Numerical Simulations for Aerodynamic Performance of a Butterfly-Like Flapping Wing-Body Model with Various Wing Planforms

Suzuki, Kosuke; Yoshino, Masato

doi:10.4208/cicp.oa-2016-0238

Cited by 8 publications

(19 citation statements)

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“…As for simplification (1), the effect of the wing planform on the aerodynamic performance has been investigated in our previous study (Suzuki & Yoshino 2018). In this study, it was found that an actual butterfly’s wings can generate larger aerodynamic forces than the square wings, e.g.…”

Section: Discussion: the Limitations Of The Modelmentioning

confidence: 99%

“…We calculate the free flight without rotation for an actual butterfly’s wings used in our previous study (Suzuki & Yoshino 2018). For this wing planform with uniform mass density, the integral forms of mass distribution given by (2.3)–(2.7) are measured as , , , and , where is the characteristic length equal to the square root of the wing area.…”

Section: Discussion: the Limitations Of The Modelmentioning

confidence: 99%

“…The non-dimensional expected supportable total mass for mm for various values of the Reynolds number is shown in table 4. The definition of is the same as that in our previous study (Suzuki & Yoshino 2018). By using these parameters, we calculate the values of the Reynolds number and the wing-mass ratio resulting in the upward flight and the downward flight when the characteristic length mm as shown in figure 17.…”

Section: Discussion: the Limitations Of The Modelmentioning

confidence: 99%

“…The validation of the numerical method and the convergence studies for temporal and spatial resolutions have been extensively checked in Suzuki et al. (2015) and Suzuki & Yoshino (2018). In addition, Engels et al.…”

Section: Numerical Methods and Computational Parametersmentioning

confidence: 99%

“…Actually, the individual effects of the wing kinematics and of the wing planform on the aerodynamic performance were investigated effectively by using this model (Suzuki et al. 2015; Suzuki & Yoshino 2017, 2018). Comprehensive parametric studies using this model will give valuable data for the design of insect-inspired MAVs.…”

Section: Butterfly-like Modelmentioning

confidence: 99%

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Effect of wing mass on the free flight of a butterfly-like model using immersed boundary–lattice Boltzmann simulations

2019

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The wings of butterflies are relatively heavier than those of other insects, and the inertial force and torque due to the wing mass are likely to have a significant effect on agility and manoeuvrability in the flapping flight of butterflies. In the present study, the effect of wing mass on the free flight of butterflies is investigated by numerical simulations based on an immersed boundary–lattice Boltzmann method. We use a butterfly-like model consisting of two square wings with mass connected by a rod-shaped body. We simulate the free flights of the model by changing the ratio of the wing mass to the total mass of the model and also changing the mass distributions of the wings. As a result, we find that the aerodynamic vertical and horizontal forces decrease as the wing-mass ratio increases, since for a large wing-mass ratio the body has large vertical and horizontal oscillations in each stroke and consequently the speeds of the wing tip and the leading edge relatively decrease. In addition, we find that the wing-mass ratio has a dominant effect on the rotational motion of the model, and a large wing-mass ratio reduces aerodynamic force and intensifies the time variation of the pitching angle. From the results of our free flight simulations, we clarify the critical wing-mass ratio between upward flight and downward flight and find that the critical wing-mass ratio is a function of the non-dimensional total mass and almost independent of the wing length. Then, we evaluate the effect of the wing-mass distribution on the critical wing-mass ratio. Finally, we discuss the limitations of the model.

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Section: Discussion: the Limitations Of The Modelmentioning

confidence: 99%