摘要
为了研究不同流线型潜体抛石基床上的波生紊流场结构,本文采用粒子图像测速技术获取了规则波作用下的瞬时速度场。周期平均速度场显示,迎浪区域的涡旋主要生成于波谷过程,在迎浪堤脚处形成一个小型周期时均环流系统,矩形潜体迎浪堤角附近还存在一个更强的周期时均环流。背浪区域的涡旋主要生成于波峰过程,形成一对周期时均反向环流,同时背浪基肩上存在一个紊流遮蔽区。矩形潜体的相平均涡旋更靠近堤背,弧形潜体和半圆潜体的相平均涡旋则大致水平向下游对流。上述结果表明,潜体对流场的干扰导致波面和速度场变得不对称,进而影响建筑物的局部冲淤和结构受力,而潜体的线型对背浪面涡旋的分布和传递有显著影响。
This paper presents the turbulent flow dynamics over the rubble mound generated by regular waves propagating over submerged rectangular,quarter-and semi-circular structures.Particle image velocimetry was used to measure the wave-induced instantaneous velocity fields.As shown in period-averaged velocity fields,the weatherside vortices are formed when wave troughs pass over immersed structures.A small period-averaged recirculation cell is formed at the weatherside toe.Moreover,a stronger period-averaged recirculation cell is developed in the vicinity of the weatherside corner of the rectangular structure than quarter-and semi-circular submerged structures.The leeside vortices are generated by the passing wave crests.A pair of counter-rotating recirculation cells are formed downstream while a shelter area from turbulent flow exists above the leeside berm.The evolution of phase-averaged vortices behind the rectangular structure is mainly confined to the vicinity of leeside wall while those behind the quarter-and semi-circular structures are advected horizontally further downstream.These observations indicate strong asymmetry of surface elevations and velocity fields due to the interference of immersed structure in the global advection of wave-induced flow.Consequently,the resulted asymmetric flow is expected to induce local scouring and pulsating pressures on immersed structures.It was also found that the geometry of immersed structure has a significant impact on the advection and dissipation of vortices.
作者
蒋学炼
赵悦
邹青萍
柳淑学
JIANG Xuelian;ZHAO Yue;ZOU Qingping;LIU Shuxue(Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China;State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 741852, China;The Lyell Centre for Earth and Marine Science and Technology, Institute for Infrastructure and Environment, Heriot-Watt University, Edinburgh, EH144AS, UK)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2021年第6期800-809,共10页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51509177)
天津市教委科研计划(2019ZD16,2019KJ108).
关键词
潜体
基床
规则波
粒子图像测速
紊流
速度场
涡量
环流
submerged breakwaters
foundation
regular waves
particle image velocimetry(PIV)
turbulence
velocity field
vorticity
circulation
