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Numerical modeling of a spherical buoy moored by a cable in three dimensions

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Abstract

Floating facilities have been studied based on the static analysis of mooring cables over the past decades. To analyze the floating system of a spherical buoy moored by a cable with a higher accuracy than before, the dynamics of the cables are considered in the construction of the numerical modeling. The cable modeling is established based on a new element frame through which the hydrodynamic loads are expressed efficiently. The accuracy of the cable modeling is verified with an experiment that is conducted by a catenary chain moving in a water tank. In addition, the modeling of a spherical buoy is established with respect to a spherical coordinate in three dimensions, which can suffers the gravity, the variable buoyancy and Froude-Krylov loads. Finally, the numerical modeling for the system of a spherical buoy moored by a cable is established, and a virtual simulation is proceeded with the X- and Y-directional linear waves and the X-directional current. The comparison with the commercial simulation code ProteusDS indicates that the system is accurately analyzed by the numerical modeling. The tensions within the cable, the motions of the system, and the relationship between the motions and waves are illustrated according to the defined sea state. The dynamics of the cables should be considered in analyzing the floating system of a spherical buoy moored by a cable.

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Authors and Affiliations

  1. Computer Aided Engineering Laboratory, School of Mechanical Engineering, Pusan National University, Busan, 609735, Republic of Korea

    Xiangqian Zhu & Wan-Suk Yoo

Authors
  1. Xiangqian Zhu
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  2. Wan-Suk Yoo
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Corresponding author

Correspondence to Wan-Suk Yoo.

Additional information

Supported by Human Resources Development Program of Korea Institute of Energy Technology Evaluation and Planning(KETEP), Ministry of Trade, Industry and Energy of Korea(Grant No. 20134030200290)

ZHU Xiangqian, born in 1987, is currently a PhD candidate at Computer Aided Engineering Laboratory, Pusan National University, Republic of Korea. He received his master degree from Pusan National University, Korea, in 2010. His research interests include dynamics of flexible multibody system, ocean engineering, and numerical modeling of floating platform.

YOO Wan-Suk, born in 1954, is currently a professor and a director at NRL(National Research Laboratory) of Computer Aided Engineering, Pusan National University, Republic of Korea. His main research interests include dynamics of flexible multibody system, vehicle dynamics, dynamics simulation and application.

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Zhu, X., Yoo, WS. Numerical modeling of a spherical buoy moored by a cable in three dimensions. Chin. J. Mech. Eng. 29, 588–597 (2016). https://doi.org/10.3901/CJME.2016.0204.021

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  • DOI: https://doi.org/10.3901/CJME.2016.0204.021

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