한국해양공학회지 (Journal of Ocean Engineering and Technology)

  • 제36권1호
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  • Pages.21-31
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  • 2022
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  • 1225-0767(pISSN)
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  • 2287-6715(eISSN)
한국해양공학회 (Korean Society of Ocean Engineers)
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Numerical Analysis for Hydrodynamic Performance of OWC Devices with Multiple Chambers in Waves

  • Kim, Jeong-Seok (Research Institute of Marine Systems Engineering, Seoul National University) ;
  • Nam, Bo Woo (Department of Naval Architecture and Ocean Engineering, Seoul National University)
  • 투고 : 2021.11.25
  • 심사 : 2022.01.02
  • 발행 : 2022.02.28
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초록

In recent years, various studies have been conducted on oscillating-water-column-type wave energy converters (OWC-WECs) with multiple chambers with the objective of efficiently utilizing the limited space of offshore/onshore structures. In this study, a numerical investigation based on a numerical wave tank was conducted on single, dual, and triple OWC chambers to examine the hydrodynamic performances and the energy conversion characteristics of the multiple water columns. The boundary value problem with the Laplace equation was solved by using a numerical wave tank based on a finite element method. The validity of the current numerical method was confirmed by comparing it with the measured data in the previous experimental research. We undertook a series of numerical simulations and observed that the water column motion of sloshing mode in a single chamber can be changed into the piston motion of different phases in multiple OWC chambers. Therefore, the piston motion in the multiple chambers can generate considerable airflow at a specific resonant frequency. In addition, the division of the OWC chamber results in a reduction of the time-dependent variability of the final output power from the device. As a result, the application of the multiple chambers leads to an increase of the energy conversion performance as well as a decrease of the variability of the wave energy converter.

키워드

과제정보

This study is a part of the research conducted by the "Numerical Analysis Research on the Hydrodynamic Performance of Oscillating Water Column Wave Energy Converters Connected to Seawalls" project with the support of Seoul National University's Research Institute of Marine Systems Engineering, and we are grateful for the research funds provided for this project.

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