numerical modelling of wave energy converters

Numerical Modelling Of Wave Energy Converters
Author: Matt Folley
Publisher: Academic Press
Release Date: 2016-06-14
Pages: 306
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

Numerical Modelling of Wave Energy Converters: State-of-the Art Techniques for Single WEC and Converter Arrays presents all the information and techniques required for the numerical modelling of a wave energy converter together with a comparative review of the different available techniques. The authors provide clear details on the subject and guidance on its use for WEC design, covering topics such as boundary element methods, frequency domain models, spectral domain models, time domain models, non linear potential flow models, CFD models, semi analytical models, phase resolving wave propagation models, phase averaging wave propagation models, parametric design and control optimization, mean annual energy yield, hydrodynamic loads assessment, and environmental impact assessment. Each chapter starts by defining the fundamental principles underlying the numerical modelling technique and finishes with a discussion of the technique’s limitations and a summary of the main points in the chapter. The contents of the chapters are not limited to a description of the mathematics, but also include details and discussion of the current available tools, examples available in the literature, and verification, validation, and computational requirements. In this way, the key points of each modelling technique can be identified without having to get deeply involved in the mathematical representation that is at the core of each chapter. The book is separated into four parts. The first two parts deal with modelling single wave energy converters; the third part considers the modelling of arrays; and the final part looks at the application of the different modelling techniques to the four most common uses of numerical models. It is ideal for graduate engineers and scientists interested in numerical modelling of wave energy converters, and decision-makers who must review different modelling techniques and assess their suitability and output. Consolidates in one volume information and techniques for the numerical modelling of wave energy converters and converter arrays, which has, up until now, been spread around multiple academic journals and conference proceedings making it difficult to access Presents a comparative review of the different numerical modelling techniques applied to wave energy converters, discussing their limitations, current available tools, examples, and verification, validation, and computational requirements Includes practical examples and simulations available for download at the book’s companion website Identifies key points of each modelling technique without getting deeply involved in the mathematical representation

Physical And Numerical Modelling Of Wave Energy Converter Arrays
Author: Paul Lamont-Kane
Publisher:
Release Date: 2015
Pages:
ISBN:
Available Language: English, Spanish, And French
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Numerical Modelling Of Responses Of Offshore Wave Energy Converters In Extreme Waves
Author: Pierre-Henri Musiedlak
Publisher:
Release Date: 2019
Pages:
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

Offshore Wind Turbines And Wave Energy Converters
Author: Constantine Michailides
Publisher:
Release Date: 2018-11-08
Pages:
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

Offshore Renewable Energy  Ocean Waves  Tides And Offshore Wind
Author: Eugen Rusu
Publisher: MDPI
Release Date: 2019-02-11
Pages: 370
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

This book is a printed edition of the Special Issue "Offshore Renewable Energy: Ocean Waves, Tides and Offshore Wind" that was published in Energies

Wave Energy Potential  Behavior And Extraction
Author: Hua Li
Publisher: MDPI
Release Date: 2020-03-27
Pages: 238
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

Wave energy has a higher potential than most of the available ocean energy resources; however, it fluctuates dramatically depending on geographical and temporal baselines. The complexity of wave energy is only exacerbated by that fact that the cycle of creation, transport, and disappearance of wave energy is influenced by a wide variety of factors. This Special Issue of Energies explores the latest developments in wave energy potential, behavior, and extraction. This Special Issue introduces 1) thorough reviews on the status of wave energy development, 2) novel technologies to extract wave energy including wave energy converter design, and 3) latest methodologies applied in analyzing wave energy potentials.

