Interaction of gravity waves with bottom-standing submerged structures having perforated outer-layer placed on a sloping bed

Koley, Santanu; Sarkar, Arindam; Sahoo, T.

doi:10.1016/j.apor.2015.06.003

Cited by 45 publications

(11 citation statements)

References 38 publications

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“…Rambabu and Mani (2005) conducted the numerical study on multiple trapezoidal breakwaters and reported that the high energy damping is achieved with the porous breakwater compared with the impermeable breakwater. Koley et al (2015a) examined the trapezoidal breakwater considering perforated outer layer and rigid inner layer placed on the sloping seabed. The leeward wall on the sloping seabed and uniform seabed with porous breakwater are analysed using coupled eigenfunction-boundary element method.…”

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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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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“…This means that for the present pile-rock breakwater, the most part of wave energy dissipation is contributed by the rock core and only a small part of wave energy dissipation is due to the closely spaced piles. This is the key finding of this study in view of recently published work in the literature 15,16 that submerged porous structures with no slotted walls have been examined. This may be further confirmed by Figure 8, which shows the effect of the slotted wall porosity on the hydrodynamic quantities of the submerged pile-rock breakwater.…”

Section: Resultsmentioning

confidence: 74%

“…29 The hydrodynamic quantities of two submerged perforated walls in Oumeraci and Koether 7 are calculated by the present analytical solution. In our calculations, the inertial coefficients s 1 = s 2 = 1 are used, and the resistance coefficients f 1 and f 2 are estimated using equation (15). Figure 6 gives comparison between the present calculation results and the experimental data of Oumeraci and Koether.…”

Section: Comparison With Experimental Data Of Special Casesmentioning

confidence: 93%

“…For theoretical analysis, the classical porous medium model of Sollitt and Cross 10 has been widely used to describe the wave dissipation effect of rubble mound breakwaters. Relevant analytical solutions for wave motions over submerged porous bars, which were developed using matched eigenfunction expansions, can be found in Rojanakamthorn et al, 11 Lee and Liu, 12 Losada et al 13 and Lan et al 14 More recently, Koley et al 15 used multi-domain boundary element method (BEM) to examine wave scattering by a submerged porous bar with an impermeable core placed on a sloping bottom. Behera et al 16 developed both analytical solution and multi-domain BEM solution for wave motion over a submerged porous bar in a two-layer fluid.…”

Section: Introductionmentioning

confidence: 99%

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Analytical study of oblique wave scattering by a submerged pile–rock breakwater

Liu

2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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This study examines the scattering of obliquely incident waves by a submerged pile-rock breakwater, which consists of two rows of closely spaced piles and a rock core between them. Based on linear potential theory, a closed-form analytical solution for the present problem is developed using matched eigenfunction expansions. The analytical solution is novel because of the new submerged pile-rock-type breakwater. The analytical solution is confirmed by an independently developed multi-domain boundary element method solution. The analytical solution is also compared with experimental data for three special cases of the present breakwater. Numerical examples are presented to investigate the effects of structural parameters and wave parameters on the reflection, transmission and energy loss coefficients of the breakwater. It is found that the wave energy dissipation by the submerged pile-rock breakwater is mainly contributed by the rock core, and only a small part of wave energy dissipation is due to the closely spaced piles.

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“…(1), (2), (3), (5), (6), and (8), is transformed to integral equations using the Green's theorem, and then solved by a MDBEM. Further details of the method can be found in Koley et al (2015aKoley et al ( , 2015b. For smooth (constant) elements the general form of the integral equation is written as: , lying on a boundary j  of a flow region (j=1,2,3).…”

Section: Numerical Solution By the Multi-domain Boundary Element Methmentioning

confidence: 99%

Performance of Porous Marine Structures of Single and Double Perforated Seawalls in Regular Oblique Waves

Chioukh

Boukhari

Yüksel

et al. 2017

Int. Conf. Coastal. Eng.

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In the present paper we examine the performance of two very common types of wave absorbing porous marine structures under regular oblique waves. The first structure consists of a single perforated vertical seawall, whereas the second consists of two perforated vertical seawalls creating what is called a chamber system (Jarlan type breakwater). The structures are surface piercing thus eliminating wave overtopping. Two methods are used for the present investigation. In the first method the problem of the interaction of obliquely incident linear waves upon a pair of porous vertical seawalls is first formulated in the context of the linear diffraction theory. The resulting boundary integral equation, which is matched with far-field solutions represented in terms of analytical series with unknown coefficients, and appropriate boundary conditions at the free surface, seabed and seawalls, is then solved numerically using the multi-domain boundary element method. In the second method a semi-analytical solution is developed by means of the eigenfunction expansions and a minimization approach using a least square method. In both methods the dissipation of the wave energy due to the presence of the perforated seawalls is represented by a simple yet effective relation in terms of the porosity parameter appropriate for thin perforated walls. The results are presented in terms of reflection and transmission coefficients, and the wave energy dissipation. Effects of the incident wave angles, porosities and depths of the walls and other major parameters of interest are explored.

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Interaction of gravity waves with bottom-standing submerged structures having perforated outer-layer placed on a sloping bed

Cited by 45 publications

References 38 publications

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

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

Analytical study of oblique wave scattering by a submerged pile–rock breakwater

Performance of Porous Marine Structures of Single and Double Perforated Seawalls in Regular Oblique Waves

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