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  • 1
    Online Resource
    Online Resource
    Investigation of Numerical Irregular Wave Generation Using Transient Discrete Data as Boundary Conditions of Prescribed Velocity
    Trans Tech Publications, Ltd. ; 2023
    In:  Defect and Diffusion Forum Vol. 427 ( 2023-07-14), p. 227-235
    Details
    In: Defect and Diffusion Forum, Trans Tech Publications, Ltd., Vol. 427 ( 2023-07-14), p. 227-235
    Abstract: This work presents a two-dimensional numerical analysis of a wave channel. The goal is to investigate a methodology that uses transient velocity data as means to impose velocity boundary condition for generating numerical waves. To do so, a numerical wave channel was simulated using irregular waves. These waves were obtained using the WaveMIMO methodology, which converts sea data from a spectral model into time series of free surface elevation, and then converts this elevation into transient discrete wave velocity data. For the numerical analysis, computational fluid dynamics ANSYS Fluent software was employed, which is based on the finite volume method. The computational domain and mesh were generated using GMSH software, and the nonlinear multiphase model volume of fluid (VOF) was applied to tackle water-air interaction. In general, the results obtained through the use of discrete data as velocity boundary condition presented a good agreement with free surface elevation converted from the spectral model, and the tests performed provided further insight into the parameters which affect this methodology. Since many studies use regular waves, the proposed investigation stands out for its capacity to improve the use of realistic sea state data in numerical simulations of wave energy converters.
    Type of Medium: Online Resource
    ISSN: 1662-9507
    URL: Issue
    URL: Article
    DOI: 10.4028/v-mPrJt1
    DOI: 10.4028/p-s0MLH2
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2023
    detail.hit.zdb_id: 2051135-8
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  • 2
    Online Resource
    Online Resource
    ANÁLISE NUMÉRICA DA GEOMETRIA DA RAMPA DE UM DISPOSITIVO DE GALGAMENTO ONSHORE EM ESCALA REAL APLICANDO O DESIGN CONSTRUTAL
    Universidade Federal do Parana ; 2017
    In:  Revista Brasileira de Energias Renováveis Vol. 6, No. 3 ( 2017-06-02)
    Details
    In: Revista Brasileira de Energias Renováveis, Universidade Federal do Parana, Vol. 6, No. 3 ( 2017-06-02)
    Abstract: O presente trabalho propõe um estudo numérico a respeito de um conversor de energia das ondas do mar do tipo galgamento. O princípio operacional do dispositivo de galgamento consiste de uma estrutura que utiliza uma rampa para direcionar as ondas incidentes para o reservatório. A água armazenada retorna ao oceano após a passagem por uma turbina que está acoplada a um gerador de energia elétrica. O objetivo deste estudo é a aplicação do método Design Construtal, aliado a busca exaustiva, na definição da melhor forma geométrica para a rampa de modo a maximizar a vazão mássica de água que entra no reservatório. O grau de liberdade b/B foi otimizado. A restrição considerada neste estudo é manter fixo: a área total do tanque de ondas, a área da rampa e as características da onda. Para a análise numérica do princípio de funcionamento deste dispositivo foi empregado um domínio computacional tridimensional (3D), construído e discretizado no software GAMBIT, onde o conversor é acoplado a um tanque de ondas regulares. As soluções das equações de conservação e uma equação para o transporte da fração volumétrica foram realizadas com o código comercial de Dinâmica dos Fluidos Computacional FLUENT, que é baseado no Método de Volumes Finitos (MVF). Aplica-se o modelo multifásico Volume of Fluid (VOF) no tratamento da interação água-ar. Os resultados conduziram a uma recomendação teórica sobre a geometria ótima do dispositivo de galgamento, mostrando que houve uma razão ótima (b/B)o = 0.38, que maximiza a quantidade de água que entra no reservatório.Palavras-chave: Galgamento, Teoria Construtal, Análise Numérica.
