Numerical Evaluation of Optimal Sizes of Wells Turbine and Chamber of a Cluster of Oscillating Water Columns Integrated into a Breakwater on the Southern Brazilian Coast
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 148, Issue 4
Abstract
This paper describes a numerical evaluation of optimal sizes of a Wells turbine and chamber cross section to be used in a cluster of an oscillating water column (OWC) wave energy converter device. The FLUENT numerical model, based on the Reynolds–averaged Navier–Stokes equations and the volume of fluid technique, is used for modeling hydrodynamic and aerodynamic flows. Two new methods are developed for diminishing the computational cost: the generalized–TDO (turbine diameter optimization) model and the HAS (hydro-aerodynamic similarity) model. The generalized–TDO model is developed to determine the optimal turbine diameter for an OWC chamber with a square cross section. The analytical HAS model employs a similitude method to extend results obtained for a square cross section of the OWC chamber to a rectangular one. The optimal length, B, and width, W, of the chambers and turbine diameter, D, chosen by taking into account the southern Brazilian wave climate, were B × W = 15 × 15 m2 and D = 2.75 to 3.00 m and 20 × 20 m2 and D = 3.25 to 3.50 m, with efficiencies of 51% and 49%, respectively. Same optimal annual efficiency can be obtained for rectangular cross-section chambers 15 × W and 20 × W by using an adequate turbine diameter defined by the HAS model.
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Data Availability Statement
The data that support the findings of this study are available from the corresponding author upon reasonable request.
The authors acknowledge the cooperation between the Universidade Federal do Rio Grande – FURG, Brazil, and the Laboratório Nacional de Engenharia Civil – LNEC, Portugal. The first author acknowledges the support of CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) for the post-graduate scholarship.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 148 • Issue 4 • July 2022
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© 2022 American Society of Civil Engineers.
History
Received: Nov 18, 2021
Accepted: Mar 11, 2022
Published online: May 3, 2022
Published in print: Jul 1, 2022
Discussion open until: Oct 3, 2022
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