文章摘要
李珺,章守宇.米字型人工鱼礁流场数值模拟与水槽实验的比较[J].水产学报,2010,34(10):1587~1594
米字型人工鱼礁流场数值模拟与水槽实验的比较
The comparison between numerical simulation and water channel experiment on an Mizi artificial reef
投稿时间:2010-04-21  修订日期:2010-05-31
DOI:10.3724/SP.J.1231.2010.06934
中文关键词: 人工鱼礁  三维数值模拟  水槽实验
英文关键词: artificial reef  3D numerical simulation  water channel experiment
基金项目:国家“八六三”高技术研究发展计划重点项目(2006AAl00303);国家科技支撑计划(2007BAD43B03);上海市教委重点学科(J50702)
作者单位E-mail
李珺 上海海洋大学  
章守宇 上海海洋大学海洋学院 syzhang@shou.edu.cn 
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中文摘要:
      采用LES(大涡模拟)紊流模式,对定常来流速度下按实际尺寸缩小10倍的米字型人工鱼礁单体附近流场进行三维数值模拟,同时利用相同尺寸的水槽实验验证该数值计算方法的可行性。在数值模拟与水槽实验中分别设置了0.2、0.4、0.6、0.8、1.0以及1.2 m/s 6种来流速度,并比较礁体附近三个方向上流速变化的情况。结果表明,数值模拟中约80%的测点速度与水槽实验结果吻合。而且,具有较大差异的值都发生在礁体上方开口中心位置附近的测点,该位置流场变化强烈且水槽实验测量有一定难度,易产生误差,因此对比结果差异较大是可允许的。综合比较结果,初步认为利用三维数值模拟计算方法模拟人工鱼礁的流场变化是可行的,今后可利用该数值计算方法替代复杂的水槽实验,甚至可以对实际投放礁体的原始规格以及所放置的海域进行等比例模拟,更清晰准确地对人工鱼礁周围流场变化进行详细研究。同时对不同结构的人工鱼礁和人工鱼礁群周围的流场进行系统分析,从而实现人工鱼礁的优化配置。
英文摘要:
      The flow changing around the artificial reef is the fundament of its physical effect.So far,using 3D numerical calculation to study the flow around the artificial reef is a tentative research,so this paper compared the water channel experiment with the numerical calculation to prove its accuracy.Using the Large Eddy Simulation(LES),a method of Computational Fluid Dynamics,this paper simulated the flow around a Mizi type artificial reef(dimension compared with actual reef is 1∶10)under a steady initial coming flow.Also,the water channel experiment with the same size as the numerical model is set to prove the feasibility of the numerical simulation.This paper compared the flow from x,y and z,three directions,under six different velocities of the coming flow,0.2 m/s,0.4 m/s,0.6 m/s,0.8 m/s,1.0 m/s and 1.2 m/s.The result showed,about 80% of the velocity on the measured points by numerical simulation are consistent with the results measured by water channel experiment.Also,the discrepant points mainly located on the hatch of the top of the reef.And this position was difficult to measure because of the strong flow changing so that it was allowed to be variant.Therefore,under the overall comparison of results,this three dimensional numerical simulation can replace the water channel experiment and be applied in the simulation of the same size as the actual artificial reef in the sea area to do the further research of the flow around the artificial reefs more clearly.At the same time,we can use this method to build the artificial reef models to study the flow around the artificial reef with different structures or a set of some artificial reefs,then we can optimize the construction of artificial reefs.
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