Experimental and numerical investigation of a surface-fixed horizontal porous wave barrier

IF 0.7 Q4 ENGINEERING, OCEAN

Ocean Systems Engineering-An International Journal Pub Date : 2021-03-01 DOI:10.12989/OSE.2021.11.1.001

Sunny Kumar Poguluri, Jeongrok Kim, Arun George, I. Cho

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引用次数: 2

Abstract

Experimental and numerical investigations were conducted to study the performance of a surface-fixed horizontal porous wave barrier in regular waves. The characteristics of the reflection and transmission coefficients, energy dissipation, and vertical wave force were examined versus different porosities of the barrier. Numerical simulations based on 3D Reynolds Averaged Navier-Stokes equations with standard low-Re k-e turbulent closure and volume of fluid approach were accomplished and compared with the experimental results conducted in a 2D wave tank. Experimental measurements and numerical simulations were shown to be in satisfactory agreement. The qualitative wave behavior propagating over a horizontal porous barrier such as wave run-up, wave breaking, air entrapment, jet flow, and vortex generation was reproduced by CFD computation. Through the discrete harmonic decomposition of the vertical wave force on a wave barrier, the nonlinear characteristics were revealed quantitatively. It was concluded that the surface-fixed horizontal barrier is more effective in dissipating wave energy in the short wave period region and more energy conversion was observed from the first harmonic to higher harmonics with the increase of porosity. The present numerical approach will provide a predictive tool for an accurate and efficient design of the surface-fixed horizontal porous wave barrier.

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表面固定水平多孔波障的实验与数值研究

通过实验和数值研究，研究了表面固定水平多孔波浪屏障在规则波浪中的性能。对比不同孔隙率的屏障，研究了反射系数和透射系数、能量耗散和垂直波浪力的特性。基于标准低Rek-e的三维雷诺平均Navier-Stokes方程的数值模拟 实现了湍流闭合和流体体积法，并与在二维波浪水槽中进行的实验结果进行了比较。实验测量和数值模拟结果一致。通过CFD计算再现了在水平多孔屏障上传播的定性波浪行为，如波浪上升、波浪破碎、空气截留、射流和涡流产生。通过对波浪屏障上垂直波浪力的离散谐波分解，定量揭示了其非线性特性。结果表明，表面固定的水平屏障在短波周期区域更有效地耗散波浪能量，并且随着孔隙率的增加，观察到更多的能量从一次谐波转换为高次谐波。本数值方法将为表面固定的水平多孔波浪屏障的精确和有效设计提供一种预测工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ocean Systems Engineering-An International Journal ENGINEERING, OCEAN-

自引率

22.20%

发文量

期刊介绍： The OCEAN SYSTEMS ENGINEERING focuses on the new research and development efforts to advance the understanding of sciences and technologies in ocean systems engineering. The main subject of the journal is the multi-disciplinary engineering of ocean systems. Areas covered by the journal include; * Undersea technologies: AUVs, submersible robot, manned/unmanned submersibles, remotely operated underwater vehicle, sensors, instrumentation, measurement, and ocean observing systems; * Ocean systems technologies: ocean structures and structural systems, design and production, ocean process and plant, fatigue, fracture, reliability and risk analysis, dynamics of ocean structure system, probabilistic dynamics analysis, fluid-structure interaction, ship motion and mooring system, and port engineering; * Ocean hydrodynamics and ocean renewable energy, wave mechanics, buoyancy and stability, sloshing, slamming, and seakeeping; * Multi-physics based engineering analysis, design and testing: underwater explosions and their effects on ocean vehicle systems, equipments, and surface ships, survivability and vulnerability, shock, impact and vibration; * Modeling and simulations; * Underwater acoustics technologies.