Aplicação Do Método Design Construtal Na Avaliação Numérica Da Potência Hidropneumática De Um Dispositivo Conversor De Energia Das Ondas Do Mar Do Tipo Coluna De Água Oscilante Com Região De Transição Trapezoidal

Lima, Yuri Theodoro Barbosa de; Rocha, Luíz Alberto Oliveira; Gomes, Mateus das Neves; Santos, Elizaldo Domingues dos

doi:10.5380/rber.v6i3.52983

Cited by 6 publications

(5 citation statements)

References 4 publications

(7 reference statements)

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“…Regarding the computational domain, the OWC WEC was inserted in the wave channel in which the bottom of the channel presented bathymetry (see Figure 5b), according to the results from the bathymetry influence study. Furthermore, as recommended by De Lima [9], the OWC WEC was placed at 1.5λ from the beginning of the wave channel. Regarding the boundary conditions, they were the atmospheric pressure (green line), wall (continuous black line), hydrostatic profile (blue line), and velocity inlet (red line), which, as in the bathymetry influence study, it was subdivided into 14 segments of size h/14, as recommended by Machado et al [33].…”

Section: Geometric Optimization Of Owc Wecmentioning

confidence: 99%

“…Regarding the spatial discretization, a stretched mesh was used for the regions both before and after the device [40], as performed in the bathymetry influence study. For the discretization of the device, square-shaped cells with a size of 0.1 m were used and the thickness of its wall was 0.1 m, as recommended by De Lima [9]. As for temporal discretization, the time step ∆t = 0.05 s was used [33].…”

Section: Geometric Optimization Of Owc Wecmentioning

confidence: 99%

“…Figures 8a and 8b present, respectively, the comparison between the free surface elevation of realistic irregular waves at positions x = 0 m and 71.096893 m. It is worth noting that these positions were chosen for evaluation due to the fact that the generation of realistic irregular waves occurred at x = 0 m, whereas, at x = 71.096893 m, the OWC WEC was inserted into the wave channel, as recommended by De Lima [9].…”

Section: Study Of Bathymetry Influence In the Generation And Propagat...mentioning

confidence: 99%

“…Due to current and future needs in terms of using renewable energy sources, as well as the energy potential of the Brazilian coast, knowledge of how sea wave energy can be converted into electrical energy is essential, so that this type of technology can be used fully and sustainably. One of the methods to develop knowledge is through numerical simulation, which is a tool to study wave energy converter (WEC) devices, which in turn allows the construction of these devices (after testing), with the overall aim of their use in an optimized way with regard to energy conversion [8,9]. Regarding computational modeling as applied to OWC WEC devices, most studies approach regular waves (such as [10][11][12]).…”

Section: Introductionmentioning

confidence: 99%

“…One of the methods to develop knowledge is through numerical simulation, which is a tool to study wave energy converter (WEC) devices, which in turn allows the construction of these devices (after testing), with the overall aim of their use in an optimized way with regard to energy conversion [8,9]. Regarding computational modeling as applied to OWC WEC devices, most studies approach regular waves (such as [10][11][12]). However, some recent research has been developed considering the incidence of irregular waves on OWC converters (such as [13][14][15]).…”

Section: Introductionmentioning

confidence: 99%

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Geometrical Analysis of an Oscillating Water Column Converter Device Considering Realistic Irregular Wave Generation with Bathymetry

Mocellin,

Maciel,

Oleinik

et al. 2023

JETA

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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.

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Section: Geometric Optimization Of Owc Wecmentioning

confidence: 99%

Section: Geometric Optimization Of Owc Wecmentioning

confidence: 99%

Section: Study Of Bathymetry Influence In the Generation And Propagat...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Geometrical Analysis of an Oscillating Water Column Converter Device Considering Realistic Irregular Wave Generation with Bathymetry

