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Applied Sciences
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Numerical Study on Wave Energy Converters
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Numerical Study on Wave Energy Converters

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Marine Science and Engineering".

Deadline for manuscript submissions: closed (20 July 2022) | Viewed by 8849

Special Issue Editor

Prof. Dr. Weoncheol Koo

E-Mail Website
Guest Editor
Department of Naval Architecture and Ocean Engineering, Inha University, Incheon 22212, Korea
Interests: hydrodynamics; floating body dynamics; numerical wave tank; wave energy converters; ocean renewable energies; ocean internal waves

Special Issue Information

Dear Colleagues,

To marine renewable energy experts and scientists,

Significant progress is being made in the development of ocean energy that can replace fossil fuels. Currently, various wave energy converters (WECs) have been proposed and tested, but large commercial facilities are not yet operational.

The aim of this Special Issue is to introduce various numerical analysis techniques and studies for WEC development and testing. This issue collects important scientific contributions on the most promising numerical techniques for performance analysis of WEC that are proposed and developed onshore and offshore.

Research papers related to numerical analysis for various WECs are welcomed. This includes but is not limited to fixed/floating oscillating water columns, point absorbers, overtopping, breakwater linkages, etc. Through this Special Issue, it will be possible to share advanced numerical analysis techniques among WEC researchers and greatly facilitate future cooperation.

Prof. Dr. Weoncheol Koo
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • wave energy converters
  • hydrodynamics
  • computational fluid dynamics
  • potential fluid
  • oscillating water column
  • point absorbers
  • power take-off
  • performance analysis

Published Papers (5 papers)

