引用本文:武昕竹,柳淑学,李金宣.聚焦波浪与直立圆柱作用的数值模拟[J].水利水运工程学报,2015,(6):31-39
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聚焦波浪与直立圆柱作用的数值模拟
武昕竹1,2, 柳淑学1, 李金宣1
1.大连理工大学海岸与近海工程国家重点实验室,辽宁大连;2.白城兵器试验中心,吉林白城
摘要:
基于Fluent平台建立了可用于波浪传播模拟的数值计算水槽,利用不同波浪参数的线性规则波模拟分析了网格尺度L/Δx对产生波浪质量的影响,确定数值水槽的网格划分尺度,并验证了阻尼消波的有效性。在此基础上,用模拟频谱的方法对聚焦波浪的传播进行了数值模拟,通过数值模拟与物理试验不同位置处的聚焦波波面和聚焦点下水质点速度时间过程线对比,验证了模拟频谱方法数值计算的有效性。进一步对聚焦波浪与直立圆柱的作用进行了数值模拟,数值模拟聚焦波面过程、聚焦波浪水质点速度、圆柱周围波浪波动过程、圆柱上所受的波压力等,并与试验结果进行了对比,数值计算结果与试验结果吻合很好,验证了所建立的数值水槽的有效性。对聚焦波波面和压力特征值进行了误差分析,并分析了误差的产生原因,为进一步研究聚焦波浪与工程结构物的作用奠定基础。
关键词:  Fluent软件; 聚焦波浪; 直立圆柱  数值模拟
DOI:
分类号:TV139.2
基金项目:国家自然科学基金资助项目(51309050, 51221961);国家重点基础研究发展计划(973)资助项目(2013CB036101,2011CB013703)
Numerical simulation of interactions of focusing wave with a vertical cylinder
WU Xin-zhu1,2, LIU Shu-xue1, LI Jin-xuan1
1.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian;2.Baicheng Weapon Test Center, Baicheng
Abstract:
A numerical model used to simulate wave propagation was developed based on the Fluent software. Through simulating regular waves with different wave parameters, the relationships between the grid scale L/Δx and the quality of the simulated waves were analyzed. The grid scale for the numerical model was proposed according to the compared results, and the effectiveness of the damping absorber and the piston type wave making method were verified. On the basis of the numerical model, the focusing wave propagation was simulated by simulating wave spectrum. The simulated focusing wave time series and the water particle’s velocity under a focus point for 0.15 m were compared with the experimental results at different positions, and the effectiveness of the numerical model with the method for simulating wave spectrum was verified. Furthermore, the interaction between the focusing wave with a vertical cylinder was simulated. The numerical results including the focusing wave time series and water particle’s velocity time series under a focusing point for 0.15 m, the wave fluctuation time series around the cylinder, the point pressure time series on the cylinder and the cylinder’s positive total pressure time series were compared with the associated experimental results. The numerical simulation results were in good agreement with the experimental results. The comparison between the numerical and experimental results verified the effectiveness of the numerical model. At the end of this paper, in order to accumulate experience and lay a solid foundation for further research for interactions between the focusing wave and other forms of marine structures with the Fluent software’s platform, the error of the eigenvalues of the focusing wave height and the point pressure around the cylinder were calculated and causes of the error analyzed.
Key words:  fluent  focusing wave  vertical cylinder  numerical simulation
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