方形人工鱼礁局部冲刷的数值模拟

IF 1.3 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Mingda Yang, Yanli Tang, Fenfang Zhao, Shiji Xu, Guangjie Fang
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引用次数: 0

摘要

摘要人工鱼礁是近海渔业资源恢复和生态环境恢复的关键人工设施之一。然而,许多ar由于冲刷而失去了稳定性和功能。为了保证AR的功能效果,研究不同流动条件下冲刷引起的埋地等导致AR不稳定的因素具有重要意义。本文在FLOW-3D中建立了一个三维数值模型,研究了稳流条件下AR周围的局部冲刷特性。采用重整化群(RNG) k - ε湍流模型,建立了雷诺数平均Navier-Stokes (RANS)方程,模拟了一个AR周围的稳定流场,并将模拟结果与已有的实验结果进行了比较,结果吻合较好。研究了开口数和入射角对射流冲刷特性、平衡冲刷深度和最大冲刷体积的影响。结果表明:随着开孔数的增加,冲刷深度和冲刷体积减小;在此基础上,根据数值计算结果,提出了AR开孔数对平衡冲刷深度和最大冲刷体积影响的经验方程。入射角的变化会影响坝体最上游角的床层剪应力,床层剪应力越大,冲刷越剧烈。通过本研究,为ar优化工程设计和施工提供理论支持和实践指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Simulation of Local Scour Around a Square Artificial Reef
Abstract Artificial reefs (ARs) are one of the key anthropogenic constructs used to restore offshore fishery resources and recover the ecological environment. However, many ARs lose their stability and function due to scour. To ensure the functional effect of ARs, it is of great significance to study the factors causing AR instability, such as burying caused by scour under different flow conditions. In present study, a three-dimensional numerical model is established in FLOW-3D to study the local scour characteristics around an AR in steady currents. Reynolds-averaged Navier–Stokes (RANS) equations, closed with the renormalization group (RNG) k–ɛ turbulence model, are established to simulate a stable flow field around one AR. The simulation results are compared with previous experimental results, exhibiting good agreement. The effects of the opening number and the incident angles of ARs on the scour characteristics, equilibrium scour depth, and maximum scour volume were also investigated. The results indicate that the scour depth and scour volume decreased as the opening number increased. Furthermore, empirical equations are proposed herein based on the numerical results derived for the effects of the AR opening number on the equilibrium scour depth and maximum scour volume. A change in the incident angle affected the bed shear stress at the most-upstream corner of the AR. The greater the bed shear stress was, the more intense the scour was. In this study, we provide theoretical support and practical guidance for the optimized engineering design and construction of ARs.
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来源期刊
CiteScore
4.20
自引率
6.20%
发文量
63
审稿时长
6-12 weeks
期刊介绍: The Journal of Offshore Mechanics and Arctic Engineering is an international resource for original peer-reviewed research that advances the state of knowledge on all aspects of analysis, design, and technology development in ocean, offshore, arctic, and related fields. Its main goals are to provide a forum for timely and in-depth exchanges of scientific and technical information among researchers and engineers. It emphasizes fundamental research and development studies as well as review articles that offer either retrospective perspectives on well-established topics or exposures to innovative or novel developments. Case histories are not encouraged. The journal also documents significant developments in related fields and major accomplishments of renowned scientists by programming themed issues to record such events. Scope: Offshore Mechanics, Drilling Technology, Fixed and Floating Production Systems; Ocean Engineering, Hydrodynamics, and Ship Motions; Ocean Climate Statistics, Storms, Extremes, and Hurricanes; Structural Mechanics; Safety, Reliability, Risk Assessment, and Uncertainty Quantification; Riser Mechanics, Cable and Mooring Dynamics, Pipeline and Subsea Technology; Materials Engineering, Fatigue, Fracture, Welding Technology, Non-destructive Testing, Inspection Technologies, Corrosion Protection and Control; Fluid-structure Interaction, Computational Fluid Dynamics, Flow and Vortex-Induced Vibrations; Marine and Offshore Geotechnics, Soil Mechanics, Soil-pipeline Interaction; Ocean Renewable Energy; Ocean Space Utilization and Aquaculture Engineering; Petroleum Technology; Polar and Arctic Science and Technology, Ice Mechanics, Arctic Drilling and Exploration, Arctic Structures, Ice-structure and Ship Interaction, Permafrost Engineering, Arctic and Thermal Design.
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