ABSTRACT:

Liquid sloshing will be excited in a partially filled tank mounted on the board when a liquid cargo is in the sea. On the other hand it will affect the ship motions. This paper focuses on the ship motions in waves with consideration of coupled effects with liquid sloshing. A threedimensional panel method in time-domain is applied to solve the ship motion problem, and liquid sloshing is calculated by CFD technique simultaneously.

INTRODUCTION

Sloshing flow in ship tanks is excited by ship motions, but it affects the ship motions in reverse. The coupled effect is important in prediction of the ship motions and the impulsive force on the wall of the sloshing tank. For some ships, such as LNG vessels, the local impulsive load is critical in ship structural safety design. Studies on the coupling problem have been introduced a few decades ago. Most studies were based on the linear frequency-domain theory (Malenica, Zalar, Chen, 2003; Zalar, 2007; Kim, Yung, 2008) or model experiments (Medeiros, 2008; Nasar, 2008; Nam, Kim, 2009). Recently, elasticity was taken in consideration (Lee, Tan, Temarel, Miao, 2010) and many time-domain analyses for this coupling problem have been published (Kim, Shin, 2003; Kim, 2001; Kim, Nam, 2006; Kim, Nam, 2007; Mitra, Wang, Reddy, Khoo, 2012). In addition, the interaction of sloshing and ship collisions is also in research (Tabri, Matusiak, Varsta, 2009). In this paper, a time-domain approach is applied for the coupling problem. In order to solve the coupling problem, ship motions and sloshing of tanks are solved at the same time. A three-dimensional panel method in time-domain is applied to solve the ship motion problem and the sloshing problem of the tanks are solved by a commercial CFD software (FLUENT) based on the predicted tank motion simultaneously.

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