Renewable Energy In Marine Environment
Author: Eugen Rusu
Publisher: MDPI
Release Date: 2020-03-25
Pages: 324
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

The effects of human-caused global warming are obvious, requiring new strategies and approaches. The concept of business-as-usual is now no longer beneficial. Extraction of renewable energy in marine environments represents a viable solution and an important path for the future. These huge renewable energy resources in seas and oceans can be harvested, including wind, tide, and waves. Despite the initial difficulties related mostly to the elevated operational risks in the harsh marine environment, newly developed technologies are economically effective or promising. Simultaneously, many challenges remain to be faced. These are the main issues targeted by the present book, which is associated with the Special Issue of Energies Journal entitled “Renewable Energy in Marine Environment”. Papers on innovative technical developments, reviews, case studies, and analytics, as well as assessments, and papers from different disciplines that are relevant to the topic are included. From this perspective, we hope that the results presented are of interest to for scientists and those in related fields such as energy and marine environments, as well as for a wider audience.

Thermodynamics And Morphodynamics In Wave Energy
Author: Antonio Moñino
Publisher: Springer
Release Date: 2018-04-20
Pages: 104
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

This book examines the performance of oscillating water column (OWC) wave energy converters. It discusses the influence of humid air inside the chamber and changes in the seabed, and also investigates the role of wave energy converters in coastal protection. The authors use a real gas model to describe the thermodynamics of the air–water vapour mixture inside the chamber, and the compression and expansion process during the wave cycle. Further, they present an alternative formulation with new perspectives on the adiabatic process of the gaseous phase, including a modified adiabatic index, and subsequent modified thermodynamic state variables such as enthalpy, entropy and specific heat. The book also develops a numerical model using computational fluid dynamics to simulate OWC characteristics in open sea, and studies the performance of a linear turbine using an actuator disk model. It then compares the results from both cases to find an agreement between the analytical and numerical models when humidity is inserted in the gaseous phase. Introducing new concepts to studies of wave energy to provide fresh perspectives on energy extraction and efficiency problems, the book is a valuable resource for researchers and industrial companies involved in thermal energy and coastal engineering. It is also of interest to undergraduate and postgraduate students, as it broadens their view of wave energy.

Ocean Wave Energy
Author: Joao Cruz
Publisher: Springer Science & Business Media
Release Date: 2007-12-22
Pages: 431
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

The authors of this timely reference provide an updated and global view on ocean wave energy conversion – and they do so for wave energy developers as well as for students and professors. The book is orientated to the practical solutions that this new industry has found so far and the problems that any device needs to face. It describes the actual principles applied to machines that convert wave power to electricity and examines state-of-the-art modern systems.

Assessment And Nonlinear Modeling Of Wave  Tidal And Wind Energy Converters And Turbines
Author: Madjid Karimirad
Publisher:
Release Date: 2020-09-04
Pages: 290
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

The Special Issue "Assessment and Nonlinear Modeling of Wave, Tidal, and Wind Energy Converters and Turbines" contributes original research to stimulate the continuing progress of the offshore renewable energy (ORE) field, with a focus on state-of-the-art numerical approaches developed for the design and analysis of ORE devices. Particularly, this collection provides new methodologies, analytical/numerical tools, and theoretical methods that deal with engineering problems in the ORE field of wave, wind, and current structures. This Special Issue covers a wide range of multidisciplinary aspects, such as the 1) study of generalized interaction wake model systems with elm variation for offshore wind farms; 2) a flower pollination method based on global maximum power point tracking strategy for point-absorbing type wave energy converters; 3) performance optimization of a Kirsten-Boeing turbine using a metamodel based on neural networks coupled with CFD; 4) proposal of a novel semi-submersible floating wind turbine platform composed of inclined columns and multi-segmented mooring lines; 5) reduction of tower fatigue through blade back twist and active pitch-to-stall control strategy for a semi-submersible floating offshore wind turbine; 6) assessment of primary energy conversion of a closed-circuit OWC wave energy converter; 7) development and validation of a wave-to-wire model for two types of OWC wave energy converters; 8) assessment of a hydrokinetic energy converter based on vortex-induced angular oscillations of a cylinder; 9) application of wave-turbulence decomposition methods on a tidal energy site assessment; 10) parametric study for an oscillating water column wave energy conversion system installed on a breakwater; 11) optimal dimensions of a semisubmersible floating platform for a 10 MW wind turbine; 12) fatigue life assessment for power cables floating in offshore wind turbines.

