3D unsteady flow simulation in an OWC wave converter plant

Marjani, Abdellatif El; Castro, Francisco; Bahaji, M.; Filali, Bilal

doi:10.24084/repqj04.452

Cited by 14 publications

(8 citation statements)

References 4 publications

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“…A equação analítica da superfície livre é definida por: Neste trabalho foram avaliadas a vazão mássica (na saída da chaminé), a pressão (no interior da câmara), a eficiência e a potência hidropneumática. Os valores médios foram calculados empregando a média aritmética para problemas transientes Root Mean Square (RMS) (Marjani et al, 2006):…”

Section: Resultsunclassified

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

Lima¹,

Rocha²,

Gomes³

et al. 2017

R. bras. Ener. Renov.

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O presente trabalho apresenta um estudo numérico bidimensional sobre a região de transição entre a câmara hidropneumática e a chaminé de um dispositivo conversor do tipo Coluna de Água Oscilante (CAO). O objetivo é maximizar a potência hidropneumática, considerando uma geometria trapezoidal na região de transição do dispositivo CAO, situada entre a câmara hidropneumática e a chaminé. Os resultados são comparados através do valor de potência hidropneumática obtido para as diferentes configurações geométricas. O Design Construtal, associado ao método de busca exaustiva, foi empregado para definir a geometria que maximiza a potência hidropneumática. Os graus de liberdade estudados foram o ângulo de inclinação da parede entre a câmara hidropneumática e a chaminé do dispositivo CAO (α), a razão entre altura e comprimento da chaminé do dispositivo (H2/l) e a profundidade de submersão do dispositivo (H3). O domínio computacional é representado por um tanque de ondas com o dispositivo CAO acoplado. O software FLUENT foi empregado para a solução numérica das equações, baseada no Método dos Volumes Finitos (MVF). A construção da geometria e a geração da malha foram realizadas no software GAMBIT. Na interação entre as fases ar e água, foi aplicado o método Volume of Fluid (VOF). Os resultados encontrados mostram um potência de 587,31 W para o caso de melhor desempenho, enquanto que 46,14 W determinam a potência para o caso de mais baixo desempenho. Estes resultados apresentam uma diferença de 92,14 % em relação ao mais alto e o mais baixo desempenho de potência hidropneumática.Palavras-chave: Design Construtal, Trapezoidal, CAO.

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Section: Resultsunclassified

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

Lima¹,

Rocha²,

Gomes³

et al. 2017

R. bras. Ener. Renov.

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“…It was calculated the average values of the hydropneumatic power, the mass flow rate and the pressure using the RMS statistical technique [28]:…”

Section: Resultsmentioning

confidence: 99%

Constructal Design Applied to the Study of the Geometry and Submergence of an Oscillating Water Column

Lorenzini¹,

Lara²,

Rocha³

et al. 2015

IJHT

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The wave energy conversion into electricity has been increasingly studied in the last years. There are several converters, among them the Oscillating Water Column (OWC) device. Constructal Design and a computational modeling were applied to a geometric optimization of an Oscillating Water Column Wave Energy Converter, device that transforms the energy of incident waves into electrical energy. The aim is to convert maximum electrical power varying and analyzing the influence of the three degrees of freedom (DoFs): H1/L (ratio between the height and length of OWC chamber), H2/l (ratio between height and length of chimney), and H3 (submergence, which are related to the chamber and the chimney of the device, and the location in water depth respectively. Besides there are two constraints (fixed parameters): total area of the OWC chamber (A1) and total area of OWC device (A2). The computational domain consists of an OWC inserted in a tank where regular waves in a real scale are generated. The mesh was developed in ANSYS ICEM ® . The computational fluid dynamics code ANSYS FLUENT ® was used to find the numerical solution which is based on Finite Volume Method (FVM). The multiphasic Volume of Fluid (VOF) model was applied to tackle with the water-air interaction. The results led to a theoretical recommendation about the OWC geometry and its submergence which maximizes the device performance, since a redistribution of the OWC geometry and a variation in the value of its submergence could improve the hydropneumatic power from 10.7 W to 190.8 W for ratios H1/L, H2/l and H3 equal 0.135, 6.0 and 9.5 m respectively, and incident waves characterized by a period of 5 s and wave length of 37.6 m.

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“…where n represents the quantity to be calculated on the average RMS. For further details on Equations ( 2)-( 4), it is recommended to consult Marjani et al [30].…”

Section: Formulation Of Pressure and Mass Flow Rate Using The Rms Met...mentioning

confidence: 99%

Study of the Geometry of an Oscillating Water Column Device with Five Chambers Coupled under Regular Waves through the Constructal Design Method

de Lima,

Isoldi,

dos Santos

et al. 2024

Fluids

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This research conducts a numerical study of a wave energy converter (WEC) device with five coupled hydropneumatic chambers, operating based on the principle of an oscillating water column (OWC). A turbine was not included, only considering the tube without it. The computational domain was defined by a wave channel housing an OWC device subjected to regular incident waves. The central objective was to assess the impact of chamber geometry on maximizing the total hydropneumatic power in energy conversion. The numerical simulations consider the pressure, mass flow rate, and total hydropneumatic power, with the latter being the performance indicator. To determine the geometries to be analyzed, the Constructal Design method was employed in conjunction with the exhaustive search optimization method to maximize the performance indicator. The degrees of freedom defined were the ratios between the height (Hn) and the length (Ln) of the hydropneumatic chambers (Hn/Ln, where n varies from one to five). Based on the results of the mass flow rate and pressure, their influence on power was evaluated. It was observed that the influence of the degrees of freedom on the pressure difference, mass flow rate, and hydrodynamic power was quite similar, displaying an increase for low ratios of Hn/Ln up to a maximum magnitude and followed by a decrease in magnitude. The best performance was achieved for the geometric configuration with Hn/Ln = 0.2613 (Hn = 5.0625 m and Ln = 15.8219 m), representing an improvement of 98.6% compared to the worst case analyzed.

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3D unsteady flow simulation in an OWC wave converter plant

Cited by 14 publications

References 4 publications

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

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

Constructal Design Applied to the Study of the Geometry and Submergence of an Oscillating Water Column

Study of the Geometry of an Oscillating Water Column Device with Five Chambers Coupled under Regular Waves through the Constructal Design Method

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