Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Laminar Flow Structures Near a Circular Cylinder in between a Free-Surface and a Moving Wall

자유수면과 움직이는 벽면 사이에 놓인 원형 실린더 주위의 층류 유동구조

  • Seo, Jang-Hoon (Samsung Heavy Industry Co. Ltd.) ;
  • Jung, Jae-Hwan (Department of Naval Architecture and Ocean Engineering, Pusan University) ;
  • Yoon, Hyun-Sik (Global Core Research Center for Ships and Offshore Plants, Pusan University) ;
  • Park, Dong-Woo (Hyundai Heavy Industries Co. Ltd.) ;
  • Chun, Ho-Hwan (Department of Naval Architecture and Ocean Engineering, Pusan University)
  • 서장훈 (삼성중공업 조선해양연구소) ;
  • 정재환 (부산대학교 조선해양공학과) ;
  • 윤현식 (부산대학교 조선해양플랜트글로벌핵심연구센터) ;
  • 박동우 (현대중공업 선박해양연구소) ;
  • 전호환 (부산대학교 조선해양공학과)
  • Received : 2011.09.26
  • Accepted : 2012.04.25
  • Published : 2012.06.20
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Abstract

The present study numerically investigates the interaction between a free-surface and flow around a circular cylinder over a moving wall. In order to simulate the flow past the circular cylinder over a moving wall near a free-surface, this study has adopted the direct-forcing/fictitious domain (DF/FD) method with the level set method in the Cartesian coordinates. Numerical simulation is performed for a Reynolds numbers of 100 in the range of $0.25{\leq}g/D{\leq}2.00$ and $0.5{\leq}h/D{\leq}2.00$, where g/D and h/D are the gaps between the cylinder and a moving wall and the cylinder and a free-surface normalized by cylinder diameter D, respectively. According to g/D and h/D, the vortex structures have been classified into three patterns of the two-row, one-row, steady elongation. In general, both of g/D and h/D have the large values which mean the cylinder is far away from the wall and the free-surface, two-row vortex structure forms in the wake. When g/D decreases, the two-row vortex structure gradually transfers into the one-row vortex structure. When the g/D reveals the critical value below which the flow becomes steady state, resulting in the steady elongation vortex.

Keywords

References

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