    Type of Medium: Online Resource
    ISSN: 2237-9711
    URL: Issue
    URL: Article
    DOI: 10.5380/rber.v6i3
    DOI: 10.5380/rber.v6i3.52999
    Language: Unknown
    Publisher: Universidade Federal do Parana
    Publication Date: 2017
    detail.hit.zdb_id: 2890460-6
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  • 3
    Online Resource
    Online Resource
    Numerical Study of the Effect of the Relative Depth on the Overtopping Wave Energy Converters According to Constructal Design
    Trans Tech Publications, Ltd. ; 2014
    In:  Defect and Diffusion Forum Vol. 348 ( 2014-1), p. 232-244
    Details
    In: Defect and Diffusion Forum, Trans Tech Publications, Ltd., Vol. 348 ( 2014-1), p. 232-244
    Abstract: The conversion of wave energy in electrical one has been increasingly studied. One example of wave energy converter (WEC) is the overtopping device. Its main operational principle consists of a ramp which guides the incoming waves into a reservoir raised slightly above the sea level. The accumulated water in the reservoir flows through a low head turbine generating electricity. In this sense, it is performed a numerical study concerned with the geometric optimization of an overtopping WEC for various relative depths: d /λ = 0.3, 0.5 and 0.62, by means of Constructal Design. The main purpose is to evaluate the effect of the relative depth on the design of the ramp geometry (ratio between the ramp height and its length: H 1 / L 1 ) as well as, investigate the shape which leads to the highest amount of water that insides the reservoir. In the present simulations, the conservation equations of mass, momentum and one equation for the transport of volumetric fraction are solved with the finite volume method (FVM). To tackle with water-air mixture, the multiphase model Volume of Fluid (VOF) is used. Results showed that the optimal shape, ( H 1 / L 1 ) o , has a strong dependence of the relative depth, i.e., there is no universal shape that leads to the best performance of an overtopping device for several wave conditions.
    Type of Medium: Online Resource
    ISSN: 1662-9507
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/DDF.348
    DOI: 10.4028/www.scientific.net/DDF.348.232
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
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  • 4
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    Online Resource
    ESTUDO DE PRODUÇÃO E AUTORIA ATRAVÉS DA METODOLOGIA BIBLIOMÉTRICA DE DISPOSITIVOS DE GALGAMENTO APLICADOS A CONVERSÃO DA ENERGIA DAS ONDAS
    Revista Mundi ; 2020
    In:  Revista Mundi Engenharia, Tecnologia e Gestão (ISSN: 2525-4782) Vol. 5, No. 3 ( 2020-07-14)
    Details
    In: Revista Mundi Engenharia, Tecnologia e Gestão (ISSN: 2525-4782), Revista Mundi, Vol. 5, No. 3 ( 2020-07-14)
    Abstract: O presente estudo visa a análise de produção e autoria de artigos científicos acerca da utilização do dispositivo para conversão de energia das ondas do mar em energia elétrica do tipo galgamento através da Metodologia Bibliométrica. O presente estudo deu-se através de artigos selecionados a partir de anais de congressos e periódicos nacionais e internacionais. O princípio de funcionamento deste dispositivo baseia-se na acumulação de água em um reservatório sobrelevado em relação ao nível da superfície livre do mar, a água acumulada então retorna ao mar, acionando turbinas hidráulicas de baixa queda que estão acopladas a geradores elétricos. Este trabalho faz uso da bibliometria, a qual é uma ferramenta estatística que permite quantificar a medição de índices de produção. Utilizando palavras-chave selecionadas, realizou-se um levantamento de artigos nas bases de dados online Science Direct, Scielo e Scholar, os arquivos encontrados passaram então por um processo de filtragem, a fim de limitar o estudo bibliométrico aos artigos de interesse, isto é, foram selecionados apenas estudos a respeito de dispositivos de galgamento enquanto conversores de energia das ondas do mar em energia elétrica. Por fim, executou-se a investigação dos documentos remanescentes sobre a óptica do estudo de produção e autoria, identificando o crescimento nas publicações acerca do assunto, os autores mais prolíferos e as instituições de filiação destes.
