Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Study on the Hydrodynamic Performance of High-Speed Vessel with Trim Tab Using Full-Scale CFD Simulation

실선 스케일 CFD 해석 기반 트림 탭이 부착된 고속선의 유체동역학적 성능 분석

  • Lee, Jonghyeon (Shipbuilding & Marine Simulation Center, Tongmyong University) ;
  • Park, Dong-Woo (School of Naval Architecture & Ocean Engineering, Tongmyong University)
  • 이종현 (동명대학교 조선해양시뮬레이션센터) ;
  • 박동우 (동명대학교 조선해양공학부)
  • Received : 2021.06.22
  • Accepted : 2021.08.27
  • Published : 2021.08.31
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Abstract

In this study, trim tabs were attached to end of stern hull of a small high-speed vessel of length approximately 10 m and Froude number 1.0 to improve resistance performance and passenger comfort. Before computational fluid dynamics (CFD) simulations to assess the performance according to various geometries of the trim tab, the scale effect had been found through a previous study, so full-scale simulations were performed. The trim tab chord length was set to 0.5 %, 1.0 % and 1.5 % of LPP, and its angle to base line was varied in intervals of 5°. It decreased trim by stern and flotation: the greater the angle and length, the greater was the effect. Then it had pressure resistance decreased and shear resistance increased, and reduction ratio of total resistance varied accordingly. The results of this study indicated that the resistance performance was improved about 27 % at optimal running attitude that was the trim by stern about 1.5°.

본 연구에서는 Froude 수 1.0, 길이 약 10 m 급 소형 고속선의 저항성능과 승선감을 향상시키기 위해 선미 끝단에 트림 탭을 부착하여 항주자세를 제어하였고, 트림 탭의 제원에 따른 성능을 확인하기 위해 CFD 해석을 수행하였다. 먼저 선행 연구로부터 수치해석이 수행되는 스케일에 따라 결과에 차이가 있는 것이 확인되었고, 이를 피하고자 실선 스케일에서의 해석을 수행하였다. 부착된 트림 탭의 코드 길이는 LPP의 0.5, 1.0, 1.5 %였으며, 선저 면과의 각도는 5° 간격으로 변화를 주었다. 트림 탭은 선박의 선미트림과 부상량을 감소시키는 효과가 있었으며, 이 효과는 트림 탭의 선저 면과의 각도가 클수록, 코드 길이가 길수록 증가하였다. 이로 인해 압력저항은 감소하고 전단저항은 증가하였으며, 두 성분의 변화량에 따라 전 저항 저감율이 결정되었다. 결과로부터 대상 선박의 최적 항주자세는 약 1.5°의 선미트림으로 특정되었고, 이때 저항성능은 약 27 % 개선되었다.

Keywords

Acknowledgement

이 연구는 2019학년도 동명대학교 교내학술연구비 지원을 받아 수행되었습니다(2019A021).

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