Energy from Sea Waves

Topic Information

Dear Colleagues,

We are pleased to inform you that we are currently running a Topic entitled "Energy from Sea Waves". We kindly invite you to contribute a paper to this Topic.

The progressive increase in cost for energy production and the current geopolitical instability remarked the need for an energy transition towards renewable energy sources.

Among these, sea wave harvesting represents a relevant opportunity for this territory, exposed to the seas. In particular, the best opportunity is related to small islands.

Several concepts for wave harvesting have been proposed over the past two decades; however, commercial exploitation still seems to be unattainable.

This Topic encourages the submission of the following research and review articles:

• Proposal of new solutions for wave energy harvesting;
• Improvements of the technologies;
• Experiments on pilot plants;
• Preliminary energy assessment in case studies;
• Environmental assessment on wave energy harvesting.

Thank you for your consideration. We hope you consider this Topic to help expand upon the current literature.

Prof. Dr. Daniele Milone
Prof. Dr. Vincenzo Franzitta
Dr. Domenico Curto
Dr. Andrea Guercio
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Energies energies	3.0	6.2	2008	16.8 Days	CHF 2600
Journal of Marine Science and Engineering jmse	2.7	4.4	2013	16.4 Days	CHF 2600
Oceans oceans	1.5	3.1	2020	23.3 Days	CHF 1600
Remote Sensing remotesensing	4.2	8.3	2009	23.9 Days	CHF 2700
Water water	3.0	5.8	2009	17.5 Days	CHF 2600

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Published Papers (5 papers)

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All Energies JMSE Oceans Remote Sensing Water

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17 pages, 3959 KiB  

Open AccessArticle

A Dual-Function Design of an Oscillating Water Column Integrated with a Slotted Breakwater: A Wave Flume Study

by Clint C. M. Reyes, Mayah Walker, Zhenhua Huang and Patrick Cross

Energies 2024, 17(15), 3848; https://doi.org/10.3390/en17153848 - 5 Aug 2024

Cited by 3 | Viewed by 1165

Abstract

Wave energy conversion holds promise for renewable energy, but challenges like high initial costs hinder commercialization. Integrating wave-energy converters (WECs) into shore-protection structures creates dual-function structures for both electricity generation and coastal protection. Oscillating water columns (OWCs) have been well studied in the [...] Read more.

Wave energy conversion holds promise for renewable energy, but challenges like high initial costs hinder commercialization. Integrating wave-energy converters (WECs) into shore-protection structures creates dual-function structures for both electricity generation and coastal protection. Oscillating water columns (OWCs) have been well studied in the past with their simple generation mechanism and their out-of-water power take-off (PTO) system, which can minimize bio-fouling effects and maintenance costs compared to other submerged WECs. In addition, a slotted barrier allows for better circulation behind the breakwater while dissipating incoming wave energy through viscous damping. This study examines the performance of a new design which combines an OWC with a slotted breakwater. Small-scale (1:49) laboratory tests were performed with a piston-type wave generator. The performance is evaluated in terms of wave transmission, wave energy extraction, and wave loading under various wave conditions while focusing on the effects of the porosity of the slotted barrier and tide level changes. Results show that under larger waves, a decreasing wave transmission, increasing power extraction from the OWC, and energy dissipation from the slotted barrier are observed. On the other hand, under increasing wavelengths, wave transmission is observed to be constant; this is important for harbor design, which means that the breakwater is effective under a wider range of wavelengths. Porosity allows for more transmission while inducing less horizontal force on the structure. Full article

(This article belongs to the Topic Energy from Sea Waves)

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28 pages, 17728 KiB  

Open AccessArticle

Computational Fluid Dynamics Simulation on Blade Geometry of Novel Axial FlowTurbine for Wave Energy Extraction

by Mohammad Nasim Uddin, Yang Gao and Paul M. Akangah

Energies 2024, 17(14), 3602; https://doi.org/10.3390/en17143602 - 22 Jul 2024

Viewed by 1441

Abstract

Wave energy converters (WECs) utilizing the Oscillating Water Column (OWC) principle have gained prominence for harnessing kinetic energy from ocean waves. This study explores an innovative approach by transforming the pivoting Denniss–Auld turbine blades into a fixed configuration, offering a simplified alternative. The [...] Read more.

Wave energy converters (WECs) utilizing the Oscillating Water Column (OWC) principle have gained prominence for harnessing kinetic energy from ocean waves. This study explores an innovative approach by transforming the pivoting Denniss–Auld turbine blades into a fixed configuration, offering a simplified alternative. The fixed-blade design emulates the maximum pivot points during the OWC’s exhalation and inhalation phases. Traditional Denniss–Auld turbines rely on complex hub systems to enable controllable blade rotation for performance optimization. This research examines the turbine’s efficiency without mechanical actuation. The simulations were conducted using ANSYS™ CFX 2023 R2 to solve the three-dimensional, incompressible, steady-state Reynolds-Averaged Navier–Stokes (RANS) equations, employing the k-ω SST turbulence model to close the system of equations. A grid convergence study was performed, and the numerical results were validated against available experimental and numerical data. An in-depth analysis of the intricate flow field around the turbine blades was also conducted. The modified Denniss–Auld turbine demonstrated a broad operating range, avoiding stalling at high flow coefficients and exhibiting performance characteristics like an impulse turbine. However, the peak efficiency was 12%, significantly lower than that of conventional Denniss–Auld and impulse turbines. Future research should focus on expanding the design space through parametric studies to enhance turbine efficiency and power output. Full article

