Computational Modeling of a Regular Wave Tank

Gomes, Mateus das Neves; Isoldi, Liércio André; Olinto, Cláudio Rodrigues; Rocha, Luíz Alberto Oliveira; Souza, Jeferson Ávila

doi:10.1109/mcsul.2009.27

Cited by 15 publications

(7 citation statements)

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“…No trabalho realizado, a onda incidente é gerada no lado esquerdo do tanque de ondas, local onde o gerador de ondas numérico é posicionado, como pode ser observado na Para a geração da onda regular, a Metodologia Função é aplicada [21]. Esta metodologia consiste na criação de uma função definida pelo usuário, UDF (User Define Function), no FLUENT.…”

Section: Domínio Computacionalunclassified

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Análise numérica e geométrica com design construtal da região de transição para um dispositivo do tipo coluna de água oscilante (CAO)

et al. 2017

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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 semicircular na região de transição do dispositivo CAO, situada entre a câmara hidropneumática e a chaminé do mesmo. Os resultados são comparados através do valor de potência hidropneumática, para as diferentes configurações geométricas investigadas. O Design Construtal, atrelado ao método de busca exaustiva, foi empregado para definir as dimensões que maximizam a potência hidropneumática. Os graus de liberdade estudados foram o raio (r), a razão entre altura e comprimento da chaminé de saída de ar da câmara CAO (H2/l) e a razão entre a altura e o comprimento da câmara CAO (H1/L). 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 obtidos mostram que a máxima potência hidropneumática de 190,61W é obtida para os graus de liberdade H1/L = 0,1346 e r = 7,54, o caso com a mais baixa potência hidropnemática, apresenta 57,73W. Este resultado mostra um ganho de 69,90% em relação ao caso com menor desempenho de potência hidropneumática.

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Section: Domínio Computacionalunclassified

“…A validação desta metodologia pode ser encontrada na literatura como em [17,21], [18,29], Ramalhais (2011) [19], Horko (2007) [28] e Gomes (2010) [30].…”

Section: Verificação Do Modelo Computacionalunclassified

Análise numérica e geométrica com design construtal da região de transição para um dispositivo do tipo coluna de água oscilante (CAO)

et al. 2017

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“…2, the wave maker is placed in the left side of the wave tank. For the regular wave generation it was employed the called Function [19]. This methodology consists of applying the horizontal (u) and vertical (w) components of wave velocity as boundary conditions (velocity inlet) of the computational model, by means a User Defined Function (UDF) in the FLUENT ® software.…”

Section: Boundary Conditionsmentioning

confidence: 99%

“…Thus, the model is composed by the continuity, momentum and volume fraction equations, which are respectively given by [18,19]:…”

Section: Mathematical and Numerical Modelsmentioning

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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“…In recent decades, flexible floating membrane breakwaters are preferred popularly as they are easy to carry, inexpensive, reusable, rapidly deployable and removable, and less environmental International Conference on Mechanics and Civil Engineering (ICMCE 2014) impacts [7] [8]. Although Bragg resonance is investigated by using diffirent analytical methods, it is not simulated by using CFD method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulating of the Interaction of Vertical Fixed Multiple Membranes with Gravity Wave

Tao¹,

Wu²,

Mei³

et al. 2014

Proceedings of the 2014 International Conference on Mechanics and Civil Engineering

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Abstract. In deep sea or temporary application, the floating breakwater should be best used to attenuate the surface wave. But the most difficulty of floating breakwater is to decrease long wave length wave. Bragg resonance condition appears while incident surface water wavelengths are approximately twice the periodic structure wavelengths, and large amounts of incident wave energy are reflected. In recent years, flexible membrane structure, with its numerous advantages, has attracted the attention of the coastal and ocean engineers and researchers. Although Bragg resonance is investigated by using diffirent analytical methods, it is not found by using CFD method. Therefore, in this paper, we use commercial software code FLUENT to numerical simulating the interaction of surface grivaty wave with multiple veitically fixed membranes with constant gaps. At the beginning, we verified the numerical technology by simulating the wave making and the interaction of wave with single membrane; then, we computed 4 diffirent length veitically fixed multiple membranes. The results show that the transmission coefficient is small and decline obviously with the membrane lengthened when incident surface water wavelengths are approximately twice the membrane gap. However, we need to simulate more wave lengthes to find whether there is the strong reflection induced by Bragg resonance. The works in this paper are the base about more studies on Bragg resonance being applied to floating breakwater.

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Computational Modeling of a Regular Wave Tank

Cited by 15 publications

References 1 publication

Análise numérica e geométrica com design construtal da região de transição para um dispositivo do tipo coluna de água oscilante (CAO)

Análise numérica e geométrica com design construtal da região de transição para um dispositivo do tipo coluna de água oscilante (CAO)

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

Numerical Simulating of the Interaction of Vertical Fixed Multiple Membranes with Gravity Wave

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