    Type of Medium: Online Resource
    ISSN: 2525-4782
    URL: Article
    DOI: 10.21575/25254782rmetg2020vol5n31295
    Language: Unknown
    Publisher: Revista Mundi
    Publication Date: 2020
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  • 5
    Online Resource
    Online Resource
    Bibliometric Study Applied to the Overtopping Wave Energy Converter Device
    Nan Yang Academy of Sciences Pte Ltd ; 2021
    In:  Sustainable Marine Structures Vol. 2, No. 1 ( 2021-02-07), p. 35-45
    Details
    In: Sustainable Marine Structures, Nan Yang Academy of Sciences Pte Ltd, Vol. 2, No. 1 ( 2021-02-07), p. 35-45
    Abstract: The present study aims to analyze the state of the art of scientific studies about the Overtopping device used to convert sea wave energy into electrical energy, by means the Bibliometric methodology. The development of this study took place through the selection of articles from conference proceedings, as well as national and international journals. The Bibliometric methodology consists of a statistical tool that allows quantifying the measurement of production indexes. Using selected keywords, it was conducted a survey of studies in the online databases of Science Direct, SciELO and Google Scholar. The works found then went through a filtering process, in order to limit the Bibliometric study only to studies about Overtopping devices as sea Wave Energy Converter (WEC). Finally, the investigation of these selected articles was carried out under the optics of production and authorship study, content study and study of bibliographic references. Where it was identified growth in publications related to the topic, methodologies used and, among other indicators, the authors most cited in the analyzed articles. The predominant keywords used were “Wave Energy Converter” and “Overtopping”. It was noted that Brazilian universities are leaders in the productivity, presenting more than 36% of the scientific production regarding Overtopping WECs.
    Type of Medium: Online Resource
    ISSN: 2661-3158
    URL: Article
    DOI: 10.36956/sms.v2i1.306
    Language: Unknown
    Publisher: Nan Yang Academy of Sciences Pte Ltd
    Publication Date: 2021
    detail.hit.zdb_id: 3106753-0
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  • 6
    Online Resource
    Online Resource
    Numerical Evaluation of the Hydropneumatic Power of the Oscillating Water Column Wave Energy Converter Submitted to Regular and Irregular Waves
    Universal Wiser Publisher Pte. Ltd ; 2021
    In:  Engineering Science & Technology ( 2021-10-09), p. 32-43
    Details
    In: Engineering Science & Technology, Universal Wiser Publisher Pte. Ltd, ( 2021-10-09), p. 32-43
    Abstract: The purpose of this study is to computationally analyze the hydropneumatic power available in the air duct of an Oscillating Water Column (OWC) Wave Energy Converter (WEC) device when subject to realistic sea state data (irregular waves) and when submitted to the regular waves representative of this sea state. The OWC WEC is mainly composed of a hydropneumatic chamber and an air duct where a turbine and electric generator are coupled. The chamber is open below the free surface while the duct is open to the atmosphere. The oscillating movement of the water-free surface inside the chamber causes the air to flow, moving the turbine and generating electricity. To execute this study, a bi-dimensional computational model was considered and numerical simulations of wave generation were carried out using ANSYS Fluent, which is a Computational Fluid Dynamics (CFD) software based on the Finite Volume Method (FVM). The Volume of Fluid (VOF) multi-phase model was applied in the treatment of the water-air interaction. To evaluate the average hydropneumatic power available in the duct, the static pressure, velocity, and air mass flow rate were monitored. The results were analyzed, showing that the available power is 250% greater when the device is subject to realistic irregular waves rather than subject to representative regular waves.
