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Numerical modeling of a spar platform tethered by a mooring cable

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Abstract

Virtual simulation is an economical and efficient method in mechanical system design. Numerical modeling of a spar platform, tethered by a mooring cable with a spherical joint is developed for the dynamic simulation of the floating structure in ocean. The geometry modeling of the spar is created using finite element methods. The submerged part of the spar bears the buoyancy, hydrodynamic drag force, and effect of the added mass and Froude-Krylov force. Strip theory is used to sum up the forces acting on the elements. The geometry modeling of the cable is established based on the lumped-mass-and-spring modeling through which the cable is divided into 10 elements. A new element-fixed local frame is used, which is created by the element orientation vector and relative velocity of the fluid, to express the loads acting on the cable. The bottom of the cable is fixed on the seabed by spring forces, while the top of the cable is connected to the bottom of the spar platform by a modified spherical joint. This system suffers the propagating wave and current in the X-direction and the linear wave theory is applied for setting of the propagating wave. Based on the numerical modeling, the displacement-load relationships are analyzed, and the simulation results of the numerical modeling are compared with those by the commercial simulation code, ProteusDS. The comparison indicates that the numerical modeling of the spar platform tethered by a mooring cable is well developed, which provides an instruction for the optimization of a floating structure tethered by a mooring cable system.

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Authors and Affiliations

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

    Xiangqian Zhu & Wan-Suk Yoo

Authors
  1. Xiangqian Zhu
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  2. Wan-Suk Yoo
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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, Korea. He received his master degree from Pusan National University, South 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 the director at NRL (National Research Laboratory) of Computer Aided Engineering, Pusan National University, 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 spar platform tethered by a mooring cable. Chin. J. Mech. Eng. 28, 785–792 (2015). https://doi.org/10.3901/CJME.2015.0206.054

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  • DOI: https://doi.org/10.3901/CJME.2015.0206.054

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