Representing non-linear wave energy converters in coastal wave models

Luczko, Ewelina; Robertson, Bryson; Bailey, Helen; Hiles, Clayton E.; Buckham, Bradley J.

doi:10.1016/j.renene.2017.11.040

Cited by 12 publications

(13 citation statements)

References 9 publications

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“…as the equivalent linear damping coefficient that ensures the same power extraction per cycle as that defined by Equation (14). Because this damping coefficient depends on the chamber motion response, ξ 7 , the solution to Equation ( 7) is also weakly nonlinear and must be found iteratively for each combination of frequency and incident wave steepness, = 2A/λ.…”

Section: Potential Flow Modeling Of the Orifice Plate Damping-incompressible Flowmentioning

confidence: 99%

“…This failure has been noted by several authors and was studied in some detail by Sheng et al [13], who suggested replacing the zero-mass (zero-thickness) internal free surface with a light piston of small finite displacement, which makes the calculation of A ∞ jk non-singular. A number of other authors have also used this approach; recent examples include References [14][15][16]. However, there are two problems with this approach.…”

Section: Numerical Potential Flow Solutionsmentioning

confidence: 99%

“…This involves creating a new geometry for the device that is reflected about the z = 0 plane and submerged to the original water depth, h, in a fluid of depth 2h. In this way, we avoid any ad-hoc parameters associated with the finite-thickness plate methods that have been proposed in the past for solving this issue [13][14][15][16]. For CFD methods, the main issues are associated with properly resolving the two-phase fluid interaction between the water and air inside the chamber, in particular if the air phase is considered to be compressible.…”

Section: Introductionmentioning

confidence: 99%

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Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column

Bingham

Nielsen

et al. 2021

Energies

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This paper reports on an ongoing international effort to establish guidelines for numerical modeling of wave energy converters, initiated by the International Energy Agency Technology Collaboration Program for Ocean Energy Systems. Initial results for point absorbers were presented in previous work, and here we present results for a breakwater-mounted Oscillating Water Column (OWC) device. The experimental model is at scale 1:4 relative to a full-scale installation in a water depth of 12.8 m. The power-extracting air turbine is modeled by an orifice plate of 1–2% of the internal chamber surface area. Measurements of chamber surface elevation, air flow through the orifice, and pressure difference across the orifice are compared with numerical calculations using both weakly-nonlinear potential flow theory and computational fluid dynamics. Both compressible- and incompressible-flow models are considered, and the effects of air compressibility are found to have a significant influence on the motion of the internal chamber surface. Recommendations are made for reducing uncertainties in future experimental campaigns, which are critical to enable firm conclusions to be drawn about the relative accuracy of the numerical models. It is well-known that boundary element method solutions of the linear potential flow problem (e.g., WAMIT) are singular at infinite frequency when panels are placed directly on the free surface. This is problematic for time-domain solutions where the value of the added mass matrix at infinite frequency is critical, especially for OWC chambers, which are modeled by zero-mass elements on the free surface. A straightforward rational procedure is described to replace ad-hoc solutions to this problem that have been proposed in the literature.

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Section: Potential Flow Modeling Of the Orifice Plate Damping-incompressible Flowmentioning

confidence: 99%

Section: Numerical Potential Flow Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column

Bingham

Nielsen

et al. 2021

Energies

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“…Even though the wave energy technology has not been widely implemented as a commercial operation, there are a large number of scholars and research institutes who conducted various designs of wave energy converters or developed new analytical models [15][16][17][18][19][20][21]. However, the economic analysis of the wave energy and operational decisions of energy suppliers and consumers (e.g., electricity plant and ports) have rarely been touched upon.…”

Section: Introductionmentioning

confidence: 99%

Development of Green Ports with the Consideration of Coastal Wave Energy

Zhu

et al. 2018

Sustainability

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Considering the rapid development of maritime logistics, the reduction of energy consumption at ports is important in the sustainable development of global economics. Oceans have been known as sources of clean energy, and wave energy is attracting more and more attention from both scholars and practitioners. Even though much effort has been made to develop advanced technologies of wave energy, it is still not clear how ports and electricity plants will evaluate its performance and make decisions on the investment. This paper analyzed the decision framework of ports and electricity plants that can decide how much to invest into wave energy converters, by considering the uncertainty of wave energy supply. A mathematical model is developed to obtain the optimal decisions of a single port and electricity plant for different cases. We show that in most cases, the port has a no lower motivation for investing in the wave energy than the electricity plant. Our theoretical analyses also shed light on the impacts of the parameters on the optimal decisions. Considering the difficulty in estimating the uncertainty of wave energy supply, we extend the distribution-free model to our problem which can make our model more practical.

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“…As an expansion of the current WEC array modelling techniques, non-linearity in the WEC array model is studied by [3,80]. In [81], rapid phase oscillation is removed and a modeling method for large arrays is investigated.…”

Section: Modeling the Hydrodynamic Interaction For Wec Arraymentioning

confidence: 99%

Optimization and Control of Arrays of Wave Energy Converters

Lyu¹

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Representing non-linear wave energy converters in coastal wave models

Cited by 12 publications

References 9 publications

Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column

Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column

Development of Green Ports with the Consideration of Coastal Wave Energy

Optimization and Control of Arrays of Wave Energy Converters

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