Abstract
Understanding the motions of offshore structures, which are continuously affected by waves, is important. Thus, experimental approaches have traditionally been favored. However, computational methods are currently preferred because they reflect dynamic behavior more efficiently than experiments. The incompressible smoothed particle hydrodynamics was used in this study to model the waves and interactions with a buoy. Validation data for wave-structure interactions were obtained by using a wave tank. An incident sinusoidal wave was generated by a piston-type wave-maker, while a non-moored cylindrical buoy moved freely horizontally and vertically. Vertical motions must be predicted because the vertical motions of offshore structures considerably affect system performance. An IWD-IMU V1 sensor was used to measure buoy motion, and the vertical acceleration was compared with simulation data. The wave-structure interaction method considers the buoyancy force by the reference to the mass difference between a solid and a hollow buoy. Wave periods of 1.42, 1.58, 2.0, and 2.24 s were used. Buoy vertical acceleration was in increasingly good agreement with the experimental results as the wave period increased. This finding confirms that the proposed method predicts vertical buoy motion.
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Acknowledgments
This research was a part of the project titled “Development of fluid-multibody coupled analysis techniques for improving the performance of wave power generating system,” which was funded by the Ministry of Oceans and Fisheries, Korea.
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Chul Woong Jun is a Ph.D. of the Department of Mechanical Design Engineering at Pukyong National University, Busan, Korea. His interests include parallel computing, particle dynamics, and multibody system dynamics.
Jeong Hoon Shin is a graduate student of Mechanical Engineering at Pukyong National University, Busan, Korea. His research interests include vehicle dynamics and dynamic analysis of multibody systems.
Jeong Hyun Sohn is a Professor at the Department of Mechanical Design Engineering at Pukyong National University, Busan, Korea. His research interests include mechanism design and multibody system dynamics.
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Jun, CW., Shin, JH. & Sohn, JH. Incompressible SPH simulation and experimental validation of Buoy-Wave interaction. J Mech Sci Technol 34, 1475–1483 (2020). https://doi.org/10.1007/s12206-020-0309-y
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DOI: https://doi.org/10.1007/s12206-020-0309-y