Numerical Study on Unified Seakeeping and Maneuvering of a Russian Trawler in Wind and Waves

Abstract

The maneuvering performance of a ship on the actual sea is very different from that in calm water due to wave-induced motion. It is crucial to account for the ship's maneuverability in waves at the design stage. Numerous prior studies have investigated the maneuverability of ships in waves. According to the International Towing Tank Conference (ITTC) (ITTC, 2011), there are four methods of predicting the movements of a ship maneuvering in waves: experiments, two-time scale, unified theory, and contract for difference (CFD) methods.Yasukawa ( 2006) proposed a method of estimating the hydrodynamic force components, including added mass, wave damping, and wave excitation forces. In his study, the basic motion equations were divided into two groups, high-frequency induced motion problems, and low-frequency maneuvering problems.Yasukawa (2006, 2008) performed a free-running model test in regular waves using the SR108 container ship. The experiment was conducted with various wavelengths in head sea and beam sea conditions. Skejic and Faltinsen (2007, 2008) presented a seakeeping and maneuvering analysis of two ships. They focused on overtaking and replenishment maneuvers between two ships. Seo et al. (2011) applied linear and nonlinear ship motion analysis toanalyze ship-maneuvering performance in high-amplitude waves. The maneuvering performance of the S-175 container ship was discussed with regard to wave slope. Also, the wave drift force was calculated using the direct pressure integration method. Skejic (2013) presented a maneuvering simulation of ships in a seaway and discussed the significant role of unified maneuvering and seakeeping. Zhang et al.