Load shedding characteristics of an oscillating surge wave energy converter with variable geometry

Choiniere, Michael; Tom, Nathan; Thiagarajan, Krish

doi:10.1016/j.oceaneng.2019.04.063

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…The testing of OSWEC-like concepts has also been completed at the University of Maine. This experimental validation campaign investigated the performance and load shedding capabilities of a variable geometry oscillating surge wave energy converter (VGOSWEC) that utilizes adjustable geometry to control device hydrodynamics [94]. The VGOSWEC test article was designed such that the main body of the OSWEC held five horizontal flaps spanning the interior of the frame.…”

Section: Experimental Validationmentioning

confidence: 99%

Review of WEC-Sim development and applications

Yu¹,

Ruehl²,

Tom³

et al. 2022

Int. J. Mar. Ene.

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WEC-Sim (Wave Energy Converter Simulator) is an open-source code for simulating wave energy converters, which has been actively developed and applied to simulate a wide variety of device archetypes, and has become a popular tool since its release. This paper reviewed the development efforts and the usage of WEC-Sim. The publications considered in this study have been broken down into six topic areas, namely feature development, experimental validation, device modeling, control modeling, PTO and grid modeling, and novel applications, which even includes some non-wave energy applications. This review paper has also attempted to recognize the contributions of the broader WEC-Sim development effort, meaning not only the internal WEC-Sim development team but also the external efforts from the academia researchers and technology developers around the world. The growing trend of external applications of WEC-Sim has demonstrated the broader acceptance of the open-source code, and how WEC-Sim has been used in a certain topic area also highlights the potential future development needs.

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Section: Experimental Validationmentioning

confidence: 99%

Review of WEC-Sim development and applications

Yu¹,

Ruehl²,

Tom³

et al. 2022

Int. J. Mar. Ene.

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show abstract

“…Ruehl et al [15] studied a dual-flap floating OSWEC in regular waves and compared the experimental data results with the numerical results obtained using the WEC-Sim program. Choiniere et al [16] studied the load shedding characteristics of OSWECs with variable geometries. In addition, the adjustable flap provides another control and adjustment capability for OSWECs, which has been studied by many researchers (see, for example, Tom et al [17,18]).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Sharp Eagle Oscillating Surge Wave Energy Converter Based on a Two-Dimensional Numerical Wave Flume Model

Sun,

Yang,

Chen

et al. 2023

JMSE

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To investigate the overtopping and slamming phenomena that occur in the interactions between waves and oscillating surge wave energy converters (OSWECs), a two-dimensional numerical wave flume was established using computational fluid dynamics (CFD) software Fluent by adding the momentum source terms into the original Navier–Stokes equation. Numerical convergence studies of the mesh sizes and time steps were firstly performed to ensure the sufficient accuracy of the numerical model. The variations in the wave heights along the wave propagation direction in the wave-generating area, working area, and wave-absorbing area were analyzed. The dynamics of the flap-type OSWEC were simulated using the overset mesh function embedded in Fluent. In addition, the numerical results were compared with the experimental data, and good agreements were achieved. External torque was applied to the hinge joint of the OSWEC to simulate the forces due to the power take-off (PTO) system, and the identified optimal PTO damping was compared with the numerical results based on the potential flow theory, which verified the correctness of the numerical PTO system. On this basis, nonlinear wave slamming by the sharp-eagle OSWEC was analyzed. The results show that under certain incident wave conditions, the sharp-eagle OSWEC can effectively reduce the maximum rotation angle and angular velocity compared with those of the flap-type OSWEC, and there is no overtopping that occurring for the sharp-eagle OSWEC. Furthermore, the sharp-eagle OSWEC performs better than the flap-type OSWEC.

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“…The hydrodynamic research of OWSCs has received attention in recent decades. Some experimental investigations on the motions and power capture of OWSCs in twodimensional (2D) wave tank [5][6][7] and three-dimensional (3D) wave basin [8,9] were conducted by researchers. With the development of cheap and powerful computer hardware, numerical simulation is becoming more popular and there is a rapidly growing number of modelling WECs.…”

Section: Introductionmentioning

confidence: 99%

Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter

Liu

Cho

Mizutani

et al. 2021

JMSE

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This paper studied the resonant behaviors of a bottom-hinged oscillating wave surge converter (OWSC) as well as the relationship of resonance with the response and capture width ratio (CWR). The time-domain dynamic equation of an OWSC in shallow water based on the boundary element method (BEM) was solved by a Python code, considering the corrected wave surface and the nonlinearities of restoring moment, drag, and friction. The unknown factors, such as wave surface corrected factor and drag coefficient, were effectively calibrated with computational fluid dynamics (CFD) method. An intermediate initial angle in free decay is appropriate for use to determine the natural period. Under regular waves, the resonance occurs near the natural period for the uniform wave amplitude, rather than the uniform wave torque amplitude, and can disappear due to the amplification of Power Take-Off (PTO) friction. Under unit-amplitude regular waves, the period of maximum CWR is relatively close to the period of maximum velocity, but far from the resonant period. Under irregular waves, no stable resonance is observed because the maximum equivalent pitch angle appears at different peak periods of wave spectra with the variation in PTO damping. When the period of a regular wave or the peak period of an irregular wave is close to the natural period, a phase hysteresis of velocity relative to wave torque always occurs.

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Load shedding characteristics of an oscillating surge wave energy converter with variable geometry

Cited by 10 publications

References 6 publications

Review of WEC-Sim development and applications

Review of WEC-Sim development and applications

Analysis of Sharp Eagle Oscillating Surge Wave Energy Converter Based on a Two-Dimensional Numerical Wave Flume Model

Study on the Resonant Behaviors of a Bottom-Hinged Oscillating Wave Surge Converter

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