3D Non Linear Numerical Hydrodynamic Modelling Of Floating Wave Energy Converters
Author: Majid Bhinder
Publisher:
Release Date: 2013
Pages: 146
ISBN:
Available Language: English, Spanish, And French
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Numerical And Experimental Modelling Of An Oscillating Wave Surge Converter In Partially Standing Wave Systems
Author: Bryce Bocking
Publisher:
Release Date: 2017
Pages:
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

In the field of ocean wave energy converters (WECs), active areas of research are on a priori or in situ methods for power production estimates and on control system design. Linear potential flow theory modelling techniques often underpin these studies; however, such models rely upon small wave and body motion amplitude assumptions and therefore cannot be applied to all wave conditions. Nonlinear extensions can be applied to the fluid loads upon the structure to extend the range of wave conditions for which these models can provide accurate predictions. However, careful consideration of the thresholds of wave height and periods to which these models can be applied is still required. Experimental modelling in wave tank facilities can be used for this purpose by comparing experimental observations to numerical predictions using the experimental wave field as an input. This study establishes a recommended time domain numerical modeling approach for power production assessments of oscillating wave surge converters (OWSCs), a class of WEC designed to operate in shallow and intermediate water depths. Three candidate models were developed based on nonlinear numerical modelling techniques in literature, each with varying levels of complexity. Numerical predictions provided by each model were found to be very similar for small wave amplitudes, but divergence between the models was observed as wave height increased. Experimental data collected with a scale model OWSC for a variety of wave conditions was used to evaluate the accuracy of the candidate models. These experiments were conducted in a small-scale wave flume at the University of Victoria. A challenge with this experimental work was managing wave reflections from the boundaries of the tank, which were significant and impacted the dynamics of the scale model OWSC. To resolve this challenge, a modified reflection algorithm based upon the Mansard and Funke method was created to identify the incident and reflected wave amplitudes while the OWSC model is in the tank. Both incident and reflected wave amplitudes are then input to the candidate models to compare numerical predictions with experimental observations. The candidate models agreed reasonably well with the experimental data, and demonstrated the utility of the modified wave reflection algorithm for future experiments. However, the maximum wave height generated in the wave tank was found to be limited by the stroke length of the wavemaker. As a result, no significant divergence of the candidate model predictions from the experimental data could be observed for the limited range of wave conditions, and therefore a recommended model could not be selected based solely on the experimental/numerical model comparisons. Preliminary assessments of the annual power production (APP) for the OWSC were obtained for a potential deployment site on the west coast of Vancouver Island. Optimal power take-off (PTO) settings for the candidate models were identified using a least-squares optimization to maximize power production for a given set of wave conditions. The power production of the OWSC at full scale was then simulated for each bin of a wave histogram representing one year of sea states at the deployment site. Of the three candidate models, APP estimates were only obtained for Model 1, which has the lowest computational requirements, and Model 3, which implements the most accurate algorithm for computing the fluid loads upon the OWSC device. Model 2 was not considered as it provides neither advantages of Models 1 and 3. The APP estimates from Models 1 and 3 were 337 and 361 MWh per year. For future power production assessments, Model 3 is recommended due to its more accurate model of the fluid loads upon the OWSC. However, if the high computational requirements of Model 3 are problematic, then Model 1 can be used to obtain a slightly conservative estimate of APP with a much lower computational effort.

Wave And Tidal Energy
Author: Deborah Greaves
Publisher: John Wiley & Sons
Release Date: 2018-07-23
Pages: 720
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

A comprehensive text covering all aspects of wave and tidal energy Wave and Tidal Energy provides a comprehensive and self-contained review of the developing marine renewable energy sector, drawing from the latest research and from the experience of device testing. The book has a twofold objective: to provide an overview of wave and tidal energy suitable for newcomers to the field and to serve as a reference text for advanced study and practice. Including detail on key issues such as resource characterisation, wave and tidal technology, power systems, numerical and physical modelling, environmental impact and policy. The book also includes an up-to-date review of developments worldwide and case studies of selected projects. Key features: A comprehensive and self-contained text covering all aspects of the multidisciplinary fields of wave and tidal energy. Draws upon the latest research in wave and tidal energy and the experience of leading practitioners in numerical and laboratory modelling. Regional developments worldwide are reviewed and representative projects are presented as case studies. Wave and Tidal Energy is an invaluable resource to a wide range of readers, from engineering students to technical managers and policymakers to postgraduate students and researchers.

