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

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Flow and Structural Response Characteristics of a Box-type Artificial Reef

상자형 어초의 흐름 및 구조응답 특성

  • Kim, Dongha (Department of Ocean Engineering, Pukyong National University) ;
  • Woo, Jinho (Department of Ocean Engineering, Pukyong National University) ;
  • Na, Won-Bae (Department of Ocean Engineering, Pukyong National University) ;
  • Yoon, Han-Sam (Research Center for Ocean Industry and Development, Pukyong National University)
  • 김동하 (부경대학교 해양공학과) ;
  • 우진호 (부경대학교 해양공학과) ;
  • 나원배 (부경대학교 해양공학과) ;
  • 윤한삼 (부경대학교 해양산업개발연구소)
  • Received : 2013.12.13
  • Accepted : 2014.05.20
  • Published : 2014.06.30
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Abstract

We carried out flow and structural response analysis of a box-type artificial reef (AR), which is made of concrete and structural steel. From the flow analysis, the wake region and drag coefficient were evaluated and accordingly, the structural analysis was performed to evaluate the stress and deformation of the target reef by considering the pressure field obtained from the flow analysis. The concept of wake volume was presented to quantitatively estimate the wake region and its variation according to flow direction and velocity. From the results, it is shown that the flow responses are only sensitive to the flow direction; the structural responses are sensitive to both of the flow velocity and direction although the magnitudes are negligible; and the wake volume became 3.52 times the AR volume with an optimum installation condition ($30^{\circ}$, flow direction) of the target unit.

콘크리트와 강재로 제작된 상자형 어초의 흐름응답과 구조응답 수치해석을 수행하였다. 흐름해석으로부터 대상 어초의 후류역과 항력계수를 평가하였으며 압력장을 외력으로 재하하여 구조해석을 수행하고 대상어초의 응력과 변형을 평가하였다. 후류역 평가를 위하여 후류체적 개념을 도입하였고 이로부터 유향과 유속에 따른 후류역의 변동을 정량적으로 제시하였다. 해석결과로부터 흐름응답은 유향에 지배적인 영향을 받으나 유속과는 무관하며 구조응답은 유향과 유속에 영향을 받지만 그 크기가 매우 작고, 단일어초의 최적 설치 조건(유향 $30^{\circ}$)에서 대상어초의 후류체적은 공용적의 3.52배임을 알 수 있었다.

Keywords

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