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Aerodynamics of a wing under figure-of-eight flapping motion: FSI simulations

Published online by Cambridge University Press:  07 May 2021

Y.-J. Chu Open the ORCID record for Y.-J. Chu [Opens in a new window] ,
H.-L. Liew Open the ORCID record for H.-L. Liew [Opens in a new window]  and
P. Balan Ganesan Open the ORCID record for P. Balan Ganesan [Opens in a new window]
Y.-J. Chu
Affiliation:
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia
H.-L. Liew
Affiliation:
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia
P. Balan Ganesan*
Affiliation:
Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia Centre for Research in Biotechnology for Agriculture (CEBAR), Level 3, Research Management & Innovation Complex, University of Malaya, 50603, Kuala Lumpur, Malaysia
*
[email protected]
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Abstract

This paper investigates the aerodynamics of a wing under figure-of-eight flapping motion based on Fluid–Structure Interaction (FSI) Computational Fluid Dynamics (CFD) simulations. The kinematic of a wing under figure-of-eight motion creates a condition with a variable angle-of-attack. The effect of using different angles of attack at an initial condition, namely initial pitch angles, for the wing and the spatial size of the figure-of-eight pattern, namely the input link angle, is investigated. The initial pitch angles input is varied from 0° to 330° in steps of 30°, and the input link angles used are 30°, 45°, and 60°. The Young’s modulus of the wing is 3.4 GPa spanwise, which is the elastic modulus of balsa wood material. In comparison with an initial pitch angle of 0°, the 90° initial pitch angle shows much better flight performance in terms of lift generated and stability. The results show that the maximum average lift coefficient of 0.393 occurs at the 90° initial pitch angle. The maximum lift-induced moment for the 90° initial pitch angle is only 5.55% of the maximum lift induced moment for the 0° initial pitch angle. A higher input link angle generates a greater lift force. The pressure distribution in the vicinity of the wing area and the von Mises stress of the wing are also presented.

Keywords

Figure-of-eight motionFlapping wingAngle-of-attackPitch angleElastic wingYoung’s modulusInput link angleFSI
Type
Research Article
Information
The Aeronautical Journal , Volume 125 , Issue 1293 , November 2021 , pp. 1917 - 1941
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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