Prediction of the Propeller Performance During Ship Maneuvering

• Main Authors: Le-An Lin, 林立安
• Other Authors: Ching-Yeh Hsin
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/10126610251658458718

碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 101 === In this thesis, the influence of ship maneuvering to the propeller performance will be investigated through numerical simulations. The computations will be divided into two parts, and they are the computation of a ship in maneuvering, and the interactions between ships and propellers. In the present work, the numerical methods are first described. The viscous flow RANS method is used for the computations, and the propeller effects are simulated by the body force method. A moving coordinate system is used in the computations to save the computational time. The computations of a ship in drift angles without and with a propeller are first demonstrated. Though there are discrepancies between experimental data and computational results, the trend is predicted correctly. The computations of a ship in turning circle without and with a propeller are then demonstrated. The quasi-steady approach is more efficient than the unsteady approach; however, it is not applicable since the computational results are quite different from the unsteady results. The unsteady approach is used, and the results show that the propeller forces become stable as the ship in stable turning. Also the propeller forces in maneuvering are consistent with those from the open water test. In this thesis, the computations of ship maneuvering and propeller flow are integrated for the investigation of propeller performance in maneuvering. The presented numerical procedure can be further developed to establish the capability for completely predicting the ship maneuvering by CFD.