Numerical analysis of the motion and load responses of a 400,000 DWT ore carrier in waves

Abstract

The need to benefit from economy of scale has driven the design of larger and larger ships with increasing tonnage. The hull structures of large ships are more flexible and the natural frequencies of the hull girder can even fall within the range of wave encounter frequencies resulting in the resonance phenomenon termed springing. A numerical linear hydroelastic investigation of the wave induced motion and load responses of a 400,000 dead weight tonnage (DWT) ore carrier is carried out in this work using an in-house program: Linear Elastic Compass Wave Loads Calculation System (WALCS-LE). The full load condition at different ship speeds, wave lengths and incident wave headings in regular waves is investigated. Long term predictions are also made. It is imperative to account for springing loads and the probable extreme motions and loads at the design stage of large ships to ensure their endurance and safety at sea.