the Shape of Breakwater Structures on the Coefficient of Transmission and Reflection

Mitigation of Wave Loads on the Floating Porous Structure by Slotted Screens

Performance of multilayered porous breakwater under irregular waves having different wave spectrum

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