Wave-induced real-fluid effects in marine energy converters: Review and application to OWC devices. (September 2019)

• Record Type: Journal Article
• Authors: Zabala, I.; Henriques, J.C.C.; Blanco, J.M.; Gomez, A.; Gato, L.M.C.; Bidaguren, I.; Falcão, A.F.O.; Amezaga, A.; Gomes, R.P.F.
• Is Part Of: Renewable & sustainable energy reviews. Volume 111(2019)
• Page Start: 535
• Page End: 549
• Publication Date: 2019-09
• Subjects: Marine renewable energy -- Viscous drag -- Morison's equation -- Numerical wave tank -- Computational fluid dynamics -- Oscillatory boundary layer flows; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.rser.2019.05.025
• Languages: English
• ISSNs: 1364-0321

Abstract

Abstract: The performance assessment of industrial marine energy converters involves the integrated treatment of their hydrodynamic design and the optimization of their device hulls. Nowadays, such tasks require extensive experimental work and simulation plans, consuming considerable resources and time. In this comprehensive review of integrated approaches to numerical and experimental testing, the advantages and disadvantages of existing tools, from full-scale prototype and wave tank models to Computational Fluid Dynamics (CFD) and potential flow simulations, are all analysed. Likewise, current challenges such as experimental scale effects, numerical viscosity, and turbulence treatment are all studied. The novelty of this research is an integrated approach that employs experimental wave tank tests to validate a numerical wave tank model based on CFD that serves to calibrate a fast potential flow solver with Morison's correction terms. The model allows running, on tight resources, the necessary simulation for the design and optimisation of marine energy converters under multiple sea state conditions. Given the operating regimes of conventional marine energy converters, the results show that the influence of turbulence may be small, due to the unsteady nature of the oscillatory boundary layer flows. Highlights: Morison equation is used to correct potential flow results. Morison equation terms are calibrated with numerical wave tank modelling. Numerical wave tank model is calibrated with experimental data from decay tests. The methodology aims to reduce the dependence on scale and tank effects. Turbulence effects may be small in wave-induced flows.