Effectiveness of Bulbous rudder with Horizontal Fins on the Propulsion Performance of Ship in Waves

• HTAY Win Naing

  Department of Naval Architecture and Ocean Engineering, Osaka University

• MWANGI Benson Oyunge

  Department of Naval Architecture and Ocean Engineering, Osaka University

• MATSUURA Hina

  Department of Naval Architecture and Ocean Engineering, Osaka University

• TODA Yasuyuki

  Department of Naval Architecture and Ocean Engineering, Osaka University

Abstract

Over the years, shipping has been played on one of the most used transportation methods and marine trading is increasing more and more these days. As a result, the shipbuilders are trying to design and construct an efficient and enormous ship to be economical. On the other hand, the environmental awareness to eliminate greenhouse gas emission is rising due to the effect of global warming. Such factors make the various types of energy-saving devices (ESDs) to be developed reliably without affecting other functions. This paper characterizes the performance of the rudder bulb-fins system (RBF) fixed behind the propeller in wave. In this study, the analysis of dynamics forces and velocity fields around the stern which are crucial in evaluating the performance of ESDs were implemented using CFDShip-Iowa V4.5. The effect of the ESD on ship’s motion was analyzed by performing motions analysis in various regular head waves. The computational results were validated with the experiments conducted in the towing tank of Osaka University. The calculations were done for three cases of rudder conditions: the ship without a rudder, the ship with conventional rudder, and the ship with RBF. The predicted results and measured data reveal that the currently designed RBF can diminish the hub vortex strength and improve the hull efficiency due to the increase of thrust and wake gain without any adverse conditions. It can be confirmed that the computational simulations predicted and followed the trend of experimentally measured data well.

Journal

• Journal of the Japan Society of Naval Architects and Ocean Engineers

  Journal of the Japan Society of Naval Architects and Ocean Engineers 34 (0), 29-36, 2021

  The Japan Society of Naval Architects and Ocean Engineers

Details

• CRID: 1390291767485079040
• NII Article ID: 130008164964
• NII Book ID: AA12057769
• DOI: 10.2534/jjasnaoe.34.29
• ISSN: 18811760
• ISSN: 18803717
• NDL BIB ID: 031993133
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I031993133
• Web Site: https://www.jstage.jst.go.jp/article/jjasnaoe/34/0/34_29/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed