Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Numerical Reproducibility of Wave Response for an Oscillating Wave Surge Converter Using Inverted Triangle Flap

역삼각형 플랩을 이용한 진자형 파력발전장치의 파랑응답에 대한 수치적 재현 가능성

  • Kim, Tag-Gyeom (SEIL ENGINEERING CO., LTD. Port & Coastal Development Institute) ;
  • Kim, Do-Sam (Dept. of Civil Engineering, Korea Maritime and Ocean University) ;
  • Cho, Yong-Hwan (Dept. of Civil Eng., Nagoya University) ;
  • Lee, Kwang-Ho (Dept. of Civil Engineering, Korea Maritime and Ocean University)
  • 김탁겸 ((주)세일종합기술공사 기술연구소) ;
  • 김도삼 (한국해양대학교 물류.환경.도시인프라공학부 건설공학전공) ;
  • 조용환 (일본나고야대학교 토목공학과) ;
  • 이광호 (한국해양대학교 물류.환경.도시인프라공학부 건설공학전공)
  • Received : 2021.10.06
  • Accepted : 2021.10.23
  • Published : 2021.10.31
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Abstract

Analyzing various wave interactions with oscillating wave surge converters (OWSC) is essential because they must be operated efficiently under a wide range of wave conditions and designed to extract optimal wave energy. In the conceptual design and development stage of OWSC, numerical analysis can be a good alternative as a design tool. This study performed a numerical analysis on the behavioral characteristics of the inverted triangle flap against the incident waves using open source CFD to examine the essential behavioral attributes of OWSC. Specifically, the behavioral characteristics of the structure were studied by calculating the free water surface displacement and the flap rotation angle near the inverted triangular flap according to the change of the period under the regular wave conditions. By comparing and examining the numerical analysis results with the hydraulic model experiments, the validity of the analysis performed and the applicability in analyzing the wave-structure interactions related to OWSC was verified. The numerical analysis result confirmed that the hydrodynamic behavior characteristic due to the interactions of the wave and the inverted triangle flap was well reproduced.

진자형 파력발전장치(Oscillating Wave Surge Converter, OWSC)는 다양한 유형의 파랑 조건에서 효율적으로 작동해야하며 최적의 파랑에너지를 추출하도록 설계되어야 하기 때문에 OWSC의 거동과 관련된 복잡한 파랑-구조물 상호작용이 광범위한 조건에서 검토되어야 한다. OWSC의 개념 설계 및 개발단계에서 수치해석은 OWSC의 설계도구로써 좋은 대안이 될 수 있다. 본 연구에서는 기초적인 OWSC의 거동특성에 대한 검토를 목적으로 오픈소스 CFD를 이용하여 내습하는 파랑에 대한 역삼각형 플랩의 거동특성에 대한 수치해석을 수행하였다. 규칙파 내습시 주기의 변화에 따른 역삼각형 플랩 인근의 자유수면변위 및 회전각도(Flap Rotation angle)를 산정하여 구조물의 거동 특성에 대해 고찰하고, 그 결과를 수리실험과 비교·검토하여 해석성능의 타당성 및 OWSC의 관련 문제를 수치적으로 해석하기 위한 수치모델로서의 적용성능을 검증하였다. 수치해석결과는 파랑과 역삼각형 플랩의 상호작용에 의한 유체역학적 거동 특성을 양호하게 재현함을 확인하였다.

Keywords

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