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Journal of Korean Society of Coastal and Ocean Engineers > Volume 30(6); 2018 > Article
J Korean Soc Coast Ocean Eng 2018;30(6): 253-262. doi: https://doi.org/10.9765/KSCOE.2018.30.6.253
해수소통구를 구비한 진동수주형 파력발전구조물 내 공기흐름과 구조물 주변에서 파랑특성에 관한 3차원수치해석(불규칙파의 경우)
이광호1, 이준형2, 정익한2, 김도삼3
1가톨릭관동대학교 에너지플랜트공학과
2한국해양대학교 대학원 토목환경공학과
3한국해양대학교 건설공학과
3-Dimensional Numerical Analysis of Air Flow inside OWC Type WEC Equipped with Channel of Seawater Exchange and Wave Characteristics around Its Structure (in Case of Irregular Waves)
Kwang Ho Lee1, Jun Hyeong Lee2, Ik Han Jeong2, Do Sam Kim3
1Dept. of Energy Plant Eng., Catholic Kwandong University
2Dept. of Civil and Environmental Eng., Graduate School, Korea Maritime and Ocean University
3Dept. of Civil Eng., Korea Maritime and Ocean Univ., 727 Taejong-ro, Yeongdo-ku, Busan 49112, Korea
Corresponding author: Do Sam Kim ,Tel: +82-51-410-4463, Fax: +82-51-403-0656, Email: kimds@kmou.ac.kr
Received: November 27, 2018;  Revised: December 10, 2018.  Accepted: December 18, 2018.
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ABSTRACT
Oscillating Water Column (OWC) Wave Energy Converters (WEC) harness electricity through a Power-Take-Off (PTO) system from the induced-airflow by seawater oscillating inside a chamber. In general, an air chamber with a relatively small cross-sectional area is required compared to seawater chamber to obtain high-velocity air in the PTO system, and in order to simulate an accurate air flow rate in the air chamber, a three-dimensional study is required. In this study, the dynamic response of OWC-WEC that is equipped with the channel of seawater exchange for the case of irregular waves has been numerically studied. The open source CFD software, OLAFLOW for the simulation of wave dynamics to the openFOAM and FOAM-extend communities, was used to simulate the interaction between the device and irregular waves. Based on the numerical simulation results, we discussed the fluctuation characteristics of three dimensional air flow in the air-chamber, wave deformation around the structure and the seawater flow inside the channel of seawater exchange. The numerical results the maximum air flow velocity in the air-chamber increases as the Ursell value of the significant wave increases, and the velocity of airflow flowing out from the inside of air chamber to the outside is greater than the speed of flowing into the air chamber from the outside.
Keywords: OWC-WEC, OLAFLOW, 3-Dimensional irregular waves, air flow, seawater flow, water level, Ursell number
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