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Tidal energy extraction: renewable, sustainable and predictable. [PDF]
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Cavitating Multiphase Flow over Oscillating Hydrofoils
44th AIAA Aerospace Sciences Meeting and Exhibit, 2006*† ‡ Many maritime applications involve the use of dynamically moving hydrofoils. Numerical simulations using Reynolds averaged Navier-Stokes equations are carried out to analyze the effect of cavitation on the dynamic stall of an oscillating hydrofoil. It was found that the flow physics changes considerably with cavitation.
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Unsteady attached cavitation on an oscillating hydrofoil
Journal of Fluid Mechanics, 1988A series of visualizations of non-cavitating and cavitating unsteady flows around an oscillating hydrofoil has been carried out in order to investigate the effect of unsteadiness on attached cavitation. The major conclusion of the present experimental analysis is that the strong interaction that was previously pointed out in the case of steady ...
Franc, Jean-Pierre, Michel, Jean-Marie
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Fluid–structure coupling for an oscillating hydrofoil
Journal of Fluids and Structures, 2010Abstract Fluid-structure investigations in hydraulic machines using coupled simulations are particularly time-consuming. In this study, an alternative method is presented that linearizes the hydrodynamic load of a rigid, oscillating hydrofoil. The hydrofoil, which is surrounded by incompressible, turbulent flow, is modeled with forced and free ...
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The Design of Oscillating Hydrofoil Current Generation Device
Applied Mechanics and Materials, 2015The oscillating hydrofoil current generation device utilizes a typical movement type, which can transform energy effectively from current. The study shows that the geometrical profile of blades is the fundamental factor to the efficiency. In order to resolve the problem, this paper adapt the BEM(blade elements momentum) theory, which plays an important
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Generating controllable velocity fluctuations using twin oscillating hydrofoils
Journal of Fluid Mechanics, 2012AbstractAn experiment apparatus has been previously developed with the ability to independently control the instantaneous flow velocity in a water flume. This configuration, which uses two pitching hydrofoils to generate the flow fluctuations, allows the unsteady response of submerged structures to be studied over a wide range of driving frequencies ...
Harding, S. F., Bryden, I. G.
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Energy extraction performance of motion-constrained tandem oscillating hydrofoils
Journal of Renewable and Sustainable Energy, 2017An energy extraction technology based on motion-constrained tandem oscillating hydrofoils is presented in this paper. The turbine for extracting energy from the flow field is designed and built based on the measured frequency and energy extraction performance analysis of motion-constrained tandem oscillating hydrofoils. The instantaneous rotating speed
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