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

The Society of Naval Architects of Korea (대한조선학회)
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Analysis of Large-Amplitude Ship Motions Using a Cartesian-Gridbased Computational Method

직교격자 기반 수치기법을 이용한 선박의 대변위 운동해석

  • Yang, Kyung-Kyu (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Nam, Bo-Woo (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Lee, Jae-Hoon (Department of Naval Architecture and Ocean Engineering, Seoul National University) ;
  • Kim, Yonghwan (Department of Naval Architecture and Ocean Engineering, Seoul National University)
  • 양경규 (서울대학교 조선해양공학과) ;
  • 남보우 (서울대학교 조선해양공학과) ;
  • 이재훈 (서울대학교 조선해양공학과) ;
  • 김용환 (서울대학교 조선해양공학과)
  • Received : 2012.07.27
  • Accepted : 2012.11.12
  • Published : 2012.12.20
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Abstract

In this study, a Cartesian-grid method based on finite volume approach is applied to simulate the ship motions in large amplitude waves. Fractional step method is applied for pressure-velocity coupling and TVD limiter is used to interpolate the cell face value for the discretization of convective term. Water, air, and solid phases are identified by using the concept of volume-fraction function for each phase. In order to capture the interface between air and water, the tangent of hyperbola for interface capturing (THINC) scheme is used with weighed line interface calculation (WLIC) method which considers multidimensional information. The volume fraction of solid body embedded in the Cartesian grid system is calculated using a level-set based algorithm, and the body boundary condition is imposed by a volume weighted formula. Numerical simulations for the two-dimensional barge type model and Wigley hull in linear waves have been carried out to validate the newly developed code. To demonstrate the applicability for highly nonlinear wave-body interactions such as green water on the deck, numerical analysis on the large-amplitude motion of S175 containership is conducted and all computational results are compared with experimental data.

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References

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