Progress In Maritime Technology And Engineering
Author: Carlos Guedes Soares
Publisher: CRC Press
Release Date: 2018-04-17
Pages: 716
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

Progress in Maritime Technology and Engineering collects the papers presented at the 4th International Conference on Maritime Technology and Engineering (MARTECH 2018, Lisbon, Portugal, 7–9 May 2018). This conference has evolved from a series of biannual national conferences in Portugal, and has developed into an international event, reflecting the internationalization of the maritime sector and its activities. MARTECH 2018 is the fourth in this new series of biannual conferences. Progress in Maritime Technology and Engineering contains about 80 contributions from authors from all parts of the world, which were reviewed by an International Scientific Committee. The book is divided into the subject areas below: - Port performance - Maritime transportation and economics - Big data in shipping - Intelligent ship navigation - Ship performance - Computational fluid dynamics - Resistance and propulsion - Ship propulsion - Dynamics and control - Marine pollution and sustainability - Ship design - Ship structures - Structures in composite materials - Shipyard technology - Coating and corrosion - Maintenance - Risk analysis - Offshore and subsea technology - Ship motion - Ships in transit - Wave-structure interaction - Wave and wind energy - Waves Progress in Maritime Technology and Engineering will be of interest to academics and professionals involved in the above mentioned areas.

CFD Optimisation Of An Oscillating Water Column Wave Energy Converter
Author: Michael Horko
Publisher:
Release Date: 2007
Pages: 145
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

Although oscillating water column type wave energy devices are nearing the stage of commercial exploitation, there is still much to be learnt about many facets of their hydrodynamic performance. This research uses the commercially available FLUENT computational fluid dynamics flow solver to model a complete OWC system in a two dimensional numerical wave tank. A key feature of the numerical modelling is the focus on the influence of the front wall geometry and in particular the effect of the front wall aperture shape on the hydrodynamic conversion efficiency. In order to validate the numerical modelling, a 1:12.5 scale experimental model has been tested in a wave tank under regular wave conditions. The effects of the front lip shape on the hydrodynamic efficiency are investigated both numerically and experimentally and the results compared. The results obtained show that with careful consideration of key modelling parameters as well as ensuring sufficient data resolution, there is good agreement between the two methods. The results of the testing have also illustrated that simple changes to the front wall aperture shape can provide marked improvements in the efficiency of energy capture for OWC type devices.

Preliminary Design And Analysis Of A Wave Energy Converter With Electromagnetic Induction
Author: Laura Fernández de Valderrama
Publisher:
Release Date: 2020
Pages:
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

As the energy demand increases with the constantly increasing population, as well as the effort to replace conventional fossil fuels with cleaner sources of energy, ocean energy has emerged as a potential global resource. The ocean contains an enormous amount of energy that has not been exploited yet, although efforts have augmented during the past decades. The overall purpose of this research is to design, model, and analyze, a wave energy converter (WEC) prototype to contribute to the current research in this field. This particular work represents the first stage of the research process in which the ultimate goal is to introduce a WEC prototype that can overcome previous challenges, and/or improve energy harnessing from previous models. The focus of this paper is to study previous wave energy systems, both successful and unsuccessful, investigate what has been done up to date, and perform a numerical model analysis of two different body shapes and at two different water depths. Also, a local case study of ocean wave's conditions is performed. The objective is to compute the design parameters of the working environment and to analyze both numerical models, so that a small-scale model of the prototype can be implemented in the next phase of this research and tested experimentally.

