Simulation-Based Analysis of Parametric Rolling in Head Sea Conditions

This paper focuses on a significant maritime challenge, investigating the dangerous phenomenon called parametric rolling in KRISO Container Ships (KCS) using advanced numerical methods. The publicly available data from KCS serves as a valuable benchmark for study. The study highlights the benefits of employing numerical simulations, which provide a cost-effective and controlled approach to understanding complex non-linear phenomena like parametric rolling. The research highlights how fine hull structure, pronounced bow flare and flat transom stern in Container Ships make them particularly vulnerable to this phenomenon. The study employs a time-domain nonlinear simulation tool (HydRA - Hydrodyanamics Response Amplitude) with six degrees of freedom to simulate the ship’s motion nearly accurately. The tool effectively integrates linear radiation and scattering forces from the frequency domain program while handling the non-linear aspects of incident, restoring, and inertial forces. Comprehensive testing of the simulation tool against the head sea (at zero speed) conditions contributing to parametric rolling confirms its close approximation of parametric roll behaviour. This thorough study notably advances the safety of container ships and their crews by offering a more profound comprehension of the complex dynamics associated with parametric rolling and the crucial elements that impact its occurrence. The knowledge derived from this research is vital in refining ship designs and establishing effective measures to mitigate the risks associated with parametric rolling.