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Journal of Korean Society of Coastal and Ocean Engineers > Volume 31(3); 2019 > Article
J Korean Soc Coast Ocean Eng 2019;31(3): 170-179. doi: https://doi.org/10.9765/KSCOE.2019.31.3.170
내부유체 공진을 이용한 ‘Y’자 수로형 공명구조물내 파도응답 특성
김정록, 조일형
제주대학교 해양시스템공학과
Characteristics of Wave Response in a ‘Y’ Shape Water Channel Resonator Using Resonance of Internal Fluid
Jeongrok Kim, Il Hyoung Cho
Department of Ocean System Engineering, Jeju National University, 102 Jejudaehak-ro, Jeju-si, Jeju Special Self-Governing Province 63243, Korea
Corresponding author: Il Hyoung Cho ,Tel: +82-64-754-3482, Fax: +82-64-751-3480, Email: cho0904@jejunu.ac.kr
Received: April 3, 2019;  Revised: June 17, 2019.  Accepted: June 26, 2019.
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In this study, the wave responses in a ‘Y’shape water channel resonator for amplifying wave energy of a low density has been investigated. A water channel resonator is composed of the long channel and wave guider installed at the entrance. If the period of the incident waves coincides with the natural period of the fluid in a water channel resonator, resonance occurs and the internal fluid amplifies highly to a standing wave form. In order to analyze the wave response in a water channel resonator, we used the matched asymptotic expansion method and boundary element method. The both results were in good agreement with the results of the model test carried out in the two-dimensional wave tank of Jeju National University. Wave guider has an optimum length and installation angle according to the period of the incident wave, and especially effective in enhancing the amplification factor in a period range deviated from the resonance period. It is expected that the wave energy can be effectively extracted by placing the point absorber wave energy converter at the position of anti-node where the maximum wave height is formed by the internal fluid resonance.
Keywords: wave energy, water channel, wave guider, wave response, fluid resonance
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