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| Interaction of oblique waves with an array of long horizontal circular cylinders | |
| 作者姓名： | NG Chiu-On |
| 作者单位： | Department of |
| 基金项目： | 国家重点基础研究发展计划(973计划);国家高技术研究发展计划(863计划);香港研究资助局资助项目 |
| 摘 要： | The scattering and radiations of linear oblique waves by multiple long horizontal circular cylinders submerged in water of finite depth are investigated using the multipole expansion method. Analytical expressions for the diffracted and radiated potentials are given as a linear combination of infinite multipoles. The unknown coefficients in the expressions are determined by using the addition theorem of the Bessel function and the cylinder boundary conditions. Also analytical expressions for wave forces, hydrodynamic coefficients and reflection and transmission coeffi-cients are derived. The present analytical solution is verified through the boundary element method and applied to investigate three different cases of the interaction of oblique waves with multiple submerged horizontal circular cylinders. The results show that the number of cylinders, the arrangement and spacing between cylinders play an important role in wave forces, hydrodynamic coefficients and reflection and transmission coefficients. Some interesting and important phenomena are ob-served in numerical experiments. |
| 收稿时间： | 16 August 2006 |
| 修稿时间： | 14 November 2006 |
Interaction of oblique waves with an array of long horizontal circular cylinders |
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| NG Chiu-On.Interaction of oblique waves with an array of long horizontal circular cylinders[J].Science in China(Technological Sciences),2007,50(4):490-509. | |
| Authors: | Shen YongMing Zheng YongHong Ng Chiu-On |
| Affiliation: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China 2. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China 3. Department of Mechanical Engineering, the University of Hong Kong, Pokfulam Road, Hong Kong, China |
| Abstract: | The scattering and radiations of linear oblique waves by multiple long horizontal circular cylinders submerged in water of finite depth are investigated using the multipole expansion method. Analytical expressions for the diffracted and radiated potentials are given as a linear combination of infinite multipoles. The unknown coefficients in the expressions are determined by using the addition theorem of the Bessel function and the cylinder boundary conditions. Also analytical expressions for wave forces, hydrodynamic coefficients and reflection and transmission coeffi-cients are derived. The present analytical solution is verified through the boundary element method and applied to investigate three different cases of the interaction of oblique waves with multiple submerged horizontal circular cylinders. The results show that the number of cylinders, the arrangement and spacing between cylinders play an important role in wave forces, hydrodynamic coefficients and reflection and transmission coefficients. Some interesting and important phenomena are ob-served in numerical experiments. |
| Keywords: | scattering and radiation water waves analytical technique hydrodynamic characteristics |
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