典型文献
Near-bed hydrodynamics associated with the entrainment of coarse particles at different protrusion heights
文献摘要：
This paper presents an investigation of near-bed hydrodynamics for a protruding coarse particle over a regular roughened bed. The laboratory experiments were undertaken at the threshold flow condition, which induced dislodgement of the protruding particle. Using different protrusion heights, the experimental results show that the protruding particle substantially changed the spatial distributions of time-averaged velocities, turbulent kinetic energy, and Reynolds shear stress when compared with those obtained from a flat rough bed. The spatial distribution pattern of the flow characteristics shows a reasonable degree of similarity at different protrusion heights examined in this study. Above the target particle, a zone of low Reynolds shear stress was observed. Quadrant analysis was conducted along the main flow direction, at an elevation close to the top of the target particle. A prevalence of sweep (Quadrant 4) and outwards interaction (Quadrant 1) events were associated with the dislodgement of the protruding particle. These findings imply that the drag force related to strong streamwise velocities may play a more significant role in protruding particle entrainment than the shear stress.
文献关键词：
中图分类号：
作者姓名：
Yushu Xie;Bruce W.Melville;Asaad Y.Shamseldin;Colin N.Whittaker;Yifan Yang
作者机构：
Department of Civil and Environmental Engineering,The University of Auckland,Auckland,New Zealand;School of Engineering,The University of Waikato,Hamilton,New Zealand
文献出处：
引用格式：
[1]Yushu Xie;Bruce W.Melville;Asaad Y.Shamseldin;Colin N.Whittaker;Yifan Yang-.Near-bed hydrodynamics associated with the entrainment of coarse particles at different protrusion heights)[J].水动力学研究与进展B辑,2022(06):1067-1080
A类：
dislodgement
B类：
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AB值：
0.560461
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