Numerical Simulation of In-Line Response of a Vertical Cylinder in Regular Waves
Numerical Simulation of In-Line Response of a Vertical Cylinder in Regular Waves
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DOI：
10.2112/jcoastres-d-13-00052.1
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Yi Han;J. Zhan;W. Su;Y. Li;Quan Zhou
中科院分区：
文献类型：
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作者：
Yi Han;J. Zhan;W. Su;Y. Li;Quan Zhou
摘要韩勇；詹俊明；苏伟；李永生，周春春，2015。规则波中垂直圆柱体顺列响应的数值模拟。用数值模拟的方法研究了柔性安装的竖直圆柱体在一系列规则波中的顺列响应。采用动态网格格式和层流模型。比较了五种波片的实验时程和模拟时程以及圆柱体的响应。在低入射波频率下，虽然柱体直径与波长的比值很小，但振动柱体对流场的影响很小。圆柱体的数值响应与实验数据吻合较好。随着入射波频率的增加，圆柱体的绕射效应变得明显，圆柱体的模拟响应略弱于实验值。当入射波频率接近圆柱体的固有频率时，圆柱体发生共振振荡，对流场影响较大。圆柱体后面的波高降低了。在高入射波频率下，雷诺数增大，圆柱体的数值响应变得比实验值更强。总而言之，气缸响应的数值计算结果与实验模型的结果吻合较好。为了提高数值模式的预测精度，今后应该进行进一步的研究，例如使用湍流模型。
ABSTRACT Han, Y.; Zhan, J-M.; Su, W.; Li, Y.S., and Zhou, Q. 2015. Numerical simulation of in-line response of a vertical cylinder in regular waves. In-line response of a flexibly mounted, vertical cylinder in a series of regular waves was studied with numerical simulation. A dynamic mesh scheme and a laminar flow model were adopted. The experimental and simulated time histories of five wave gages and the response of the cylinder were compared. At low-incident wave frequencies, although the ratios of the diameters of the cylinders to the wavelength were small, the oscillating cylinder had little influence on the flow field. The numerical responses of the cylinder were in very good agreement with the experimental data. As the frequency of the incoming wave increased, the diffraction effect caused by the cylinder became significant, and the simulated responses of the cylinder were slightly weaker than those of experiment. When the incident wave frequency approached the natural frequency of the cylinder, the cylinder oscillated in resonance, and the flow field was strongly influenced. The wave height behind the cylinder was reduced. At high-incident wave frequencies, the Reynolds number increased, and the numerical response of the cylinder became stronger than those of experiment. In conclusion, the numerical results of the cylinder response agreed well with the results of the experimental model. To improve the predictive accuracy of the numerical model, further study, such as with the use of a turbulence model, should be carried out in the future.