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基于大涡模拟与被动示踪物模型的人工鱼礁数值研究
王者也, 李 爽
浙江大学海洋学院 舟山
摘要:
投放人工鱼礁是解决海洋生态环境问题的重要措施之一。本文通过使用并行大涡模拟模式(The Parallelized Large-Eddy Simulation Model, PALM)及被动示踪物模型模块,研究了不同背景流速条件(0.1m/s 、0.2 m/s、0.4m/s 和0.6m/s)下方型人工鱼礁对流场形态、营养盐的抬升作用、湍流动能收支的影响。此次研究表明,鱼礁的存在使得其附近垂向速度增大,产生上升流。受到上升流的抬升作用,鱼礁底部的示踪物迅速进入海洋上层,而后遇到鱼礁后方的背涡流,示踪物的抬升受阻,高度逐渐降低。在上升流区域以及背涡流区域的共同影响下,示踪物抬升区域的最大高度与来流流速无关。不同上升流定义对应的上升流区域的高度与来流流速均不相关;上升流区域的最大速度、平均速度与来流流速都成线性增加的关系;然而随着来流流速的增大,上升流区域面积的变化趋势却完全不同。投放鱼礁后,鱼礁区域底部的混合增强,同时湍流剪切项与耗散项显著增大。湍流传输项的分布显示区域底部的能量被输运至上层,这说明,鱼礁的存在不仅对营养物质具有抬升作用,还能将能量向上输运。
关键词:  大涡模拟  人工鱼礁  被动示踪物  湍流动能收支
DOI:10.11693/hyhz20210300075
分类号:
基金项目:国家自然科学基金项目, 41876003号; 国家重点研发计划项目, 2017YFA0604102号
NUMERICAL RESEARCH ON CUBIC ARTIFICIAL REEF BASED ON LARGE EDDY SIMULATION AND PASSIVE SCALAR MODEL
Wang Zhe-Ye, LI Shuang
Ocean College,Zhejiang University,Zhoushan,China
Abstract:
Artificial reef is a widely used tool for marine ecosystem improvement. This study uses the Parallel Large Eddy Simulation Model (PALM) and its passive scalar mode to explore the effects of solid cubic artificial reef on flow field , turbulence kinetic energy budget and nutrient uplift under four inflow velocities (0.1m/s 、0.2 m/s、0.4m/s 和0.6m/s). It shows that artificial reef can significantly increase the vertical speed near the reef and force the inflow upward and boost the upwelling. The scalar at the bottom of reef, due to the uplifting effect of upwelling, quickly enters the oceanic surface but then goes down owing to impeded uplifting effect when the scalar encounters vortex at the back of reef. Under the joint effects of the regions of upwelling and vortex, the maximum height of the lifting region of passive scalar is no related correlation to inflow velocities. While there are different definitions of upwelling, the heights of upwelling, obtained by these different definitions, all show no correlation with upwelling. Both the average velocities and the maximum upwelling velocities of upwelling region increase linearly with inflow velocities, however, the area of upwelling region changes in a totally different trend. After placing the reef, the mixing of the bottom of the region become strengthened, meanwhile, the dissipative term and shear production are remarkably enlarged. The distribution of transport term can transport the energy of the bottom of the region. This means the reef can take the energy upward, in addition uplifting the nutrient.
Key words:  large eddy simulation  artificial reef  passive scalar  TKE budget
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