期刊
JOURNAL OF HYDRODYNAMICS
卷 33, 期 1, 页码 111-119出版社
SPRINGER
DOI: 10.1007/s42241-021-0005-0
关键词
Large woody debris (LWD) transport; floating objects; drag and side force coefficients; vertical blockage; free-surface interaction
类别
资金
- Centre for International Cooperation and Development of the University of Pavia (CICOPS)
The study calculated drag and side force coefficients of a half-submerged cylinder in free-surface flow through numerical simulations, investigating their variability with yaw angle and flow depth versus cylinder diameter ratio. The simulations were validated by comparison with laboratory experiments, and further extended to conditions with significant vertical blockage, revealing detailed flow features near the cylinder for different cases. The results could be applicable beyond log transport, encompassing any scenario of a floating cylinder interacting with free-surface flow.
The drag and side force coefficients of a half-submerged cylinder in a free-surface flow were calculated through numerical simulations, with the aim of supporting the numerical modelling of log transport in rivers. The variability of these coefficients with the yaw angle with respect to the flow direction and with the ratio between the flow depth and the diameter of the cylinder were investigated. Simulations were performed with the three-dimensional code ANSYS/CFX, employing the volume of fluid multiphase technique to reproduce the critical interaction between the free surface and the cylinder. The numerical tests, showing the rise of the drag force coefficient for increasing yaw angles passing from flow-parallel to flow-perpendicular cylinder and the peak of the side force coefficient for flow-oblique cylinder, were validated by comparison with the results of laboratory experiments. The simulations were then extended to conditions with significant blockage in the vertical direction which had not been previously experimented, revealing a strong increase in the force coefficients for decreasing ratios between the flow depth and the cylinder diameter. A detailed description of the reproduced flow features in the proximity of the cylinder for the different cases was furthermore obtained. Such report, in addition to the analysis of the force coefficients, could serve a much wider range than that of log transport, i.e., any case in which a floating cylinder interacts with free-surface flow.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据