Wave energy potential in Portugal–Assessment based on probabilistic description of ocean waves parameters

2012 ◽  
Vol 47 ◽  
pp. 1-8 ◽  
Author(s):  
R.P.G. Mendes ◽  
M.R.A. Calado ◽  
S.J.P.S. Mariano
Keyword(s):  
Wave Energy ◽  
Ocean Waves ◽  
Energy Potential ◽  
Probabilistic Description

Integration of Wave Energy Harnessing Technologies to the Needs of Coastal Societies in North Carolina

2018 ◽  
Author(s):  
Akshith Subramanian ◽  
Gagee Raut ◽  
Navid Goudarzi
Keyword(s):  
North Carolina ◽  
Wave Energy ◽  
Reference Model ◽  
Ocean Waves ◽  
The Body ◽  
Department Of Energy ◽  
Dynamic Responses ◽  
Stable Form ◽  
Energy Potential ◽  
Wave Data

Wave Energy is a predictable and stable form of renewable energies. In this work, the wave energy potential along the North Carolina shore is calculated using six-year (2012–2017) National Buoy Database (NDBC). The wave data from two buoys (US 192 and US 430) were collected and the average significant wave height (HS) and corresponding time period (T) were determined. The Reference Model 3 (RM3) defined by Department of Energy (DOE) was used to explore the potential power generation from wave energy. Simulations were setup on WEC-Sim, an open-source code based on MATLAB developed by the DOE. A six-degree of freedom solver was used to obtain the results for heave and pitch forces for the float. Dynamic responses were calculated by solving equations of motion based on Cummins’ equation about the body center of gravity. Waves were modeled as irregular ocean waves using North Carolina shore wave data. The preliminary results obtained the heave and surge forces on RM3 and the body reaction forces. The results from this work can be used for determination of RM3 performance for NC shore.

Hydro-Dynamic Simulation of a Cylinder Buoy for Wave Energy Conversion

2011 ◽  
Author(s):  
Carlos Velez ◽  
Brent Papesh ◽  
Marcel Ilie ◽  
Zhihua Qu
Keyword(s):  
Renewable Energy ◽  
Wave Energy ◽  
Fossil Fuels ◽  
Electrical Power ◽  
Vertical Motion ◽  
Ocean Waves ◽  
Offshore Structures ◽  
Wave Energy Conversion ◽  
Energy Potential ◽  
Relative Water

Development of technology to harness the vast amount of renewable energy available in nature has been ever-increasing in popularity. A worldwide desire to limit dependency on fossil fuels as a means to produce power has motivated research in solar, wind, and wave energies, as well as other clean, naturally-abundant energy sources. With a density approximately 1000 times greater than air, the energy potential of ocean water is tremendous, and it is capable of providing power to locations in which other forms of renewable energy are not applicable—namely coastal regions with minimal wind or sunshine, or offshore structures. This research details the hydro-dynamic modeling of an innovative buoy design for a wave energy harvester that converts the heaving motion of waves into electrical power. Power is generated through the use of a bi-directional turbine which is driven by the relative water velocity created by the heaving buoy. In order to predict the changing velocity profile in which the bi-directional turbine will experience, a hydro-dynamic model has been created with a smoother particle hydro-dynamics code, SPHysics. The model can accurately simulate the motion of the buoy as it is excited by various ocean waves for different ocean depths. In order to maximize the flow velocity through the turbine, various geometric parameters will be altered to attempt to have the buoy and ocean wave perfectly out of phase. Additionally, the buoys stability is studied to determine the optimal geometry to promote a vertical motion as any yaw or pitching motion can not be harnessed by the bi-directional turbine.

Numerical Modeling to Aid in the Structural Health Monitoring of Wave Energy Converters

2013 ◽  
Vol 569-570 ◽  
pp. 595-602 ◽  
Author(s):  
William Finnegan ◽  
Jamie Goggins
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Wave Energy ◽  
Numerical Models ◽  
Wave Structure ◽  
Ocean Waves ◽  
Test Site ◽  
Structural Health ◽  
Wave Energy Converters ◽  
Energy Converters

A vital aspect of ensuring the cost effectiveness of wave energy converters (WECs) is being able to monitor their performance remotely through structural health monitoring, as these devices are deployed in very harsh environments in terms of both accessibility and potential damage to the devices. The WECs are monitored through the use of measuring equipment, which is strategically placed on the device. This measured data is then compared to the output from a numerical model of the WEC under the same ocean wave conditions. Any deviations would suggest that there are problems or issues with the WEC. The development of accurate and effective numerical models is necessary to minimise the number of times the visual, or physical, inspection of a deployed WEC is required. In this paper, a numerical wave tank model is, first, validated by comparing the waves generated to those generated experimentally using the wave flume located at the National University of Ireland, Galway. This model is then extended so it is suitable for generating real ocean waves. A wave record observed at the Atlantic marine energy test site has been replicated in the model to a high level of accuracy. A rectangular floating prism is then introduced into the model in order to explore wave-structure interaction. The dynamic response of the structure is compared to a simple analytical solution and found to be in good agreement.

