Theoretical modeling of a bottom-raised oscillating surge wave energy converter structural loadings and power performances

Nguyen, Nhu; Davis, Jacob; Tom, Nathan; Thiagarajan, Krish

doi:10.1016/j.apor.2024.104031

Theoretical modeling of a bottom-raised oscillating surge wave energy converter structural loadings and power performances

Journal Article · Tue May 28 00:00:00 EDT 2024 · Applied Ocean Research

DOI:https://doi.org/10.1016/j.apor.2024.104031· OSTI ID:2371518

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Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Univ. of Washington, Seattle, WA (United States)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Univ. of Massachusetts, Amherst, MA (United States)

Here, this study presents theoretical formulations to evaluate the fundamental parameters and performance characteristics of a bottom-raised oscillating surge wave energy converter (OSWEC) device. Employing a flat plate assumption and potential flow formulation in elliptical coordinates, closed-form equations for the added mass, radiation damping, and excitation forces/torques in the relevant pitch-pitch and surge-pitch directions of motion are developed and used to calculate the system's response amplitude operator and the forces and moments acting on the foundation. The model is benchmarked against numerical simulations using WAMIT and WEC-Sim, showcasing excellent agreement. The sensitivity of plate thickness on the analytical hydrodynamic solutions is investigated over several thickness-to-width ratios ranging from 1:80 to 1:10. The results show that as the thickness of the benchmark OSWEC increases, the deviation of the analytical hydrodynamic coefficients from the numerical solutions grows from 3% to 25%. Differences in the excitation forces and torques, however, are contained within 12%. While the flat plate assumption is a limitation of the proposed analytical model, the error is within a reasonable margin for use in the design space exploration phase before a higher-fidelity (and thus more computationally expensive) model is employed. A parametric study demonstrates the ability of the analytical model to quickly sweep over a domain of OSWEC dimensions, illustrating the analytical model's utility in the early phases of design.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Water Power Technologies Office; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC36-08GO28308; NA0003525

OSTI ID:: 2371518

Report Number(s):: NREL/JA--5700-87345; MainId:88120; UUID:ac023d00-fff6-4bc4-8a05-4b1f49088bc5; MainAdminId:72517

Journal Information:: Applied Ocean Research, Journal Name: Applied Ocean Research Vol. 149; ISSN 0141-1187

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Theoretical modeling of a bottom-raised oscillating surge wave energy converter structural loadings and power performances

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