Water Wave Focusing Using Coordinate Transformation

作     者：Takahito Iida Masashi Kashiwagi 

作者机构：Department of Naval Architecture and Ocean Engineering Osaka University Osaka 5650871 Japan Research Fellow (DC1) of Japan Society for the Promotion of Science Osaka 5650871 Japan 

出 版 物：《Journal of Energy and Power Engineering》 (能源与动力工程（美国大卫英文）)

年 卷 期：2017年第11卷第10期

页      面：631-636页

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 080203[工学-机械设计及理论] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 

主　　题：Coordinate transformation wave focusing shallow water. 

摘      要：In this paper, wave focusing based on a coordinate transformation is proposed. It is known that the 2-dimensional wave equation which governs a shallow water problem in a potential theory can keep invariance under coordinate transformation. Once equivalent medium parameters are obtained so as to keep the invariance, wave rays can be arbitrarily designed. We show the design of equivalent medium for wave squeezing to focus waves on a specific domain. Numerical computations are carried out by a finite element based software COMSOL Multiphysics. Results show good agreement between predictions from the theory and computations. It can be applied for a wide range of frequency because the proposed method is able to be applied regardless of the frequency.