基于REEF3D的网格周围流体力学数值模拟

Gang Wang, T. Martin, Liu-yi Huang, H. Bihs
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引用次数: 0

摘要

网眼周围的流体力学和湍流与海洋养鱼场结构受力和安全问题密切相关,越来越受到人们的关注。在网上受力的数值模拟中,通常采用morrison或筛网力模型来解释网的流体力学。然而,这些方法主要依赖于经验实验或圆柱形流体动力系数,忽略了相邻十字形或网杆之间的流动相互作用。本研究采用REEF3D开源流体力学工具箱,对网格绕流进行显式分析,研究与结构受力相关的流体力学。模拟结果与水槽试验及前人研究结果吻合较好。研究了网杆和网节周围的流速和涡量。结果表明,2 × 2或3 × 3网格情况在研究网格周围的湍流、相邻网格周围的流动相互作用和结时更为可靠。控制Sn的两种方式,一种是改变网条直径,另一种是控制长度,对绕网流量有不同的影响。本文提出了第一步,目的是推导出一个新的基于Sn和Re的Cd经验公式,这与海上条件下的物理特性更相关。
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 Hydrodynamics Around Net Meshes Using REEF3D
Hydrodynamics and turbulence around net meshes have drawn more and more attention because it is closely related to forces on the structures and safety issues of offshore fish farms. In terms of numerical modeling of forces on nets, Morison or screen force model is ordinarily adopted to account for its hydrodynamics. However, these methodologies mainly rely on empirical experimental or cylindrical hydrodynamic coefficients, neglecting flow interactions between adjacent cruciforms or net bars. In this study, REEF3D open-source hydrodynamic toolbox is adopted to analyze flow around net meshes explicitly and investigate the hydrodynamics related to forces on the structure. The simulation accuracy is in good agreement with flume experiments and previous research. Flow velocity and vorticity around net bars and knots are investigated. The results demonstrate that 2 × 2 or 3 × 3 mesh cases are more reliable when studying turbulence around net meshes, flow interactions around adjacent net bars, knots should be taken into consideration. Two patterns to control Sn, one is to change the diameter of net bars and the other is to control length, have different effects on the flow around meshes. This paper presents a first step in the aim to derive a new empirical formula for Cd depending on Sn, and Re, which are more related to the physics in offshore conditions.
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