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Numerical analysis on the propulsive performance of oscillating wing in ground effect
Highlights Re number effect and 3D influence on propulsive performance of oscillating wing in ground effect is firstly studied. An optimum range of St number and ground distance is reported for highest efficiency. The correlation between flow structure and propulsive performance of oscillating wing is well established.
Abstract The transient numerical simulation has been conducted by using of the Overlapping grid technique to investigate the ground wall effect on the propulsive performance of an oscillating wing. Both the two-dimensional and three-dimensional wing have been analyzed and the systematic analysis on the effect of the Reynolds number (Re), the average distance between the flapping foil and ground wall (h 0) on the propulsive performance of oscillating wing are investigated with respect to the non-dimensional oscillating frequency (St). The simulation results demonstrate that the existence of the ground wall can produce significant influence on the fluid dynamics of oscillating wing and the ground wall effect has close connection to the magnitude of St number. In addition, the increase of Re number will facilitate the growth of both thrust force and propulsive efficiency of oscillating wing and that influence also has close connection with the St number. Finally, the existence of ground wall can also greatly improve the propulsive performance of three-dimensional oscillating wing, but the sensitivity of three-dimensional oscillating wing to the ground wall is lower than that of two-dimensional oscillating wing. The conclusions acquired here can be utilized to optimize the kinematics of the underwater vehicles swimming near ground wall.
Numerical analysis on the propulsive performance of oscillating wing in ground effect
Highlights Re number effect and 3D influence on propulsive performance of oscillating wing in ground effect is firstly studied. An optimum range of St number and ground distance is reported for highest efficiency. The correlation between flow structure and propulsive performance of oscillating wing is well established.
Abstract The transient numerical simulation has been conducted by using of the Overlapping grid technique to investigate the ground wall effect on the propulsive performance of an oscillating wing. Both the two-dimensional and three-dimensional wing have been analyzed and the systematic analysis on the effect of the Reynolds number (Re), the average distance between the flapping foil and ground wall (h 0) on the propulsive performance of oscillating wing are investigated with respect to the non-dimensional oscillating frequency (St). The simulation results demonstrate that the existence of the ground wall can produce significant influence on the fluid dynamics of oscillating wing and the ground wall effect has close connection to the magnitude of St number. In addition, the increase of Re number will facilitate the growth of both thrust force and propulsive efficiency of oscillating wing and that influence also has close connection with the St number. Finally, the existence of ground wall can also greatly improve the propulsive performance of three-dimensional oscillating wing, but the sensitivity of three-dimensional oscillating wing to the ground wall is lower than that of two-dimensional oscillating wing. The conclusions acquired here can be utilized to optimize the kinematics of the underwater vehicles swimming near ground wall.
Numerical analysis on the propulsive performance of oscillating wing in ground effect
Li, Yongcheng (author) / Pan, Ziying (author) / Zhang, Nan (author)
Applied Ocean Research ; 114
2021-06-26
Article (Journal)
Electronic Resource
English
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