Results 151 to 160 of about 1,802 (177)
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Quantification of flow noise produced by an oscillating hydrofoil
Ocean Engineering, 2019Abstract After getting inspired from swimming natural species, a lot of research is being carried out in the field of unmanned underwater vehicles. During the last two decades, more emphasis on the associated hydrodynamic mechanisms, structural dynamics, control techniques and, its motion and path planning has been prominently witnessed in the ...
Muhammad Saif Ullah Khalid +2 more
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Unsteady forces on oscillating hydrofoils
1966An experimental apparatus is described which has proved to be well suited to the determination of the unsteady lift forces on a hydrofoil oscillating in heave under a free surface. Results are presented for tests covering a wide range of reduced frequency with several foil models in fully wetted, base-ventilated, and supercavitating flow.
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Fish-Inspired Hydrodynamic Study of Stationary, Undulating, and Oscillating Hydrofoils
2022A fish-inspired research, on flow across a hydrofoil that is stationary or mimicking various types of fish-inspired swimming, can reveal efficient flow mechanisms that can lead to a novel design and development of autonomous underwater vehicles (AUVs) or energy extraction devices. The present thesis starts with various flow transitions in the wake of a
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Prototype testing of a hydrokinetic turbine based on oscillating hydrofoils
Renewable Energy, 2011Abstract 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 +7 more
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Oscillating Hydrofoil Propulsion for Human-Powered Watercraft Applications
2013Unlike conventional propellers, flapping wings may generate large amplitude oscillating forces, which can make them difficult to incorporate into a craft design. This is particularly true for a single, vertically oscillating hydrofoil, as part of a surface water craft where the cyclic lift of the hydrofoil disrupts the craft stability.
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Effect of Hydrofoil Shapes on Partial and Transitional Cavity Oscillations
Journal of Fluids Engineering, 2007The 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 +3 more
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Energy extraction and hydrodynamic behavior analysis by an oscillating hydrofoil device
Renewable Energy, 2017Abstract In this paper, a modified model is proposed for an oscillating foil energy harvesting device, and the corresponding mathematical model is established too. A grid model for foil NACA0015 is built by using dynamic and moving mesh technology of the Computational Fluid Dynamics (CFD) software FLUENT.
Penglei Ma +4 more
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Unsteady Gaseous Diffusion Associated with a Fully Cavitating Oscillating Flat-Plate Hydrofoil
SNAME 22nd American Towing Tank Conference, 1989Although the emphasis of this paper is on gaseous diffusion into a full cavity behind an oscillating flat-plate hydrofoil, the unsteady diffusion theory given below applies also to the limiting case of "steady" supercavitating flow. The entire unbounded flow is assumed to be turbulent and a turbulent diffusivity is employed which enables one to make ...
K. Ravindra, B. R. Parkin
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Numerical research on hydrodynamic characteristics of fish-like flexible oscillating hydrofoil
2018 IEEE 8th International Conference on Underwater System Technology: Theory and Applications (USYS), 2018Hydrofoil is a common structure of underwater machinery and has good hydrodynamic performance. At present, most of the studies on oscillating hydrofoils are on rigid hydrofoils, but few on hydrodynamics of flexible oscillating hydrofoils. In this paper, the kinetic model of flexible hydrofoil is established by imitating tuna swimming.
Zhitong Li +4 more
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Experimental and Numerical Study for Hydrodynamic Characteristics of an Oscillating Hydrofoil
Journal of Hydrodynamics, 2008The present article reports the experimental Particle Image Velocimetry (PIV) investigation and the corresponding numerical simulation results about the water flow over the oscillating hydrofoil and its unsteady dynamic characters. The experimental study focuses on the effect of mean angles of attack.
Zhen Liu +3 more
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