Power Absorption Modeling and Optimization of a Point Absorbing Wave Energy Converter Using Numerical Method

Pastor, Jeremiah; Liu, Yucheng

doi:10.1115/1.4027409

Cited by 52 publications

(20 citation statements)

References 14 publications

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“…(2b) 3 Alternative tools include ANSYS AQWA ( [33,50]) and WAMIT ( [36,45,47,[51][52][53]). Spring coefficient is chosen such that the undamped system is at resonance at respectively kr = 1.0 (Case A), and kr = 1.5 (Case B).…”

Section: Fundamentalsmentioning

confidence: 99%

Shape optimization of wave energy converters for broadband directional incident waves

Esmaeilzadeh

Alam

2019

Ocean Engineering

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Here, through a systematic methodology and the use of high performance computing, we calculate the optimum shape for a wave energy converter under the action of incident waves of (i) monochromatic unidirectional, (ii) monochromatic directional, (iii) polychromatic unidirectional and (iv) polychromatic directional (with both directional symmetry and asymmetry). As a benchmark for our study, without loss of generality, we consider a submerged planar pressure differential wave energy converter, and use Genetic Algorithm to search through a wide range of shapes. A new parametric description of absorber shape based on Fourier decomposition of geometrical shapes is introduced, and for each shape hydrodynamic coefficients are calculated, optimum power take-off parameters are obtained, and overall efficiency is determined. We show that an optimum geometry of the absorber plate can absorb a significantly higher energy (in some cases few times higher) when compared to a circular shape of the same area. Specifically, for a unidirectional incident wave, the optimum shape, as expected, is obtained to be the most elongated shape. For directional incident waves, a butterfly-shape is the optimum geometry whose details depend on not only the amplitude and direction of incident wave components, but also the relative phases of those components. For the latter effect, we find an optimally averaged profile through a statistical analysis.

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Section: Fundamentalsmentioning

confidence: 99%

Shape optimization of wave energy converters for broadband directional incident waves

Esmaeilzadeh

Alam

2019

Ocean Engineering

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“…Accurate three-dimension (3D) theoretical models are hindered by the complex irregular shape of the Duck. Numerical boundary element methods (BEMs), such as the WAMIT software, are widely used in the design stages [7,19,20]. However, this method is based on the linear wave theory, hence will be limited within small wave steepness conditions.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study of the Solo Duck Wave Energy Converter

Yao

Sun

et al. 2019

Energies

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The Edinburgh Duck is one of the highly-efficient wave energy converters (WECs). Compared to the spine-connected Duck configuration, the solo Duck will be able to use the point absorber effect to enhance its power capture performance. In this paper, a 3D computational fluid dynamic (CFD) model is developed to predict the hydrodynamic performance of the solo Duck WEC in regular waveswithin a wide range ofwave steepness until the Duck capsizes. A set of experiments was designed to validate the accuracy of the CFD model. Boundary element method (BEM) simulations are also performed for comparison. CFD results agree well with experimental results and the main difference comes from the friction in the mechanical transmission system. CFD results also agree well with BEM results and differences appear at large wave steepness as a result of two hydrodynamic nonlinear factors: the nonlinear waveform and the vortex generation process. The influence of both two nonlinear factors iscombined to be quantitatively represented by the drag torque coefficient.The vortex generation process is found to cause a rapid drop of the pressure force due to the vortexes taking away the kinetic energy from the fluid.

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“…Much work, both theoretical [13][14][15][16] and experimental [17][18][19], has been accomplished to maximize the power absorption and increase the force in the connection line for this type of WEC. An optimal WEC with high power output and high survivability will have high mean forces and low peak forces.…”

Section: Introductionmentioning

confidence: 99%

Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves

Sjökvist

Göteman

2017

Energies

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Abstract:The focus of this paper is the survivability of wave energy converters (WECs) in extreme waves and tsunamis, using realistic WEC parameters. The impact of a generator damping factor has been studied, and the peak forces plotted as a function of wave height. The paper shows that an increased damping decreases the force in the endstop hit, which is in agreement with earlier studies. However, when analyzing this in more detail, we can show that friction damping and velocity dependent generator damping affect the performance of the device differently, and that friction can have a latching effect on devices in tsunami waves, leading to higher peak forces. In addition, we study the impact of different line lengths, and find that longer line lengths reduce the endstop forces in extreme regular waves, but on the contrary increase the forces in tsunami waves due to the different fluid velocity fields.

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Power Absorption Modeling and Optimization of a Point Absorbing Wave Energy Converter Using Numerical Method

Cited by 52 publications

References 14 publications

Shape optimization of wave energy converters for broadband directional incident waves

Shape optimization of wave energy converters for broadband directional incident waves

Numerical and Experimental Study of the Solo Duck Wave Energy Converter

Peak Forces on Wave Energy Linear Generators in Tsunami and Extreme Waves

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