Fluid Dynamics of Flapping Insect Wing in Ground Effect

doi:10.1016/S1672-6529(14)60019-6

J4 ›› 2014, Vol. 11 ›› Issue (1): 52-60.doi: 10.1016/S1672-6529(14)60019-6

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Fluid Dynamics of Flapping Insect Wing in Ground Effect

Jie Wu, Chang Shu, Ning Zhao, Weiwei Yan

1. Department of Aerodynamics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
2. Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260, Singapore
3. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, P. R. China

Received:2013-03-05 Revised:2013-12-05 Online:2014-01-10 Published:2014-01-10
Contact: Jie Wu E-mail:wuj@nuaa.edu.cn
About author:Jie Wu, Chang Shu, Ning Zhao, Weiwei Yan

Abstract

Abstract:

The fluid dynamics of flapping insect wing in ground effect is investigated numerically in this study. To model the insect wing cross-section in forward-flight mode, the laminar flow over a NACA0012 airfoil animated by a combination of harmonic plunge and pitch rotation is considered. To implement the simulation, the proposed immersed boundary-lattice Boltzmann method is employed. By fixing the Reynolds number and the amplitude of motion, we systematically examine the influences of the distance between the foil and the ground and the flapping frequency on the flow behaviors. As compared to the situation out of ground effect, the forces for foil placed in close proximity to the ground show some differences. The mean drag coefficient is increased at low frequency and decreased at high frequency. Meanwhile, the mean lift coefficient is increased at both low and high frequencies and decreased at middle frequency. Moreover, an interesting phenomenon with oblate vortices due to vortex interaction with the ground is observed.

Key words: flapping insect wing, ground effect, drag reduction, lift enhancement

Jie Wu, Chang Shu, Ning Zhao, Weiwei Yan. Fluid Dynamics of Flapping Insect Wing in Ground Effect[J].J4, 2014, 11(1): 52-60.

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