Numerical evaluation of the power output of an oscillating water column wave energy converter installed in the southern Brazilian coast

Lisboa, Rodrigo C.; Teixeira, Paulo R.F.; Torres, Fernando R.; Didier, Éric

doi:10.1016/j.energy.2018.08.079

Cited by 20 publications

(7 citation statements)

References 26 publications

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“…The wave motion is generated by imposing a velocity profile at the left surface of the wave channel (blue line), where the JONSWAP wave spectrum is used. The mean water level (MWL) is h = 10.00 m, and the wave characteristics were obtained from studies of [42][43][44], where the significant wave height and the peak period are, respectively, HS = 1.50 m and TP = 7.50 s (thus, the peak wavelength LP = 65.40 m), minimum period Tmin = 4.50 s, maximum period Tmax = 12.50 s and was used 12 wave components.…”

Section: Mathematical Modelingmentioning

confidence: 99%

Constructal Design of a Two Ramps Overtopping Wave Energy Converter Integrated into a Breakwater: Effect of the Vertical Distance between the Ramps over its Performance

Martins

Goulart

Santos

et al. 2022

DDF

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A two-dimensional numerical study about the influence of a vertical distance between two ramps of an Overtopping Device Wave Energy Converter (OTD-WEC) integrated into a breakwater in the city of São José do Norte, Rio Grande do Sul, Brazil was analyzed. The main purpose was to evaluate the influence of the vertical distance between the two ramps (Hg) of OTD-WEC, on the average overtopping dimensionless flow () using the Constructal Design for the geometric evaluation defining: 1) degree of freedom, (Hg), and 2) constraints, horizontal distance between the ramps (Lg), ratio between the height and length of the ramps (H1/L1 and H2/L2), area as a function of the wave parameters (Awave), areas of the ramps (Ar,i), maximum ramp height (fixed as half of the significant wave height (HS/2) at the MWL) and area fractions of the ramps (φi). The equations of conservation of mass, momentum, and an equation for the transport of volumetric fraction were solved using the Finite Volume Method (FVM). The multiphase model Volume of Fluid (VOF) was applied for the air-water interaction. The results showed that, in general, lower values of the vertical distance between the ramps (Hg) led to higher values of the average overtopping dimensionless flow (). Moreover, the geometric evaluation of the degree of freedom Hg through the Constructal Design method proved to be an important tool because some configuration of the ramps of the overtopping device facilitated the flow of water to the reservoir of the device, and others made it difficult. The maximum value of the average overtopping dimensionless flow was max = 0.044, with a difference of 2.23% for the value obtained with empirical equation found in the literature, for the vertical distance equal to Hg = 0.10.

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Section: Mathematical Modelingmentioning

confidence: 99%

Constructal Design of a Two Ramps Overtopping Wave Energy Converter Integrated into a Breakwater: Effect of the Vertical Distance between the Ramps over its Performance

Martins

Goulart

Santos

et al. 2022

DDF

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“…Therefore, to generate numerical waves with lower computational cost, UDFs have been employed with a simpler approach. In this procedure, horizontal and vertical components of wave velocity, obtained from the velocity potential, are applied as boundary conditions [25][26][27][28][29][30][31][32]. To achieve results in agreement with real ocean waves and sea states, irregular waves have also been thoroughly studied.…”

Section: Introductionmentioning

confidence: 99%

“…Though the authors found that the proposed computational model, using discrete data as velocity boundary conditions for numerical waves generation, could be satisfactorily applied, it was not validated against experimental results. Lisboa et al [30] numerically analyzed the available power of an OWC device fixed on a breakwater, with a Wells turbine, installed on the south coast of Brazil. An analysis of the wave occurrence in the region was carried out in order to determine the significant parameters used in the numerical analysis.…”

Section: Introductionmentioning

confidence: 99%

Verification and Validation of a Methodology to Numerically Generate Waves Using Transient Discrete Data as Prescribed Velocity Boundary Condition

Maciel

Fragassa

Machado

et al. 2021

JMSE

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This work presents a two-dimensional numerical analysis of a wave channel and a oscillating water column (OWC) device. The main goal is to validate a methodology which uses transient velocity data as a means to impose velocity boundary condition for the generation of numerical waves. To achieve this, a numerical wave channel was simulated using regular waves with the same parameters as those used in a laboratory experiment. First, these waves were imposed as prescribed velocity boundary condition and compared with the analytical solution; then, the OWC device was inserted into the computational domain, aiming to validate this methodology. For the numerical analysis, computational fluid dynamics ANSYS Fluent software was employed, and to tackle with water–air interaction, the nonlinear multiphase model volume of fluid (VOF) was applied. Although the results obtained through the use of discrete data as velocity boundary condition presented a little disparity; in general, they showed a good agreement with laboratory experiment results. Since many studies use regular waves, there is a lack of analysis with ocean waves realistic data; thus, the proposed methodology stands out for its capacity of using realistic sea state data in numerical simulations regarding wave energy converters (WECs).

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“…However, chamber height tests indicate little influence over the performance of the device. Recently, Lisboa et al [26] adopted the general configuration proposed in Teixeira et al [8] for the numerical analyzes of an OWC installed in a breakwater on the southern Brazilian coast using Fluent software. This study also adds a seabed ramp before the device.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Influence of Geometry on a Large Scale Onshore Oscillating Water Column Device with Associated Seabed Ramp

Letzow¹,

Lorenzini²,

Barbosa³

et al. 2020

IJDNE

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The current study aims to perform a geometrical investigation of an onshore Oscillating Water Column (OWC) on a large scale. The Constructal Design method is employed, aiming to maximize its available power. The OWC is subjected to two constraints (areas of the chamber and ramp below the chamber); and three degrees of freedom: height/length ratio of the chamber (H1/L1), height/length ratio of the ramp (H2/L2), and submersion of the frontal wall of the chamber (H3). A laminar, unsteady, incompressible, and two-phase flow was adopted, solving conservation equations of mass, momentum, and transport of water-air volume fraction using Finite Volume Method (FVM) and Volume of Fluid (VOF) model. The global optimal geometry led to a twice maximized available power 37.3% higher than the best case without the seabed ramp below the chamber and seven times better than the worst case. Concerning the sensibility of geometry, results indicated that the chamber geometry, given by ratio H1/L1, over the available power (P) was strongly affected by the ramp ratio H2/L2. Moreover, the behavior of the effect of H2/L2 over the once maximized available power (Pm) and corresponding optimal shape of the chamber, (H1/L1)o, changed dramatically for two different magnitudes of H3 investigated.

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Numerical evaluation of the power output of an oscillating water column wave energy converter installed in the southern Brazilian coast

Cited by 20 publications

References 26 publications

Constructal Design of a Two Ramps Overtopping Wave Energy Converter Integrated into a Breakwater: Effect of the Vertical Distance between the Ramps over its Performance

Constructal Design of a Two Ramps Overtopping Wave Energy Converter Integrated into a Breakwater: Effect of the Vertical Distance between the Ramps over its Performance

Verification and Validation of a Methodology to Numerically Generate Waves Using Transient Discrete Data as Prescribed Velocity Boundary Condition

Numerical Analysis of the Influence of Geometry on a Large Scale Onshore Oscillating Water Column Device with Associated Seabed Ramp

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