Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University ›› 2019, Vol. 53 ›› Issue (9): 1023-1029.doi: 10.16183/j.cnki.jsjtu.2019.09.002

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Bragg Reflection of Water Waves by Multiple Semicircular Structures Fixed on the Water Surface

DING Weiwei 1,ZOU Zaojian 1,2,WU Jingping 3   

  1. 1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 3. School of Transportation, Wuhan University of Technology, Wuhan 430063, China
  • Published:2019-10-11

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Abstract: Bragg reflection of water waves by multiple semicircular structures fixed on the water surface is investigated by using the boundary element method (BEM). It is based on the linear wave theory. In order to verify the correctness of BEM, the reflection coefficient of multiple semicircular structures fixed on the seabed is calculated. And the numerical results are compared with the theoretical results in literature. The effectiveness of the multiple semicircular structures fixed on the water surface in attenuating waves based on the principle of Bragg reflection is also proved. The effects of the number, the radius and the spacing of semicircular structures on the characteristics of Bragg reflection are investigated. The results of this study can provide a certain reference for the design of breakwater based on the principle of Bragg reflection.

Key words: Bragg reflection of water waves by multiple semicircular structures fixed on the water surface is investigated by using the boundary element method (BEM). It is based on the linear wave theory. In order to verify the correctness of BEM, the reflection coefficient of multiple semicircular structures fixed on the seabed is calculated. And the numerical results are compared with the theoretical results in literature. The effectiveness of the multiple semicircular structures fixed on the water surface in attenuating waves based on the principle of Bragg reflection is also proved. The effects of the number, the radius and the spacing of semicircular structures on the characteristics of Bragg reflection are investigated. The results of this study can provide a certain reference for the design of breakwater based on the principle of Bragg reflection.

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