    Type of Medium: Online Resource
    ISSN: 2717-5243 , 2717-5235
    URL: Issue
    URL: Article
    DOI: 10.37256/est.312022
    DOI: 10.37256/est.3120221022
    Language: Unknown
    Publisher: Universal Wiser Publisher Pte. Ltd
    Publication Date: 2021
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  • 7
    Online Resource
    Online Resource
    Transformation of Water Wave Spectra into Time Series of Surface Elevation
    MDPI AG ; 2021
    In:  Earth Vol. 2, No. 4 ( 2021-11-22), p. 997-1005
    Details
    In: Earth, MDPI AG, Vol. 2, No. 4 ( 2021-11-22), p. 997-1005
    Abstract: Spectral wave modelling is widely used to simulate large-scale wind–wave processes due to its low computation cost and relatively simpler formulation, in comparison to phase-resolving or hydrodynamic models. However, some applications require a time-domain representation of sea waves. This article proposes a methodology to transform the wave spectrum into a time series of water surface elevation for applications that require a time-domain representation of ocean waves. The proposed method uses a generated phase spectrum and the inverse Fourier transform to turn the wave spectrum into a time series of water surface elevation. The consistency of the methodology is then verified. The results show that it is capable of correctly transforming the wave spectrum, and the significant wave height of the resulting time series is within 5% of that of the input spectrum.
    Type of Medium: Online Resource
    ISSN: 2673-4834
    URL: Article
    DOI: 10.3390/earth2040059
    Language: English
    Publisher: MDPI AG
    Publication Date: 2021
    detail.hit.zdb_id: 3036918-6
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  • 8
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    Geometrical Analysis of an Oscillating Water Column Converter Device Considering Realistic Irregular Wave Generation with Bathymetry
    MDPI AG ; 2023
    In:  Journal of Experimental and Theoretical Analyses Vol. 1, No. 1 ( 2023-09-19), p. 24-43
    Details
    In: Journal of Experimental and Theoretical Analyses, MDPI AG, Vol. 1, No. 1 ( 2023-09-19), p. 24-43
    Abstract: Given the increasing global energy demand, the present study aimed to analyze the influence of bathymetry on the generation and propagation of realistic irregular waves and to geometrically optimize a wave energy converter (WEC) device of the oscillating water column (OWC) type. In essence, the OWC WEC can be defined as a partially submerged structure that is open to the sea below the free water surface (hydropneumatic chamber) and connected to a duct that is open to the atmosphere (in which the turbine is installed); its operational principle is based on the compression and decompression of air inside the hydropneumatic chamber due to incident waves, which causes an alternating air flow that drives the turbine and enables electricity generation. The computational fluid dynamics software package Fluent was used to numerically reproduce the OWC WEC according to its operational principles, with a simplification that allowed its available power to be determined, i.e., without considering the turbine. The volume of fluid (VOF) multiphase model was employed to treat the interface between the phases. The WaveMIMO methodology was used to generate realistic irregular waves mimicking those that occur on the coast of Tramandaí, Rio Grande do Sul, Brazil. The constructal design method, along with an exhaustive search technique, was employed. The degree of freedom H1/L (the ratio between the height and length of the hydropneumatic chamber of the OWC) was varied to maximize the available power in the device. The results showed that realistic irregular waves were adequately generated within both wave channels, with and without bathymetry, and that wave propagation in both computational domains was not significantly influenced by the wave channel bathymetry. Regarding the geometric evaluation, the optimal geometry found, H1/Lo = 0.1985, which maximized the available hydropneumatic power, i.e., the one that yielded a power of 25.44 W, was 2.28 times more efficient than the worst case found, which had H1/L = 2.2789.
