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Structural Engineering and Mechanics Volume 68, Number 1, October10 2018 , pages 1-15 DOI: https://doi.org/10.12989/sem.2018.68.1.001 |
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Hydrodynamic analysis of floating structures with baffled ARTs |
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San Kim and Kang-Heon Lee
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| Abstract | ||
| In ocean industry, free surface type ART (Anti Roll tank) system has been widely used to suppress the roll motion of floating structures. In those, various obstacles have been devised to obtain the sufficient damping and to enhance the controllability of freely rushing water inside the tank. Most of previous researches have paid on the development of simple mathematical formula for coupled ship-ARTs analysis although other numerical and experimental approaches exist. Little attention has been focused on the use of 3D panel method for preliminary design of free surface type ART despite its advantages in computational time and general capacity for hydrodynamic damping estimation. This study aims at developing a potential theory based hydrodynamic code for the analysis of floating structure with baffled ARTs. The sloshing in baffled tanks is modeled through the linear potential theory with FE discretization and it coupled with hydrodynamic equations of floating structures discretized by BEM and FEM, resulting in direct coupled FE-BE formulation. The general capacity of proposed formulation is emphasized through the coupled hydrodynamic analysis of floating structure and sloshing inside baffled ARTs. In addition, the numerical methods for natural sloshing frequency tuning and estimation of hydrodynamic damping ratio of liquid sloshing in baffled tanks undergoing wave exiting loads are developed through the proposed formulation. In numerical examples, effects of natural frequency tuning and baffle ratios on the maximum and significant roll motions are investigated. | ||
| Key Words | ||
| anti roll tank; baffle; linear potential theory; hydrodynamic damping; hydrodynamic analysis; fluid-structure interaction | ||
| Address | ||
| San Kim: Department of Mechanical Engineering, Korean Advanced Institute for Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea Kang-Heon Lee: Korea Atomic Energy Research Institute, 111 Daehak-ro 989 beon-gil, Yuseong-gu, Daejeon 34057, Republic of Korea | ||