Analysis Of A Cycloidal Wave Energy Converter Using Unsteady Reynolds Averaged Navier Stokes Simulation
Author: Christopher J. Caskey
Publisher:
Release Date: 2014
Pages: 137
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

"A computational fluid dynamic study was completed to investigate the two-dimensional wave generation and cancellation characteristics of the Atargis Cycloidal Wave Energy Converter (CycWEC). The numerical modeling was based on the unsteady Reynolds average Navier Stokes (URANS) equations and determined the free surface fluctuations using the volume of fluid method. A specialized hybrid grid design was required to accurately resolve the complex viscous flow field resulting from one or more hydrofoils rotating beneath the free surface at a constant angular velocity. The research progressed incrementally from single and two-hydrofoil wave generation concluded with two-hydrofoil wave cancellation. Unlike previous inviscid simulations, the URANS simulations were able to model nonlinear free surface interactions and viscous effects, allowing shaft torques to be numerically predicted for first time. It also provided complete velocity and pressure fields which previous experimental work could not. A grid refinement and time step sensitivity study are completed to increase simulation accuracy and computational efficiency. Fluctuations of wave height, surface pressure distribution, hydrodynamic force, and device efficiency from generated and cancelled wave fields are examined in detail for various hydrofoil pitch angles. For two-hydrofoil wave generation with large pitch angles URANS simulations predicted 94% of the required shaft power is transferred directly to the generated wave field. When operated as an energy extraction device the URANS simulations predicted that up to 92% of the incident wave field was cancelled and 82.7% of the average incident wave power was converted to useful shaft power."--Pages ii-iii.

Transfer Phenomena In Fluid And Heat Flows X
Author: Luiz Alberto Oliveira Rocha
Publisher: Trans Tech Publications Ltd
Release Date: 2019-08-16
Pages: 218
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

This special issue “Transfer Phenomena in Fluid and Heat Flows X” in the journal "Defect and Diffusion Forum" presents a collection of peer-reviewed works associated with diffusion phenomena, the motion of the fluid flow and heat transfer in the technical and natural systems.

Fluid Flow  Energy Transfer And Design II
Author: Antonio F. Miguel
Publisher: Trans Tech Publications Ltd
Release Date: 2015-04-07
Pages: 262
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

Fluid flow, thermodynamics and heat/mass transfer are nowadays central pillars of science and technology. They have been central to the development of our civilization because we use them not only to understand natural-world phenomena but also to achieve incremental improvements in technology. The special session “Fluid Flow, Energy Transfer and Design” held at the 10th International Conference on Diffusion in Solids and Liquids (DSL 2014) includes papers of different areas ranging from physics, mathematics and chemistry to engineering and provided several contributions for this topical volume. Other experts in the field of heat and mass transfer were as well invited to contribute to this volume.

Reference Model 6  RM6
Author:
Publisher:
Release Date: 2014
Pages: 85
ISBN:
Available Language: English, Spanish, And French
EBOOK SYNOPSIS:

This report is an addendum to SAND2013-9040: Methodology for Design and Economic Analysis of Marine Energy Conversion (MEC) Technologies. This report describes an Oscillating Water Column Wave Energy Converter reference model design in a complementary manner to Reference Models 1-4 contained in the above report. In this report, a conceptual design for an Oscillating Water Column Wave Energy Converter (WEC) device appropriate for the modeled reference resource site was identified, and a detailed backward bent duct buoy (BBDB) device design was developed using a combination of numerical modeling tools and scaled physical models. Our team used the methodology in SAND2013-9040 for the economic analysis that included costs for designing, manufacturing, deploying, and operating commercial-scale MEC arrays, up to 100 devices. The methodology was applied to identify key cost drivers and to estimate levelized cost of energy (LCOE) for this RM6 Oscillating Water Column device in dollars per kilowatt-hour ($/kWh). Although many costs were difficult to estimate at this time due to the lack of operational experience, the main contribution of this work was to disseminate a detailed set of methodologies and models that allow for an initial cost analysis of this emerging technology. This project is sponsored by the U.S. Department of Energy's (DOE) Wind and Water Power Technologies Program Office (WWPTO), within the Office of Energy Efficiency & Renewable Energy (EERE). Sandia National Laboratories, the lead in this effort, collaborated with partners from National Laboratories, industry, and universities to design and test this reference model.