Hydrodynamic characteristics of double permeable breakwater under regular waves

Koraim, A.S.; Heikal, E.M.; Rageh, O. S.

doi:10.1016/j.marstruc.2011.06.004

Cited by 45 publications

(8 citation statements)

References 10 publications

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“…At (10) and At (11) The coefficients , , and might be computed by utilizing the matching criteria (i.e. adding( 9), (10), and( 11) with (4) as well as (5) the matrix formula at the breakwater:…”

Section: Analytical Studymentioning

confidence: 99%

Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Badr Hussein,

Ibrahim

2021

Engineering Research Journal - Faculty of Engineering (Shoubra)

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The main objective of the breakwater systems is to protect the closed water yard from waves and storms, as they help bring calm inside the port and thus achieve safety for ships inside it, and ease of operation. This paper presents the results of the study on wave interaction with vertical slotted water breakers. The research was conducted on two breakwater models, each of which was defined as follows: The first breakwater has two perforated walls: the lower portion is porous, while the top part is solid, while the second wall is the polar opposite of the first, with a porosity of 50% in both. The second breakwater is similar to the first, but it lacks the horizontal slit wall. The first and second breakwaters were compared, and the result indicate that the first breakwater hydrodynamic output performance the second in the range (10-15 %).The second breakwater is affected by the wave force less in the range (85-90%) than its breaker first counterpart. On the models that have been tested, the wave's force increases as its relative length (h/L) increases. According to the results of this study, the transmission factor (kt) rises as the relative length (h / L) decreases, while the reflection factor (kr) decreases as the relative length (h / L) reduces. FLOW-3D has the ability to calculate the velocities in front and behind the breakwaters and can be used in similar studies.

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Section: Analytical Studymentioning

confidence: 99%

Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Badr Hussein,

Ibrahim

2021

Engineering Research Journal - Faculty of Engineering (Shoubra)

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“…Further, the permeable vertical walls are constructed to prevent the free passage of oblique incident waves, Dalian Chemical Production Terminal, Republic of China (Huang et al, 2011) and Dieppe, France (Belorgey et al, 2003) opted the permeable walls to protect the mainlands from incoming waves. The double vertical walls with finite spacing are suggested by Das et al (1997), Sahoo et al (2000), Koraim et al (2011) to achieve the better wave trapping. After that, Karmakar and Guedes Soares (2015) proposed multiple bottom standing barriers to attenuate the wave energy using the least-squares approximation.…”

Section: Introductionmentioning

confidence: 99%

Influence of Impermeable Elevated Bottom on the Wave Scattering due to Multiple Porous Structures

Venkateswarlu¹,

Karmakar²

2020

JAFM

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The significance of multiple porous structures with finite spacing upon elevated seabed in the presence and absence of the leeward wall is examined under oblique wave impinging. Fluid propagation is assumed over the impermeable elevated bottom, and the fluid realm is separated into open water and porous structure regions. Continuity of the dynamic pressure and mass fluxes at the interfaces of the porous structure and the open water regions are adopted. The resistance and reactance due to the presence of the porous structure are taken into account using the porous structure dispersion relation. The numerical model is developed based on the eigenfunction expansion method along with matched velocity potentials at the interfaces of open water and the porous block regions. The wave reflection and transmission characteristics, energy damping and wave force impact on the leeward wall is analysed. The significance of the porosity, structural width, angle of incidence, width between the two structures and water chamber length is studied considering multiple porous blocks with finite spacing under oblique wave impinging in the presence and absence of leeward wall. The numerical results obtained in the present study agrees well with the theoretical and experimental results available in the literature. The present study illustrates that, with the increase in the number of porous blocks and gap between the porous blocks, the resonating trend is observed in the wave transformation and the influence of the elevated step height is revealed for the wave trapping.

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“…Li et al (2003) investigated the problem of interaction of oblique waves with two partially immersed porous breakwaters using eigenfunction expansion method. Koraim et al (2011) determined the wave reflection, transmission and energy dissipation of a system of double vertical wall with horizontal slots in the lower part experimentally as well as theoretically.…”

Section: Introductionmentioning

confidence: 99%

Scattering of water waves by a pair of vertical porous plates

Gayen

Mondal

2015

Geophysical & Astrophysical Fluid Dynamics

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The two-dimensional problem of scattering of small-amplitude surface water-waves by two symmetric vertical thin porous plates is investigated here assuming the linear theory. The problem is formulated in terms of two hypersingular integral equations of the second kind involving the discontinuities in the unknown symmetric and antisymmetric potential functions describing the motion in the fluid across one of the plates. Exploiting the conditions at the two tips of the plate, the discontinuity is approximated by expanding it in terms of a finite series involving Chebyshev polynomials of the second kind multiplied by an appropriate weight function, and then the integral equations are solved numerically by a collocation method. Using the solutions, the reflection and the transmission coefficient are computed numerically. The numerical results for the reflection and the transmission coefficients, amount of energy dissipation and the hydrodynamic forces are depicted graphically against the wave number. Known results for the reflection coefficient for two impermeable plates are recovered when the porous-effect parameter G is set to be equal to zero. An energy identity for the permeable plates is determined.

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Hydrodynamic characteristics of double permeable breakwater under regular waves

Cited by 45 publications

References 10 publications

Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Study on Hydrodynamic Performance of Unsymmetrical Double Vertical Slotted Barriers

Influence of Impermeable Elevated Bottom on the Wave Scattering due to Multiple Porous Structures

Scattering of water waves by a pair of vertical porous plates

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