Numerical simulations of a butterfly-like flapping wing-body model: effects of wing planform, mass, and flexibility


Shinshu University
https://scholar.google.com/citations?user=w8qRWu4AAAAJ&hl=en

Date(s) : 01/07/2020   iCal
10 h 00 min - 11 h 00 min

Butterflies have unique and interesting features compared with other insects. The most conspicuous example is their erratic trajectory and large variation in flight speed. This behavior suggests that butterflies have outstanding agility and maneuverability, which are attractive features in practical applications such as micro air vehicles (MAVs). It has been know that butterfly’s flight is far from hovering or steady forward flights and is longitudinally unstable. Therefore, in order to elaborately simulate the free-flying butterfly, we have to consider the interaction between the fluid motion, wing motion, body motion (translational and rotational), and attitude control. Instead of performing such an elaborate simulation, our research group has attempted to clarify the minimum configuration for reproducing the free-flying butterfly by using a simplified butterfly model, namely butterfly-like flapping wing-body model. This model is composed of two thin rigid wings and a rod-shaped body, and flaps its wings downward to generate lift force and backward to generate thrust force like an actual butterfly. It has been found that such a simple model can generate enough lift force to support an actual butterfly’s weight even in its free flight from the resting state. In addition, we have investigated the impact of the individual factors, such as wing planform, mass and flexibility. In my presentation, I will show the recent results using the butterfly-like flapping wing-body model.

Prof. Dr. Kosuke Suzuki, Department of Mechanical Systems Engineering, Shinshu University

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