Mocellin,

Maciel,

Oleinik

et al. 2023

JETA

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Geometric Analysis through the Constructal Design of a Sea Wave Energy Converter with Several Coupled Hydropneumatic Chambers Considering the Oscillating Water Column Operating Principle

et al. 2021

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The work presents a numerical study of a wave energy converter (WEC) device based on the oscillating water column (OWC) operating principle with a variation of one to five coupled chambers. The main objective is to evaluate the influence of the geometry and the number of coupled chambers to maximize the available hydropneumatic power converted in the energy extraction process. The results were analyzed using the data obtained for hydropneumatic power, pressure, mass flow rate, and the calculated performance indicator’s hydropneumatic power. The Constructal Design method associated with the Exhaustive Search optimization method was used to maximize the performance indicator and determine the optimized geometric configurations. The degrees of freedom analyzed were the ratios between the height and length of the hydropneumatic chambers. A wave tank represents the computational domain. The OWC device is positioned inside it, subject to the regular incident waves. Conservation equations of mass and momentum and one equation for the transport of the water volume fraction are solved with the finite volume method (FVM). The multiphase model volume of fluid (VOF) is used to tackle the water–air mixture. The analysis of the results took place by evaluating the performance indicator in each chamber separately and determining the accumulated power, which represents the sum of all the powers calculated in all chambers. The turbine was ignored, i.e., only the duct without it was analyzed. It was found that, among the cases examined, the device with five coupled chambers converts more energy than others and that there is an inflection point in the performance indicator, hydropneumatic power, as the value of the degree of freedom increases, characterizing a decrease in the value of the performance indicator. With the results of the hydropneumatic power, pressure, and mass flow rate, it was possible to determine a range of geometry values that maximizes the energy conversion, taking into account the cases of one to five coupled chambers and the individual influence of each one.

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Analysis of the Geometric Constraints Employed in Constructal Design for Oscillating Water Column Devices Submitted to the Wave Spectrum through a Numerical Approach

Gomes

Deus

Santos

et al. 2019

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This paper aims a numerical investigation about the fluid dynamic behavior of an oscillating water column (OWC) wave energy converter (WEC) into electrical energy. Constructal design is employed to perform a geometric evaluation of an OWC WEC submitted a Pierson-Moskowitz wave spectrum. The objective function is to maximize the energy conversion. The hydropneumatic chamber volume (VHC) and the total OWC volume (VT) are adopted as geometric constraints. In the first stage, the values are constant during the maximization process. However, in a second stage they are changed according to the constraint variation (CV). One of the goals is to analyze the influence of the choice of this geometric constraints value on the OWC performance in relation to the wave spectrum. For this purpose, are considered three different scenarios: 1)VHydis equal to the minimum incident wavelength (λmin), that is relative to the maximum frequency of the wave spectrum times the significant wave height (HS); 2)VHydis equal to the peak incident wavelength (λpeak), that is relative to peak frequency of the wave spectrum times the significant wave height (HS); and 3)VHydis equal to the maximum incident wavelength (λmax), that is relative to minimum frequency of the wave spectrum times the significant wave height (HS). To do so, constructal design is employed varying the degree of freedom (DOF)H1/L(ratio between the height and length of OWC chamber), while the others DOF’sH2/l(ratio between height and length of chimney) andH3(lip submergence), are kept fixed. It is employed a Pierson-Moskowitz wave spectrum with significant period (TS) equal to 7.5 s and significant wave height (HS) equal to 1.5 m. For the numerical solution it is used the computational fluid dynamic (CFD) code, based on the finite volume method (FVM). The multiphase volume of fluid (VOF) model is applied to tackle with the water-air interaction. The computational domain is represented by the OWC WEC coupled with the wave tank. The results showed that whenCV= 2.25 forλmaxand (H1/L)O= 0.2152 the highest average for power was obtained, nearly 18,000 W. While forλminand (H1/L)O= 0.2193 it was smaller than 1,000 W. Besides, it was obtained a theoretical recommendation about the geometric constraints employed for the constructal design application, aiming the maximization of the OWC energy conversion from the incident wave spectrum.

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Aplicação Do Método Design Construtal Na Avaliação Numérica Da Potência Hidropneumática De Um Dispositivo Conversor De Energia Das Ondas Do Mar Do Tipo Coluna De Água Oscilante Com Região De Transição Trapezoidal

Cited by 6 publications

References 4 publications

Geometrical Analysis of an Oscillating Water Column Converter Device Considering Realistic Irregular Wave Generation with Bathymetry

Geometrical Analysis of an Oscillating Water Column Converter Device Considering Realistic Irregular Wave Generation with Bathymetry

Geometric Analysis through the Constructal Design of a Sea Wave Energy Converter with Several Coupled Hydropneumatic Chambers Considering the Oscillating Water Column Operating Principle

Analysis of the Geometric Constraints Employed in Constructal Design for Oscillating Water Column Devices Submitted to the Wave Spectrum through a Numerical Approach

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