Evaluation of 3-D Computational Model of Oscillating Water Column Converter with Constructal Design with Three Degrees of Freedom and Limited Chimney Height

2021 ◽  
Vol 407 ◽  
pp. 128-137
Author(s):  
Vinícius Bloss ◽  
Camila Fernandes Cardozo ◽  
Flávia Schwarz Franceschini Zinani ◽  
Luiz Alberto Oliveira Rocha
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Degrees Of Freedom ◽  
Numerical Study ◽  
Mechanical Energy ◽  
Ocean Waves ◽  
Response Surfaces ◽  
Oscillating Water Column ◽  
Promising Source ◽  
Three Degrees Of Freedom

Theoretically, ocean waves contain enough mechanical energy to supply the entire world’s demand and, as of late, are seen as a promising source of renewable energy. To this end, several different technologies of Wave Energy Converters (WEC) have been developed such as Oscillating Water Column (OWC) devices. OWCs are characterized by a chamber in which water oscillates inside and out in a movement similar to that of a piston. This movement directs air to a chimney where a turbine is attached to convert mechanical energy. The analysis conducted was based on the Constructive Design Method, in which a numerical study was carried out to obtain the geometric configuration that maximized the conversion of wave energy into mechanical energy. Three degrees of freedom were used: the ratio of height to length of the hydropneumatic chamber (H1/L), the ratio of the height of the chimney to its diameter (H2/d) and the ratio of the width of the hydropneumatic chamber to the width of the wave tank (W/Z). A Design of Experiments (DoE) technique coupled with Central Composite Design (CCD) allowed the simulation of different combinations of degrees of freedom. This allowed the construction of Response Surfaces and correlations for the efficiency of the system depending on the degrees of freedom (width and height of the chamber), as well as the optimization of the system based on the Response Surfaces.

Wave energy potential and variability for the south west coasts of the Black Sea: The WEB-based wave energy atlas

2020 ◽  
Vol 154 ◽  
pp. 136-150 ◽  
Author(s):  
Bilal Bingölbali ◽  
Halid Jafali ◽  
Adem Akpınar ◽  
Serkan Bekiroğlu
Keyword(s):  
Black Sea ◽  
Wave Energy ◽  
The Black Sea ◽  
The South ◽  
Energy Potential ◽  
Web Based ◽  
South West ◽  
The Web

scholarly journals Deep Learning for Wave Energy Converter Modeling Using Long Short Term Memory

2021 ◽  
Author(s):  
Seyed Milad Mousavi ◽  
Majid Ghasemi ◽  
Mahsa Dehghan Manshadi ◽  
Amir Mosavi
Keyword(s):  
Wind Speed ◽  
Output Power ◽  
Wave Energy ◽  
Short Term Memory ◽  
Ocean Waves ◽  
Wave Energy Converter ◽  
Energy Converter ◽  
Short Term ◽  
Term Memory ◽  
Long Short Term Memory

Accurate forecasts of ocean waves energy can not only reduce costs for investment but it is also essential for management and operation of electrical power. This paper presents an innovative approach based on the Long Short Term Memory (LSTM) to predict the power generation of an economical wave energy converter named “Searaser”. The data for analyzing is provided by collecting the experimental data from another study and the exerted data from numerical simulation of searaser. The simulation is done with Flow-3D software which has high capability in analyzing the fluid solid interactions. The lack of relation between wind speed and output power in previous studies needs to be investigated in this field. Therefore, in this study the wind speed and output power are related with a LSTM method. Moreover, it can be inferred that the LSTM Network is able to predict power in terms of height more accurately and faster than the numerical solution in a field of predicting. The network output figures show a great agreement and the root mean square is 0.49 in the mean value related to the accuracy of LSTM method. Furthermore, the mathematical relation between the generated power and wave height was introduced by curve fitting of the power function to the result of LSTM method.

scholarly journals Exploitation of Wave Energy Potential in Aegean Sea: Greece

2016 ◽  
pp. 515-529 ◽  
Author(s):  
F. Xanthaki ◽  
Chr. Giannaraki ◽  
E. F. Zafeiraki ◽  
J. K. Kaldellis
Keyword(s):  
Wave Energy ◽  
Aegean Sea ◽  
Energy Potential

scholarly journals A New Solution for Sea Wave Energy Harvesting, the Proposal of an Ironless Linear Generator

2020 ◽  
Vol 8 (2) ◽  
pp. 93 ◽  
Author(s):  
Domenico Curto ◽  
Alessia Viola ◽  
Vincenzo Franzitta ◽  
Marco Trapanese ◽  
Fabio Cardona
Keyword(s):  
Wave Energy ◽  
Magnetic Force ◽  
Vertical Motion ◽  
Small Islands ◽  
Sea Waves ◽  
Energy Converter ◽  
Energy Potential ◽  
Linear Generator ◽  
Three Phase ◽  
Sea Wave

The paper investigates an innovative ironless linear generator, installable inside a wave energy converter, in order to produce electricity from sea waves. This energy source is considered strategic for the future, especially in small islands; however, this technology is still far from the commercial phase. Considering the wave energy potential of the Mediterranean Sea, a first prototype of the electrical linear generator was realized at the Department of Engineering of Palermo University. This machine can be run by a two-floating buoys system, able to produce a linear vertical motion. The main goal of this paper is the investigation of the advantages and the disadvantages of the utilization of steel materials to realize the stator of linear generators. Thus, starting from the prototype, the authors analyzed the effects produced by the replacement of steel in the stator with a non-magnetic material. For comparison, the authors evaluated the amplitude of no-load voltages, using a three-phase connection scheme, and the amplitude of the magnetic force produced by the interaction of magnets with the stator. Both aspects were evaluated through numerical simulations and mathematical models.

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