Microscopic investigation of shape effect on local scour around the monopile using CFD-DEM

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Geotechnics Pub Date : 2024-11-03 DOI:10.1016/j.compgeo.2024.106872
Dong Li , Ziying Zheng , Zheng Hu , Huihuan Ma
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Abstract

Local scour refers to the erosion or migration of sedimental particles around bridge piers or abutments under the action of water flow. It can potentially undermine the hydraulic structures, resulting in catastrophic damage or even collapse. Under various hydraulic conditions, monopiles with diverse cross-sectional shapes have increasingly been applied to marine foundations. This study aims to investigate the effect of monopile shapes on scour development, and to establish a cross-scale connection between the macroscopic evolution of scour pits and the microscopic characteristics of sediments. The scour processes around monopiles are simulated using a coupled computational fluid dynamics and discrete element method (CFD-DEM). Four monopile shapes are examined, including circular, square, square with rounded corners, and diamond. Macroscopic characteristics such as seabed morphology, maximum scouring depth, and scour areas are analyzed, along with the microscopic characteristics such as the kinetic energy, drag force, and mechanical coordination number. The outcomes highlight that the diamond-shaped pile results in the greatest scour depth and widest scour areas compared to the other shapes. The incorporation of rounded pile corners improves flow characteristics and mitigate scour pit development. Furthermore, the local scour at different areas around the monopiles varies under the influence of different flow features.
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利用 CFD-DEM 对单桩周围局部冲刷的形状效应进行微观研究
局部冲刷是指在水流作用下,桥墩或桥台周围的沉积颗粒被侵蚀或迁移。它有可能破坏水力结构,造成灾难性的破坏甚至坍塌。在各种水力条件下,截面形状各异的单桩越来越多地应用于海洋地基。本研究旨在探讨单桩形状对冲刷发展的影响,并建立冲刷坑宏观演变与沉积物微观特征之间的跨尺度联系。采用计算流体动力学和离散元耦合方法(CFD-DEM)模拟了单桩周围的冲刷过程。研究了四种单桩形状,包括圆形、方形、带圆角的方形和菱形。分析了海底形态、最大冲刷深度和冲刷面积等宏观特征,以及动能、阻力和机械配合数等微观特征。结果表明,与其他形状的桩相比,菱形桩的冲刷深度最大,冲刷面积最广。圆角桩的加入改善了水流特性,减缓了冲刷坑的形成。此外,在不同水流特征的影响下,单桩周围不同区域的局部冲刷也各不相同。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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