Geometrical investigation of a U-shaped oscillating water column wave energy device

Ning, Dezhi; Guo, Baoming; Wang, Rong-quan; Vyzikas, Thomas; Greaves, Deborah

doi:10.1016/j.apor.2020.102105

Cited by 33 publications

(19 citation statements)

References 36 publications

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“…Thus, the pressure can be computed by

\begin{matrix} true \\ right p = - ρ g z - ρ \frac{\partial ϕ}{\partial t} - \frac{ρ}{2} {false(\nabla ϕ false)}^{2} . \end{matrix}

Currently, only a few software packages are based on the FNPF theory, for example, the high‐order boundary element method of Ning et al . [104, 105]. Further assuming the wave height is much smaller than the wavelength (

H ≪ λ

) and the device motion is small, linear potential flow (LPF) theory can be applied to solve the Laplace and linear Bernoulli equations in Figure 6.…”

Section: Wave Energy Technology Principlesmentioning

confidence: 99%

A review of wave energy technology from a research and commercial perspective

Guo

Ringwood

2021

IET Renewable Power Gen

113

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Although wave energy prototypes have been proposed for more than 100 years, they have still not reached full commercialisation. The reasons for this are varied, but include the diversity of device operating principles, the variety of onshore/nearshore/offshore deployment possibilities, the diversity of the wave climate at various potential wave energy sites, and the consequent lack of convergence in technology and consensus. This distributed effort has, in turn, lead to a slow rate of progression up the learning curve, with a significant number of wave energy company liquidations and technical setbacks dampening investor confidence. Although a number of reviews on wave energy technology are already in the published literature, such a dynamic environment merits an up‐to‐date analysis and this review examines the wave energy landscape from a technological, research and commercial perspective.

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“…Thus, the pressure can be computed by

\begin{matrix} true \\ right p = - ρ g z - ρ \frac{\partial ϕ}{\partial t} - \frac{ρ}{2} {false(\nabla ϕ false)}^{2} . \end{matrix}

H ≪ λ

) and the device motion is small, linear potential flow (LPF) theory can be applied to solve the Laplace and linear Bernoulli equations in Figure 6.…”

Section: Wave Energy Technology Principlesmentioning

confidence: 99%

A review of wave energy technology from a research and commercial perspective

Guo

Ringwood

2021

IET Renewable Power Gen

113

View full text Add to dashboard Cite

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“…The chamber and the duct together form a U-shaped duct. This has a natural period of oscillation which can be matched to that of the incoming waves to optimise energy production [19][20][21][22]. Experimental tests on a model placed in the natural laboratory of Reggio Calabria (Italy) achieved a maximum 66% wave power absorption under resonant conditions.…”

Section: Oscillating Water Column Wecsmentioning

confidence: 99%

Niche Applications and Flexible Devices for Wave Energy Conversion: A Review

et al. 2021

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We review wave energy conversion technologies for niche applications, i.e., kilowatt-scale systems that allow for more agile design, faster deployment and easier operation than utility scale systems. The wave energy converters for niche markets analysed in this paper are classified into breakwater-integrated, hybrid, devices for special applications. We show that niche markets are emerging as a very vibrant landscape, with several such technologies having now achieved operational stage, and others undergoing full-scale sea trials. This review also includes flexible devices, which started as niche applications in the 1980s and are now close to commercial maturity. We discuss the strong potential of flexible devices in reducing costs and improving survivability and reliability of wave energy systems. Finally, we show that the use of WECs in niche applications is supporting the development of utility-scale projects by accumulating field experience, demonstrating success stories of grid integration and building confidence for stakeholders.

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“…[10], where it was shown that the U-OWC configuration exhibited enhanced hydrodynamic performance compared to the traditional OWC, or to the L-shaped OWC. Moreover, the performance of the U-OWC is strongly dependent on its geometrical characteristics [11,12], such as the length and the width of the U-duct, the position of its opening below the mean water level, and the width and height of the inner chamber. Further, the optimal selection and control of the Power Take-Off (PTO) system is critical for maximizing the amount of converted energy [13].…”

Section: Introductionmentioning

confidence: 99%

Stochastic response determination of U-OWC energy harvesters: a statistical linearization solution treatment accounting for intermittent wave excitation

et al. 2022

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A novel statistical linearization technique is developed for determining approximately the response statistics and the power output of U-Oscillating Water Column (U-OWC) energy harvesting systems. In this regard, first, the governing equations are derived by employing the unsteady Bernoulli equation. Note that the intermittent, i.e., non-stationary, nature of the wave excitation, occurring in severe sea states due to uncovering of the U-OWC inlet, is explicitly accounted for in the herein proposed model. This is done by multiplying the excitation process with a Heaviside function dependent on the instantaneous free surface displacement. Next, the resulting coupled system of nonlinear integro-differential stochastic equations is solved approximately by relying on a statistical linearization technique. Specifically, the original system of nonlinear equations is replaced by an equivalent linear one, whose parameters and response first- and second-order statistics are obtained by minimizing the mean square error between the two systems. A significant novel aspect of the technique relates to the fact that the Heaviside function is replaced in the equivalent linear system by an “equivalent excitation” coefficient to be determined as part of the statistical linearization solution scheme. Further, compared with other relevant solution schemes adopted in earlier research efforts in the literature, it is shown that the developed technique can be construed as a direct generalization that exhibits an enhanced accuracy degree. The U-OWC installed in the Civitavecchia harbor (Rome, Italy) is considered as an illustrative numerical example, where the reliability of the approximate technique is demonstrated by comparisons with pertinent Monte Carlo simulation data.

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Geometrical investigation of a U-shaped oscillating water column wave energy device

Cited by 33 publications

References 36 publications

A review of wave energy technology from a research and commercial perspective

A review of wave energy technology from a research and commercial perspective

Niche Applications and Flexible Devices for Wave Energy Conversion: A Review

Stochastic response determination of U-OWC energy harvesters: a statistical linearization solution treatment accounting for intermittent wave excitation

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