(This article belongs to the Topic Energy from Sea Waves)

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20 pages, 12608 KiB  

Open AccessArticle

Study of a Center Pipe Oscillating Column Wave Energy Converter Combined with a Triboelectric Nanogenerator Device

by Yan Huang, Shaohui Yang, Jianyu Fan, Zhichang Du, Beichen Lin, Yongqiang Tu and Lei Pan

J. Mar. Sci. Eng. 2024, 12(1), 100; https://doi.org/10.3390/jmse12010100 - 3 Jan 2024

Cited by 2 | Viewed by 1591

Abstract

Wave energy is one of the most widely distributed and abundant energies in the ocean, and its conversion technology has been broadly researched. In this paper, a structure that combines a traditional center pipe oscillating water column and a triboelectric nanogenerator is proposed. [...] Read more.

Wave energy is one of the most widely distributed and abundant energies in the ocean, and its conversion technology has been broadly researched. In this paper, a structure that combines a traditional center pipe oscillating water column and a triboelectric nanogenerator is proposed. Firstly, the structural characteristics and geometric parameters of the device are designed. The working process of the device is introduced, the motion equation of the device is established, and the power generation principle of the triboelectric nanogenerator is deduced and analyzed theoretically. Secondly, hydrodynamic modeling and simulation are carried out, the influence of the bottom shape of the main floating body and the structural parameters of the sag plate on the hydrodynamic force of the device is analyzed, and an electric field simulation of the generation process of the friction nanogenerator is carried out. Finally, experiments involving the wave water tank of the proposed device are conducted, including charging the capacitor of the device under different wave conditions and directly lighting the LED lamp. The performance of the proposed device under different wave conditions is discussed. According to the test results, the feasibility of the proposed device for wave energy conversion is confirmed. Full article

(This article belongs to the Topic Energy from Sea Waves)

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25 pages, 4835 KiB  

Open AccessArticle

Multi-Timescale Lookup Table Based Maximum Power Point Tracking of an Inverse-Pendulum Wave Energy Converter: Power Assessments and Sensitivity Study

by Xuhui Yue, Jintao Zhang, Feifeng Meng, Jiaying Liu, Qijuan Chen and Dazhou Geng

Energies 2023, 16(17), 6195; https://doi.org/10.3390/en16176195 - 25 Aug 2023

Cited by 1 | Viewed by 1362

Abstract

A novel, inverse-pendulum wave energy converter (NIPWEC) is a device that can achieve natural period control via a mass-position-adjusting mechanism and a moveable internal mass. Although the energy capture capacity of a NIPWEC has already been proven, it is still meaningful to research [...] Read more.

A novel, inverse-pendulum wave energy converter (NIPWEC) is a device that can achieve natural period control via a mass-position-adjusting mechanism and a moveable internal mass. Although the energy capture capacity of a NIPWEC has already been proven, it is still meaningful to research how to effectively control the NIPWEC in real time for maximum wave energy absorption in irregular waves. This paper proposes a multi-timescale lookup table based maximum power point tracking (MLTB MPPT) strategy for the NIPWEC. The MLTB MPPT strategy was implemented to achieve a theoretical “optimal phase” and “optimal amplitude” by adjusting both the position of the internal mass and linear power take-off (PTO) damping. It consists of two core parts, i.e., internal mass position adjustment based on a 1D resonance position table and PTO damping tuning based on a 2D optimal PTO damping table. Furthermore, power assessments and sensitivity study were conducted for eight irregular-wave sea states with diverse wave spectra. The results show that energy period resonance and the lookup table based PTO damping tuning have the highest possibility of obtaining the maximum mean time-averaged absorbed power. Additionally, both of them are robust to parameter variations. In the next step, the tracking performance of the MLTB MPPT strategy in terms of changing sea states will be studied in-depth. Full article

(This article belongs to the Topic Energy from Sea Waves)

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14 pages, 4483 KiB  

Open AccessArticle

Numerical Analysis of a Horizontal Pressure Differential Wave Energy Converter

by Manimaran Renganathan and Mamdud Hossain

Energies 2022, 15(20), 7513; https://doi.org/10.3390/en15207513 - 12 Oct 2022

Viewed by 1808

Abstract

CFD modeling of an innovative wave energy device has been carried out in this study. OpenFoam wave modeling solver interFoam has been employed in order to investigate the energy extraction capability of the wave energy device. The innovative concept is based on utilizing [...] Read more.

CFD modeling of an innovative wave energy device has been carried out in this study. OpenFoam wave modeling solver interFoam has been employed in order to investigate the energy extraction capability of the wave energy device. The innovative concept is based on utilizing the pressure differential under the crest and trough of a wave to drive flow through a pipe. The simulated surface elevation of a wave has been validated against the reported wave tank experimental data in order to provide confidence in the modeling outcome. Further, simulations have been carried out with the device placed near to the bottom of the numerical wave tank in order establish the energy extraction potential. The simulation results confirm that effective power can be generated from the wave energy device. The efficiency of the device decreases with the increase in wave height, although it increases with the wave period. Higher power-take off (PTO) damping is also beneficial in extracting increased energy from waves. Full article

(This article belongs to the Topic Energy from Sea Waves)

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