Flow Separation and Vortex Dynamics in Waves Propagating over A Submerged Quartercircular Breakwater

被引：8
|
作者：
Jiang Xue-lian [1 ,2 ]
Yang Tian [1 ]
Zou Qing-ping [3 ]
Gu Han-bin [4 ]
机构：
[1] Tianjin Chengjian Univ, Tianjin Key Lab Soft Soil Characterist & Engn Env, Tianjin 300384, Peoples R China
[2] Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China
[3] Heriot Watt Univ, Inst Infrastruct & Environm, Lyell Ctr Earth & Marine Sci & Technol, Edinburgh EH14 4AS, Midlothian, Scotland
[4] Zhejiang Ocean Univ, Sch Naval Architecture & Mech Elect Engn, Zhoushan 316022, Peoples R China
来源：
CHINA OCEAN ENGINEERING | 2018年 / 32卷 / 05期
基金：
中国国家自然科学基金;
关键词：
submerged quartercircular breakwater; cnoidal wave; flow separation; vortex dynamics; scour; QUARTER CIRCULAR BREAKWATER; WATER-WAVES; SOLITARY WAVE; RECTANGULAR OBSTACLE; NUMERICAL-SIMULATION; SEMICIRCULAR BREAKWATERS; IRREGULAR WAVES; SURF ZONE; PART I; GENERATION;
D O I：
10.1007/s13344-018-0054-5
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The interactions of cnoidal waves with a submerged quartercircular breakwater are investigated by a Reynolds-Averaged Navier-Stokes (RANS) flow solver with a Volume of Fluid (VOF) surface capturing scheme (RANS-VOF) model. The vertical variation of the instantaneous velocity indicates that flow separation occurs at the boundary layer near the breakwater. The temporal evolution of the velocity and vorticity fields demonstrates vortex generation and shedding around the submerged quartercircular breakwater due to the flow separation. An empirical relationship between the vortex intensity and a few hydrodynamic parameters is proposed based on parametric analysis. In addition, the instantaneous and time-averaged vorticity fields reveal a pair of vortices of opposite signs at the breakwater which are expected to have significant effect on sediment entrainment, suspension, and transportation, therefore, scour on the leeside of the breakwater.
引用
收藏
页码：514 / 523
页数：10
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