Abstract
Accurate prediction of ship seakeeping performance in complex ocean environment is a fundamental requirement for ship design and actual operation in seaways. In this paper, an unsteady Reynolds-averaged Navier–Stokes (RANS) computational fluid dynamics (CFD) solver with overset grid technique was applied to estimate the seakeeping performance of an S175 containership operating in bi-directional cross waves. The cross wave is reproduced by linear superposition of two orthogonal regular waves in a rectangle numerical wave tank. The ship nonlinear motion responses, bow slamming loads, and green water on deck induced by cross wave with different control parameters such as wave length and wave heading angle are systemically analyzed. The results demonstrate that both vertical and transverse motion responses, as well as slamming pressure of ship induced by cross wave, can be quite large, and they are quite different from those in regular wave. Therefore, ship navigational safety when suffering cross waves should be further concerned.
Highlights
The majority of existing ship seakeeping investigations are concerned with ship motion behavior in uni-directional or long-crested waves [1]
This paper focuses on investigating ship seakeeping behavior in bi-directional cross progressive waves by the computational fluid dynamics (CFD) method, which will provide some insights into ship motion behavior in multi-directional waves
A cross progressive wave is simulated in a rectangular numerical wave tank, and corresponding ship hydrodynamic behavior are estimated by solving Unsteady Reynolds Averaged Navier–Stokes (URANS) equations
Summary
The majority of existing ship seakeeping investigations are concerned with ship motion behavior in uni-directional or long-crested waves [1]. Wang et al [17] calculated the wave forces on a large cylinder in multi-directional irregular waves using a CFD tool These works focus on the simulation of multi-directional wave and provide some foundations for the research of ship seakeeping behavior in multi-directional waves using CFD. This paper focuses on investigating ship seakeeping behavior in bi-directional cross progressive waves by the CFD method, which will provide some insights into ship motion behavior in multi-directional waves. For this purpose, a cross progressive wave is simulated in a rectangular numerical wave tank, and corresponding ship hydrodynamic behavior are estimated by solving Unsteady Reynolds Averaged Navier–Stokes (URANS) equations.
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