Capsizing

About: Capsizing is a research topic. Over the lifetime, 491 publications have been published within this topic receiving 3745 citations. The topic is also known as: keeling over & capsize.

Beyond the border: clandestine migration journeys

Abstract: The world has turned its attention to the long and dangerous journeys undertaken by migrants.1 Not a week goes by without media reports of migrant boats capsizing in the Mediterranean and corpses w...

Application of global methods for analyzing dynamical systems to ship rolling motion and capsizing

Abstract: Ship capsizing is a highly nonlinear dynamic phenomenon where global system behavior is dominant. However the industry standards for analysis are limited to linear dynamics or nonlinear statics. Until recently, most nonlinear dynamic analysis relied upon perturbation methods which are severely restricted both with respect to the relative size of the nonlinearity and the region of consideration in the phase space (i.e., they are usually restricted to a small local region about a single equilibrium), or on numerical studies of idealized system models. In this work, recently developed global analysis techniques (e.g., those found in Guckenheimer and Holmes [1986], and Wiggins [1988, 1990]) are used to study transient rolling motions of a small ship which is subjected to a periodic wave excitation. This analysis is based on determining criteria which can predict the qualitative nature of the invariant manifolds which represent the boundary between safe and unsafe initial conditions, and how these depend on system parameters for a specific ship model. Of particular interest is the transition which this boundary makes from regular to fractal, implying a loss in predictability of the ship’s eventual state. In this paper, actual ship data is used in the development of the model and the effects of various ship and wave parameters on this transition are investigated. Finally, lobe dynamics are used to demonstrate how unpredictable capsizing can occur.

Computational ship hydrodynamics: Nowadays and way forward

Abstract: Computational fluid dynamics for ship hydrodynamics has made monumental progress over the last ten years, which is reaching the milestone of providing first-generation simulation-based design tools with vast capabilities for model- and full-scale simulations and optimization. This is due to the enabling technologies such as free surface tracking/capturing, turbulence modeling, 6 degree of freedom (DoF) motion prediction, dynamic overset grids, local/adaptive grid refinement, high performance computing, environmental modeling and optimization methods. Herein, various modeling, numerical methods, and high performance computing approaches for computational ship hydrodynamics are evaluated thereby providing a vision for the development of the next-generation high-fidelity simulation tools. Verification and validation procedures and their applications, including resistance and propulsion, seakeeping, maneuvering, and stability and capsizing, are reviewed. Issues, opportunities, and challenges for advancements in higher-fidelity two-phase flow are addressed. Fundamental studies for two-phase flows are also discussed. Conclusions and future directions are also provided.

The simulation of ship motions and capsizing in severe seas

Abstract: A numerical model has been developed to determine the large amplitude motions of a steered vessel subjected to severe wave conditions, including those that may lead to capsizing. The aim was to numerically identify different modes of capsizing that had been observed experimentally, and to study the mechanisms and conditions that could lead to capsizing. The various force components that occur in the large amplitude equations of motion were examined, and an analysis was carried out to determine the sensitivity of the roll response to changes in those components. Particular attention is paid to the ship behavior and its simulation in irregular following and quartering seas