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Research

19 pages, 9500 KiB  
Article
Coupled Dynamic Analysis of a Bottom-Fixed Elastic Platform with Wave Energy Converters in Random Waves
by Sanghwan Heo, Weoncheol Koo and Moo-Hyun Kim
Appl. Sci. 2022, 12(15), 7915; https://doi.org/10.3390/app12157915 - 07 Aug 2022
Viewed by 1320
Abstract
A Wavestar-type Wave Energy Converter (WEC) on an elastic foundation structure was investigated using an author-developed coupled dynamic analysis computer program. The program included an elastic foundation structure composed of beam elements, a multi-body dynamics model of the entire system, a hydrodynamics model [...] Read more.
A Wavestar-type Wave Energy Converter (WEC) on an elastic foundation structure was investigated using an author-developed coupled dynamic analysis computer program. The program included an elastic foundation structure composed of beam elements, a multi-body dynamics model of the entire system, a hydrodynamics model of the dual-buoy, and fully coupled dynamics considering the interaction between the structure and WECs. The selected WEC models a heaving-point-absorber (HPA), one of the oscillating body systems which causes rotational motions of a connecting rod attached to the foundation structure. A rotational-damper-type hydraulic power take-off (PTO) system on the foundation structure produced electricity. The bottom-fixed foundation structure was modeled by three-dimensional beam elements, and the entire system, including HPA, was analyzed by multi-body dynamics. Random wave data at Buan, a nearshore region of Korea, collected by the Korea Meteorological Administration (KMA), was used as a demonstration study using the developed computer programs. Through the case study, the displacement and stress of the foundation structure were increased significantly by the dynamic coupling effects with the WECs, which underscores that the coupled dynamic analysis is essential for a reliable performance evaluation and the design of such a system. Full article
(This article belongs to the Special Issue Numerical Study on Wave Energy Converters)
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14 pages, 4715 KiB  
Article
Experimental Capture Width Ratio on Unit Module System of Hybrid Wave Energy Converter for Nearshore
by Min-Su Park, Seung-Heon Lee and Sang-Cheol Ko
Appl. Sci. 2022, 12(12), 5845; https://doi.org/10.3390/app12125845 - 08 Jun 2022
Cited by 1 | Viewed by 1663
Abstract
This study proposes a new hybrid wave energy converter composed of a horizontal cylinder and a swing plate to improve the capture width ratio. The horizontal cylinder generates electrical energy by using the potential energy of the incident wave, whereas the swing plate [...] Read more.
This study proposes a new hybrid wave energy converter composed of a horizontal cylinder and a swing plate to improve the capture width ratio. The horizontal cylinder generates electrical energy by using the potential energy of the incident wave, whereas the swing plate produces electrical energy by using the kinetic energy of the water particles. The converter can improve the capture width ratio of the wave energy by efficiently combining the energies generated by these two different sources. The power-generating performance of the proposed hybrid wave energy converter is evaluated experimentally through a hydraulic model test at a scale ratio of 0.3 in a two-dimensional wave tank using direct conversion by a dynamo PTO (Power Take-Off) system. The dynamic power-generation characteristics of the hybrid wave energy converter are analyzed with respect to the eventual regularity of the incident wave (regular and irregular wave conditions), and the data necessary for the design of the generator and control system are acquired. Full article
(This article belongs to the Special Issue Numerical Study on Wave Energy Converters)
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20 pages, 8210 KiB  
Article
Hydrodynamic Analysis of a Breakwater-Integrated Heaving-Buoy-Type Wave Energy Converter with an Optimal Artificial Damping Scheme
by Ho-Jin Jeong, Sung-Jae Kim and WeonCheol Koo
Appl. Sci. 2022, 12(7), 3401; https://doi.org/10.3390/app12073401 - 27 Mar 2022
Cited by 2 | Viewed by 1821
Abstract
A three-dimensional frequency-domain numerical wave tank (FR-NWT) based on the Rankine panel method was developed. An optimal artificial damping zone (ADZ) scheme was first applied to the FR-NWT to prevent reflection waves from the end walls. Parametric studies of ramp function shape with [...] Read more.
A three-dimensional frequency-domain numerical wave tank (FR-NWT) based on the Rankine panel method was developed. An optimal artificial damping zone (ADZ) scheme was first applied to the FR-NWT to prevent reflection waves from the end walls. Parametric studies of ramp function shape with artificial damping coefficients and damping zone length were conducted to find a proper damping scheme for the frequency domain program. Applying both the Sommerfeld radiation condition and the ADZ scheme to the frequency domain program can reduce the length of the ADZ to less than one wavelength. The FR-NWT developed by the authors was used to calculate the hydrodynamic response of a hemispherical-heaving buoy wave energy converter (WEC) integrated with a seawall-type breakwater of infinite length. A linear power take-off system was used to calculate power generation of the WEC. The global motion of the WEC combined with the breakwater was up to 1.85 times greater than that of the WEC without the breakwater. Moreover, the capture width ratio of the WEC increased approximately 3.67 times more than that of the WEC without the breakwater. Full article
(This article belongs to the Special Issue Numerical Study on Wave Energy Converters)
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15 pages, 5131 KiB  
Article
Hydrodynamic Investigation on a Land-Fixed OWC Wave Energy Device under Irregular Waves
by Zhimin Zhou, Song Ke, Rongquan Wang, Robert Mayon and Dezhi Ning
Appl. Sci. 2022, 12(6), 2855; https://doi.org/10.3390/app12062855 - 10 Mar 2022
Cited by 7 | Viewed by 1686
Abstract
The hydrodynamic response of a land-based oscillating water column (OWC) wave energy converter under various irregular wave conditions is investigated numerically. Based on the potential flow theory, a two-dimensional fully nonlinear numerical wave flume (NWF) is developed to model the hydrodynamic characteristics using [...] Read more.
The hydrodynamic response of a land-based oscillating water column (OWC) wave energy converter under various irregular wave conditions is investigated numerically. Based on the potential flow theory, a two-dimensional fully nonlinear numerical wave flume (NWF) is developed to model the hydrodynamic characteristics using the time-domain higher-order boundary element method (HOBEM). The inner-domain sources method and JONSWAP energy spectrum is used to generate the irregular incident waves, and a linear pneumatic model is used to determine the pneumatic pressure inside the chamber. The free surface elevations at the chamber centre and the oscillatory pneumatic pressures induced by the vertical motion of the water column are recorded. The influence of irregular waves on the hydrodynamic characteristics of the OWC device is carried out by comparison with the regular waves, and a number of significant wave heights and peak wave periods are considered. The hydrodynamic efficiency of the OWC device in irregular wave conditions is observed to be lower than that in regular waves for most wave frequencies, especially near the resonant frequency. Full article
(This article belongs to the Special Issue Numerical Study on Wave Energy Converters)
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16 pages, 9131 KiB  
Article
Computational Study on Rogue Wave and Its Application to a Floating Body
by Wooyoung Jeon, Sunho Park, Gyu-Mok Jeon and Jong-Chun Park
Appl. Sci. 2022, 12(6), 2853; https://doi.org/10.3390/app12062853 - 10 Mar 2022
Cited by 3 | Viewed by 1590
Abstract
A rogue wave is a huge wave that is generated by wave energy focusing. Rogue waves can cause critical damage to ships and offshore platforms due to their great wave energy and unpredictability. In this paper, to generate a rogue wave, a bull’s-eye [...] Read more.
A rogue wave is a huge wave that is generated by wave energy focusing. Rogue waves can cause critical damage to ships and offshore platforms due to their great wave energy and unpredictability. In this paper, to generate a rogue wave, a bull’s-eye wave, which is a focusing of multi-directional waves, was simulated in a numerical wave tank. A multi-directional wave generating boundary was developed using OpenFOAM, which is an open-source computational fluid dynamics (CFD) library. The wave height and profile of the generated rogue wave were compared to those of the regular wave. In addition, the pressure and velocity contours of water particles and velocity vectors at the free surface of the rogue wave were studied, along with the kinematic and dynamic effects of the rogue wave on a floating body. Full article
(This article belongs to the Special Issue Numerical Study on Wave Energy Converters)
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