    Type of Medium: Online Resource
    ISSN: 2813-4648
    URL: Article
    DOI: 10.3390/jeta1010003
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
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  • 9
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    NEOTROPICAL CARNIVORES: a data set on carnivore distribution in the Neotropics
    Wiley ; 2020
    In:  Ecology Vol. 101, No. 11 ( 2020-11)
    Details
    In: Ecology, Wiley, Vol. 101, No. 11 ( 2020-11)
    Abstract: Mammalian carnivores are considered a key group in maintaining ecological health and can indicate potential ecological integrity in landscapes where they occur. Carnivores also hold high conservation value and their habitat requirements can guide management and conservation plans. The order Carnivora has 84 species from 8 families in the Neotropical region: Canidae; Felidae; Mephitidae; Mustelidae; Otariidae; Phocidae; Procyonidae; and Ursidae. Herein, we include published and unpublished data on native terrestrial Neotropical carnivores (Canidae; Felidae; Mephitidae; Mustelidae; Procyonidae; and Ursidae). NEOTROPICAL CARNIVORES is a publicly available data set that includes 99,605 data entries from 35,511 unique georeferenced coordinates. Detection/non‐detection and quantitative data were obtained from 1818 to 2018 by researchers, governmental agencies, non‐governmental organizations, and private consultants. Data were collected using several methods including camera trapping, museum collections, roadkill, line transect, and opportunistic records. Literature (peer‐reviewed and grey literature) from Portuguese, Spanish and English were incorporated in this compilation. Most of the data set consists of detection data entries (n = 79,343; 79.7%) but also includes non‐detection data (n = 20,262; 20.3%). Of those, 43.3% also include count data (n = 43,151). The information available in NEOTROPICAL CARNIVORES will contribute to macroecological, ecological, and conservation questions in multiple spatio‐temporal perspectives. As carnivores play key roles in trophic interactions, a better understanding of their distribution and habitat requirements are essential to establish conservation management plans and safeguard the future ecological health of Neotropical ecosystems. Our data paper, combined with other large‐scale data sets, has great potential to clarify species distribution and related ecological processes within the Neotropics. There are no copyright restrictions and no restriction for using data from this data paper, as long as the data paper is cited as the source of the information used. We also request that users inform us of how they intend to use the data.
    Type of Medium: Online Resource
    ISSN: 0012-9658 , 1939-9170
    URL: Issue
    URL: Article
    DOI: 10.1002/ecy.v101.11
    DOI: 10.1002/ecy.3128
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 1797-8
    detail.hit.zdb_id: 2010140-5
    SSG: 12
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  • 10
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    NEOTROPICAL ALIEN MAMMALS: a data set of occurrence and abundance of alien mammals in the Neotropics
    Wiley ; 2020
    In:  Ecology Vol. 101, No. 11 ( 2020-11)
    Details
    In: Ecology, Wiley, Vol. 101, No. 11 ( 2020-11)
    Abstract: Biological invasion is one of the main threats to native biodiversity. For a species to become invasive, it must be voluntarily or involuntarily introduced by humans into a nonnative habitat. Mammals were among first taxa to be introduced worldwide for game, meat, and labor, yet the number of species introduced in the Neotropics remains unknown. In this data set, we make available occurrence and abundance data on mammal species that (1) transposed a geographical barrier and (2) were voluntarily or involuntarily introduced by humans into the Neotropics. Our data set is composed of 73,738 historical and current georeferenced records on alien mammal species of which around 96% correspond to occurrence data on 77 species belonging to eight orders and 26 families. Data cover 26 continental countries in the Neotropics, ranging from Mexico and its frontier regions (southern Florida and coastal‐central Florida in the southeast United States) to Argentina, Paraguay, Chile, and Uruguay, and the 13 countries of Caribbean islands. Our data set also includes neotropical species (e.g., Callithrix sp., Myocastor coypus , Nasua nasua) considered alien in particular areas of Neotropics. The most numerous species in terms of records are from Bos sp. ( n = 37,782), Sus scrofa ( n = 6,730), and Canis familiaris ( n = 10,084); 17 species were represented by only one record (e.g., S yncerus caffer, Cervus timorensis, Cervus unicolor, Canis latrans ). Primates have the highest number of species in the data set ( n = 20 species), partly because of uncertainties regarding taxonomic identification of the genera Callithrix, which includes the species Callithrix aurita, Callithrix flaviceps, Callithrix geoffroyi, Callithrix jacchus, Callithrix kuhlii, Callithrix penicillata , and their hybrids. This unique data set will be a valuable source of information on invasion risk assessments, biodiversity redistribution and conservation‐related research. There are no copyright restrictions. Please cite this data paper when using the data in publications. We also request that researchers and teachers inform us on how they are using the data.
    Type of Medium: Online Resource
    ISSN: 0012-9658 , 1939-9170
    URL: Issue
    URL: Article
    DOI: 10.1002/ecy.v101.11
    DOI: 10.1002/ecy.3115
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 1797-8
    detail.hit.zdb_id: 2010140-5
    SSG: 12
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