Reflection and transmission of regular waves from/through single and double perforated thin walls

Chioukh, Nadji; Çevik, Esin; Yüksel, Yalçın

doi:10.1007/s13344-017-0053-y

Cited by 8 publications

(7 citation statements)

References 15 publications

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“…To achieve a convenient balance between accuracy and time, two distinct grids with different cell sizes were used [29]. Low frequency waves have mesh cells of 1 cm diameter in each direction, while high frequency waves have mesh cells with a diameter of 0.5 cm in each direction, as the greater the number of mesh cells, the higher the accuracy of the results [30]. To avoid any recoveries, whether from the open channel end or the wave it is critical to examine the time frame for monitoring the wave height according to the wavelength.…”

Section: Numerical Modeling / Numeričko Modeliranjementioning

confidence: 99%

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Hussein¹,

Ibrahim²

2022

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The purpose of breakwaters is to protect the ports, beaches, or beach facilities from strong waves and storms, as they help establish calm inside the port and thus achieve safety for ships and ease of operation. This paper presents an experimental and numerical study of unconventional alternatives to the vertical breakwater in order to evaluate the hydrodynamic performance of the proposed models. Two proposed cases for a semi-submerged breakwater were selected in the form of a half-pipe section with an inside diameter of 20 cm and a thickness of 1 cm. Case (a) was of the concave type of semicircular breakwater, while case (b) was of the convex type. Numerical modeling FLOW 3D was used to construct numerous scenarios for numerical simulation of the proposed breakwaters. The obtained results indicates that, when comparing the wave transmission coefficient (Kt) and its reflection coefficient (Kr) with the relative water depth (h/L), the transmission coefficient decreased with the relative height of the wave, while the reflection coefficient was completely reversed. In case (a), Kt was less than in case (b) at a range of 10% to 15%, while Kr in case (a) was bigger than in case (b) at a range of 5% to 10%. When the wave hit the breakwater, it was reflected back as its energy is dissipated in less water depth and its speed decreases as it approaches the port. The velocity of the wave decreases as it approaches the bottom, which means that the wave is affected by the depth of the water, i.e. the lower the water depth, the lower the wave velocity. Case (a) was more efficient and effective in wave dissipation, current velocity, and bed stability than case (b), so it is recommended to use case (a) due to its efficiency in protecting coastal areas and generating electricity.

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Section: Numerical Modeling / Numeričko Modeliranjementioning

confidence: 99%

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Hussein¹,

Ibrahim²

2022

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“…where A − and A + are unknown complex coefficients to be determined. The disturbances are guaranteed to be out-going waves only (see for example [16,17]). The incident velocity potential is defined as:…”

Section: Formulation Of the Problemmentioning

confidence: 99%

“…The reflection and transmission coefficients (R and T r ) are determined from the following expressions (see [16,17] and further details in Appendix B):…”

Section: Formulation Of the Problemmentioning

confidence: 99%

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Analytical and Numerical Investigations Applied to Study the Reflections and Transmissions of a Rectangular Breakwater Placed at the Bottom of a Wave Tank

et al. 2021

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The purpose of the work presented in this paper is to study the reflection and transmission coefficients resulting from the interactions of regular waves with a rectangular breakwater sited at the bottom of a tank. The present investigation is devoted to the analysis of the reflection and transmission coefficients within the framework of linearized potential flow theory using two methods, a numerical method based on the improved version of the meshless singular boundary method, and the analytical approach within the plane wave model. The numerical method is first validated by studying the accuracy of the numerical computations with respect to the number of boundary nodes and the location of the vertical boundaries of the computational domain, for different immersion ratios (h/d) and different relative lengths (w/d) of the obstacle. To assess the limitations of the analytical approach, a comparison analysis is carried out between the analytical and numerical results. To improve the calculations and the effectiveness of the analytical model, slight adjustments are made to the analytical procedure, which is termed here the corrected analytical plane wave model. Finally, the effects of the immersion ratio (h/d) and the relative length (w/d) of the obstacle on the reflection and transmission coefficients are computed using the three methods, and discussed for several wave and structural conditions.

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“…In this model, two separate grids of different cell sizes were used to achieve a convenient balance between precision/accuracy and time measurement [4]. Low frequency waves have mesh cells that are 1 cm in diameter in each direction, and high frequency waves have mesh cells that are 0.5 cm in diameter for each direction [15]. To avoid any recoveries, whether from the open channel's end or the wave paddle, it's critical to analyze the time frame for measuring the wave height according to the wavelength.…”

Section: Numerical Moldingmentioning

confidence: 99%

Study Unconventional Alternatives to Vertical Breakwater

H¹,

Mahmoud

2021

Journal of Engineering Research

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The main objective of the breakwaters is to protect the port, the beach or the beach facilities from strong waves and storms, as they help to establish calm inside the port and thus achieve safety for ships, and ease of operation. This research aims to present study unconventional alternatives to vertical breakwater. In this study, two different models of vertical wave barriers implemented were chosen for their study and evaluation of the hydrodynamic performance. The first model is a vertical wall with circular slots and the second model is a vertical wall with square slots. A comparison was made between the two models it was found that the square slots reduce the transmission of waves more than circular slots by 5 to 20%. The use of two circular slotted walls decreases wave transmission by up to 30% and increases wave energy dissipation by up to 40% as compared to a single wall. With increasing relative length (h/L), the horizontal wave force rises. The relative wave forces (F/Fo), at porosity ( ) =0.25, was greater than at porosity ( ) = 0.50 by 10 to 30%. At the openings, the wave velocity is high, and the wave energy dissipation factor was also high; the higher the wave amplitude, the greater the wave energy dissipation factor.

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Reflection and transmission of regular waves from/through single and double perforated thin walls

Cited by 8 publications

References 15 publications

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Experimental and Numerical Study on the Hydrodynamic Performance of Suspended Curved Breakwaters

Analytical and Numerical Investigations Applied to Study the Reflections and Transmissions of a Rectangular Breakwater Placed at the Bottom of a Wave Tank

Study Unconventional Alternatives to Vertical Breakwater

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