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

The Society of Naval Architects of Korea (대한조선학회)
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Ice Floe-induced Ship Resistances using Explicit Finite Element Analyses with a User-subroutine

사용자-서브루틴과 양해법 유한 요소 해석을 이용한 선박의 유빙 저항 추정

  • Han, Donghwa (Dept. of Naval Architecture & Ocean Engineering, Inha University) ;
  • Paik, Kwang-Jun (Dept. of Naval Architecture & Ocean Engineering, Inha University) ;
  • Jeong, Seong-Yeop (Korea Research Institute of Ships & Ocean Engineering (KRISO)) ;
  • Choung, Joonmo (Dept. of Naval Architecture & Ocean Engineering, Inha University)
  • 한동화 (인하대학교 조선해양공학과) ;
  • 백광준 (인하대학교 조선해양공학과) ;
  • 정성엽 (선박해양플랜트연구소) ;
  • 정준모 (인하대학교 조선해양공학과)
  • Received : 2019.12.24
  • Accepted : 2020.02.11
  • Published : 2020.04.20
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Abstract

There have been many attempts to predict resistance of vessels in ice floe environment, but they mostly have both strong and weak points at the same time; for instance, simplified formulas are very fast but less flexible to types of ship and ice conditions and other numerical techniques need high computing cost for increased accuracy. A new numerical simulation technique of combining explicit finite element analysis code with a user-subroutine to control real-time forces acting on ice floes was proposed, thereby it was possible to predict ship-to-ice floe resistance with higher convenience and accuracy than other proposed approaches. The basic theory on how real-time hydrostatic and hydrodynamic forces acting on ice floes could be generated using user-subroutine was explained. The heave motion of a single ice floe was simulated using the user-subroutine and the motion amplitudes and periods were almost consistent with analytic values. Towing tests of an icebreaker model ship were simulated using explicit finite element analyses with the user-subroutine. The ice-induced resistance obtained from the towing experiments and simulations showed significant differences. Intentional increase of the drag coefficient to increase the contact duration between the ice floes and rigid model ship leaded the total resistance to be substantially consistent between the model tests and numerical simulations.

Keywords

References

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