Results 151 to 160 of about 343 (174)

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.
Kartikeya Mahalatkar, Jeff Litzler, Karman Ghia, Urmila Ghia   +3 more
openaire   +1 more source

Effects of spanwise flexibility on the hydrodynamic performance of an oscillating hydrofoil

Ocean Engineering
Zhanbin Meng
exaly   +2 more sources

Prototype testing of a hydrokinetic turbine based on oscillating hydrofoils

Renewable Energy, 2011
Abstract A new concept of hydrokinetic turbine using oscillating hydrofoils to extract energy from water currents (tidal or gravitational) is presented and tested in this investigation. This technology is particularly well suited for riverbeds and shallow waters near the coasts due to its rectangular extraction plane.
T. Kinsey, G. Dumas, G. Lalande, J. Ruel, A. Méhut, P. Viarouge, J. Lemay, Y. Jean   +7 more
openaire   +1 more source

Behaviors of two semi-passive oscillating hydrofoils with a tandem configuration

Energy, 2021
Abstract Two hydrofoils with a tandem spatial configuration can share the same flow window. The wake vortex interaction and blockage effect have noticeable impacts on the response of two hydrofoils for a semi-passive system. In this study, the responses of two oscillating hydrofoils with a tandem arrangement are examined using a numerical approach ...
Penglei Ma, Yong Wang, Yudong Xie, Guijie Liu   +3 more
openaire   +1 more source

Optimum propulsion of an oscillating hydrofoil

IEEE Transactions on Automatic Control, 1966
A study is made on the optimization aspect of marine propulsion in the light of optimum control theory for distributed parameter systems. In particular, the problem of determining the motion of a thin hydrofoil or a "thin fish" to maximize the average thrust in the presence of instantaneous or average power limitation constraint is considered ...
openaire   +1 more source

The influence of a narrow channel on the performance of an oscillating hydrofoil power generator

Renewable Energy
Guanghua He, Hassan Ghassemi
exaly   +2 more sources

Hydrodynamic characteristics of wing-in-ground effect oscillating hydrofoil on power extraction performance [PDF]

Energy Reports
The energy contained in the tidal motion of the seas and oceans has the potential to be a significant source ofrenewable energy. The oscillating hydrofoil current-energy turbine has a good performance to extract energyfrom the coupling of its heaving and
Weijie Mo, Guanghua He, Hassan Ghassemi   +2 more
exaly   +1 more source

Effect of Hydrofoil Shapes on Partial and Transitional Cavity Oscillations

Journal of Fluids Engineering, 2007
The effects of foil geometry on partial and transitional cavity oscillations were examined by experiments. The transitional cavity oscillation can be observed in the upstream pressure fluctuation for all foils and the amplitude of oscillation becomes larger when the maximum cavity length becomes larger than about 75% of the chord length.
Akira Fujii, Damien T. Kawakami, Yoshinobu Tsujimoto, Roger EA Arndt   +3 more
openaire   +1 more source

Generating controllable velocity fluctuations using twin oscillating hydrofoils

Journal of Fluid Mechanics, 2012
AbstractAn 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.
openaire   +1 more source

A Reduced-Order Model for an Oscillating Hydrofoil Near the Free Surface

SNAME 13th International Conference on Fast Sea Transportation, 2015
The first objective of this work is to numerically investigate how the proximity to the free surface influences the hydrodynamic response and susceptibility to cavitation of a hydrofoil undergoing controlled pitching oscillations, for high-speed full-scale operating conditions. A second objective is to develop a time-domain Reduced Order Model (ROM) to
Rory C. Kennedy, Dillon Helfers, Yin Lu Young   +2 more
openaire   +1 more source