Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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A Study on Estimation of the Course Keeping Ability of a Ship in Confined Waterways Using the MMG Model

MMG 모델을 이용한 제한수로를 운항하는 선박의 침로안정성능 추정에 관한 연구

  • Kim, Hyunchul (Yellow Sea Transportation System Research Center, Inha University) ;
  • Kim, In-Tae (Graduate School of Naval Architecture & Ocean Engineering, Inha University) ;
  • Kim, Sanghyun (Department of Naval Architecture & Ocean Engineering, Inha University) ;
  • Kwon, Soo Yeon (Korea Maritime Transportation Safety Authority)
  • 김현철 (인하대학교 황해권수송시스템연구센터) ;
  • 김인태 (인하대학교 조선해양공학과 대학원) ;
  • 김상현 (인하대학교 조선해양공학과) ;
  • 권수연 (한국해양교통안전공단)
  • Received : 2019.09.23
  • Accepted : 2019.11.27
  • Published : 2019.12.31
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Abstract

Ship hydrodynamics in the confined waterways is challenging. When a ship is maneuvering in confined waterways, the hydrodynamic behavior may vary significantly because of the hydrodynamic interaction between the bottom of the ship hull and the seabed, or so-called shallow water effects. Thus, an accurate prediction of shallow water and bank effects is essential to minimizing the risk of the collision and the grounding of the ships. The hydrodynamic derivatives measured by the virtual captive model test provide a path to predicting the change in ship maneuverability. This paper presents a numerical simulation of captive model tests to predict the maneuverability of a ship in confined waterways. Also, straight and zig-zag simulation were conducted to predict the trajectory of a ship maneuvering in confined waterways. The results showed that the asymmetric flow around a ship induced by vicinity of banks causes pressure differences between the port and starboard sides and the trajectory of a ship maneuvering in confined waterways.

선박이 제한수로를 운항할 때에는 기존 심수 및 천수 중을 운항하는 선박의 조종특성과 일반적으로 다르기 때문에 선박의 안전한 항해를 위해 달라지는 선박의 조종특성 추정이 중요하다. 본 연구에서는 제한수로를 운항하는 선박의 조종성능을 추정하기 위해 조종운동 방정식과 가상 구속모형시험 시뮬레이션을 통한 유체력 미계수를 이용하여 조종성능을 추정하였다. 조종 수학 모델 중 선체, 프로펠러, 타를 분리하여 유체력을 모델링하는 방식인 모듈형(modular type) 모델에 제한수로의 영향을 고려하는 항을 추가하여 제한수로 중 조종성능을 추정 연구를 수행하였다. 제한수로 중 선체에 작용하는 유체력 미계수를 도출하기 위하여 상용 CFD 프로그램을 이용한 가상 구속모형시험 시뮬레이션을 수행하였다. 최종적으로 제한수로 중 직진 시뮬레이션과 Zig-zag 시뮬레이션을 수행하여 제한수로의 영향이 고려된 조종 시뮬레이션을 수행하였다. 특히 선박의 침로 안정성능을 평가하기 위해 Zig-zag 시험을 수행하는데, 측벽으로 인한 선박 주위의 비대칭 유동이 좌현과 우현에 압력차이를 발생시켜 선박의 궤적에 큰 영향을 미침을 확인하였다.

Keywords

References

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