An Investigation of Added Resistance of Ships in Oblique Seas

Abstract

Two approaches have been applied for numerical calculations of total added resistance both in regular and irregular long crested waves for Series 60 ships, parent form. In the first approach, total added resistance in regular waves has been determined by adding separately Maruo’s method for ship motion to that of Fujii-Takahashi’s method for wave reflection. In the second approach, Maru-Ishi’s method for ship motion has been added to that of Fuji-Takhashi’s method for wave reflection. Computed results have been compared with experimental ones in regular waves and other investigator in irregular waves. Average added resistance in a seaway is obtained from the analytically obtained mean response curve and the ISSC (International Ship and Offshore Structures Congress) spectrum applying linear superposition technique. Effects of speed, wave direction and block coefficients on added resistance have been examined and the percentage added resistance with respect to calm water resistance in different sea states h...