Ship Motions and Added Resistance in Oblique Waves

Research Project, 2017 – 2022

Modern ship hulls having a pronounced bow flare and wide flat transom sterns introduce wave loads that cannot be handled accurately by traditional methods. A new generation of computational methods to predict the exciting wave forces, ship motions and added resistance in waves is therefore needed.  The most advanced methods available today (CFD) are very time consuming which limits their use in practical design work. A method that overcomes these limitations was presented in a PhD work at Chalmers University of technology (Kjellberg 2013). The method fills a gap between traditional methods and the most advanced methods, but it was developed and validated for ships in head seas only.

In the proposed project the method will be extended to handle oblique seas and coupled ship motions in 6 degrees of freedom. Due to the fully nonlinear representation of the free surface and the geometry, the proposed method is expected to give more accurate predictions of added resistance, motions, accelerations, synchronous and parametric roll as well as structural loads compared to traditional methods.