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Research on Hydrodynamic Characteristics and Propulsive Mechanism of Oscillating Tuna-tail

Author: YangLiang
Tutor: SuYuMin
School: Harbin Engineering University
Course: Engineering Mechanics
Keywords: Computational Fluid Dynamics Hydrodynamic performance Propulsion mechanism Crescent-shaped tail fin Imitation tuna swimming Trailing vortex
CLC: U661.1
Type: PhD thesis
Year: 2009
Downloads: 217
Quote: 2
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Abstract


Tuna, dolphins, sharks and other aquatic life swimming with efficient, high-speed, low-noise characteristics, when they are swimming propulsion underwater vehicle research, underwater vehicle movement stealth performance has a very important significance. Therefore, in order to explore the structural characteristics of the trailing vortex generated when the swing of the tail fin for the purpose of using computational fluid dynamics method, imitation tuna the swinging tail fin hydrodynamic performance and propulsion mechanism. Paper, first calculate the two-dimensional, three-dimensional hydrofoil given hydrodynamic performance of the grid structure calculation parameters calculate the impact of the results of the hydrodynamic performance of the hydrofoil and corresponding flow structure display. Then a two-dimensional rigid, flexible oscillating hydrofoil hydrodynamic performance numerical computation and propulsion mechanism, which found a relationship between the fluctuating hydrodynamic loads generated by the tail oscillating hydrofoil evolution of the vortices and the oscillating hydrofoil. Second, the numerical calculation of hydrodynamic performance of crescent-shaped caudal fin tuna, the swing of the tail fin trailing vortex structure and propulsion mechanism and analysis of robotic fish caudal fin propulsion system hydrodynamic performance of the experimental apparatus. The text of the caudal fin motion processing Misalignment and the coupled motion while swinging at a uniform forward. Computational domain is divided into of regional flow core and non-core area meshing methods are used in the calculation to determine the mesh size of the core region of the caudal fin wake field is the chord length of the caudal fin characteristics 1/20-1/30; use on the processing of the moving boundary the spring deformation based dynamic mesh, flexible tail fin hydrodynamic performance parallel computing, taken two ways to eliminate the error motion partition the surface grid points. At the same time based on the Reynolds time-averaged Navier - Stokes equations of viscous flow solution method to find a correspondence between a movement cycle of rigid and flexible tail fin the fluctuating hydrodynamic and trailing vortex shedding, forward speed and shifting swing amplitude, frequency, and flexible deformation magnitude of the propulsion performance, and compared with the change of the beat frequency, rigid and flexible tail fin hydrodynamic performance of different at the same input power factor. Finally, Harbin Engineering University biomimetic underwater vehicle \At the same time, the calculation of imitation tuna uniform rectilinear swimming underwater vehicle hydrodynamic performance, compare the the swinging tail fin body affect body under the influence of input, output, power coefficient and propulsive efficiency. Numerical Simulation of the fish surface pressure distribution, the flow field around the structure and the corresponding changes in the wake; trailing vortex generated by the swing of the distortions of the trunk and caudal interaction on hydrodynamic performance. This thesis shows that, using computational fluid dynamics method of imitation tuna swimming propulsion mechanism of hydrodynamic performance analysis is feasible. Propulsion and maneuvering fish have their own unique way, the need for further and more in-depth study.

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