Composite breakwater of a submerged horizontal flexible porous membrane with a lower rubble mound

Guo, Y.C.; Mohapatra, Soudamini; Soares, C. Guedes

doi:10.1016/j.apor.2020.102371

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…The use of multiple discs in an array was found to be a promising approach for wave power dissipation. In addition, the use of a horizontal, flexible porous membrane as an effective composite breakwater type was examined in [18,19]. Specifically, a semi-analytical model based on a matched eigenfunction expansion method was presented, and it was concluded that an optimal porosity parameter can be obtained which results in better wave-blocking performance and a smaller vertical force on the flexible porous structure.…”

Section: Introductionmentioning

confidence: 99%

Mean Drift Wave Forces on Arrays of Bodies Surrounded by Thin Porous Surfaces

Konispoliatis

Mavrakos

2023

JMSE

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A semi-analytical solution is presented for the evaluation of mean drift wave forces on arrays of structures composed of impermeable vertical cylindrical bodies and surrounded by thin, porous surfaces. The porous cell is assumed to have fine pores so that a linear pressure drop can be considered. The mean drift wave forces on the array are determined via two principally different approaches: the momentum conservation theory and the direct integration of all pressure contributions upon the bodies’ instantaneous wetted surfaces. A solution method that solves the corresponding diffraction problem following the multiple scattering approach is proposed to account for the hydrodynamic interaction phenomena between the waves and the bodies. Numerical results are presented which illustrate the consistency of each of the two approaches in accurately evaluating the mean wave drift forces on several examined array configurations. It is shown that the thin, porous surface significantly reduces the drift forces on the array of bodies, whereas at specific wave frequencies, local enhancements of the forces’ values are noted due to the amplified wave field between the members of the array.

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Section: Introductionmentioning

confidence: 99%

Mean Drift Wave Forces on Arrays of Bodies Surrounded by Thin Porous Surfaces

Konispoliatis

Mavrakos

2023

JMSE

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“…Reference [25] studied the interaction between 92 oblique waves and a finite moored submerged horizontal 93 flexible membrane on wave dissipation using the matched 94 eigenfunction expansion method (MEFEM), which may be 95 helpful for a coastal engineer to understand the performance of submerged flexible porous membrane for designing a submerged breakwater. Reference [26] further finished numerical research on wave-blocking performance of the composite breakwater of a submerged horizontal flexible porous membrane with a lower rubble mound, in which the porouseffect parameter, spatial distribution of structures, and spring stiffness to wave-blocking performance are discussed. The numerical result shows that the composite structure has better performance than the single porous membrane and the submerged rubble mound breakwaters in both the short and long wave regimes.…”

Section: Introductionmentioning

confidence: 99%

A Model Coupling CFD and DRL: Investigation on Wave Dissipation by Actively Controlled Flat Plate

et al. 2022

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In order to protect structures along the offshore and off the coast, breakwaters are commonly applied to reduce the influence of waves. Flat plate breakwater is studied frequently due to its great performance near the water surface, however, traditional passive methods such as fixed and floating flat plate breakwaters usually fail to give full play of effective wave dissipation when encountering variable unknown incoming waves. Therefore, this paper develops an interdisciplinary model coupling computational fluid dynamics (CFD) and deep reinforcement learning (DRL) to study the wave dissipation of a submerged movable flat plate breakwater against regular waves. An in-house numerical wave tank (NWT) is built to simulate the fluid-structure interaction between the plate and regular waves. The fluid domain in NWT is regarded as environment while the flat plate breakwater is agent. In addition, the wave dissipation strategy is learned by the artificial neural network (ANN) through the continuous wave-plate interaction. It is excited to find that the coupling model is able to learn the control strategies automatically and exhibits good adaptability to the changes of environment. 13 14 INDEX TERMS Wave dissipation, deep reinforcement learning, flat plate breakwater, active controlling, CFD and DRL. culated, of which the results showed that a suitable geo-49 metrical porosity of the upper plate leads to a low level of 50 uplift wave forces on both plates. Reference [17] investi-51 gated the flow field passing over a submerged horizontal 52 flat plate by means of a free surface potential flow model, 53 a form discretized by the Boundary Element Method (BEM), 54 from which the wave dissipation mechanism of a plate-55 type breakwater and the influence of plate thickness, length 56 and submergence was concluded. Reference [18] presented 57 an integrated CFD+CSM approach to fully simulate the 58 hydroelastic interaction between nonlinear ocean waves and 59 a deformable SHPB device, making two major contributions: 60 (a) the research work demonstrated a valid computer-aided 61 approach that can perform hydroelastic offshore and coastal 62 designs; (b) the researching work demonstrated a hydroelastic 63 design methodology for breakwaters for the first time and 64 showed that the deformation of the structure has a significant 65 effect on the wave-damping performance. References [19] 66 and [20] conducted an experiment to research the wave dissi-67 pation performance of a twin-plate considering various wave 68 conditions. References [21] and [22] investigated the interac-69 tion between freak waves based on numerically investigating 70 the interaction characteristics of horizontal deck structures 71 and freak waves, which revealed the corresponding phenom-72 ena, wave loads, and structural response. Reference [23] 73 further studied the interaction between Peregrine breather-74 based freak waves and twin-plate breakwaters, including the 75 characteristics of interaction phenomena, transmitted wave 76 surface, wave loads, and st...

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“…An oblique wave interaction with a horizontal flexible porous membrane was investigated by applying the eigenfunction expansion method to analyse the wave energy dissipation of a porous membrane application to breakwater [34]. Further, a new composite breakwater of a submerged horizontal flexible porous membrane with a lower rubble mound was developed under the eigenfunction matching technique in [35].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Effect of Currents on the Dynamics of a Moored Flexible Cylindrical Net Cage

Liu

Mohapatra

Soares

2021

JMSE

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A numerical model associated with wave–current interactions with a moored flexible cylindrical cage was developed based on the finite element method. An analytical model was formulated under the linearised wave theory and small structural response, and a semi-analytical solution was obtained using the Fourier Bessel series solution and least squares approximation method, along with a matching technique. The numerical results from the finite element analysis of the horizontal displacements for different design parameters under a uniform current were compared with the analytical model solutions. It was seen that they had a good level of agreement with their results. The effects of different current speeds and time on the cage shapes were analysed from the finite element results. Further, the mooring forces on the flexible cage for different values of the cage height and cage radius were also presented. The comparison of the results indicated that the numerical model results could be used with confidence in the design of a flexible cylindrical net cage for applications to offshore aquacultures.

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Composite breakwater of a submerged horizontal flexible porous membrane with a lower rubble mound

Cited by 15 publications

References 33 publications

Mean Drift Wave Forces on Arrays of Bodies Surrounded by Thin Porous Surfaces

Mean Drift Wave Forces on Arrays of Bodies Surrounded by Thin Porous Surfaces

A Model Coupling CFD and DRL: Investigation on Wave Dissipation by Actively Controlled Flat Plate

Finite Element Analysis of the Effect of Currents on the Dynamics of a Moored Flexible Cylindrical Net Cage

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