Comparison of cicada hindwings with hindwing-less drosophila for flapping motion at low Reynolds number

Lee, Hyeon Kyun; Jang, Jin Woo; Wang, Jin Yeong; Son, Young Kap; Lee, Sang-Hwan

doi:10.1016/j.jfluidstructs.2019.02.015

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…On the other hand, Harbig et al reported in their numerical calculations of a revolving wing with a fruit fly model that the narrower width per unit span of a high-AR wing causes the LEV to interact with the trailing-edge vortex (TEV) from the lower side of the wing, reducing the circulation and, thus, the lift [42]. Comparing cicada hindwings with hindwing-less Drosophila, in which the cicada wings have two distinct trailing-edge shapes with a reduced wing tip area and an increased wing root area, clear differences in trailing-edge vortex formulation and stabilization of the flow in the wing span direction have been reported to improve lift [43].…”

Section: Aerodynamic Performance Of a Hawkmoth With/without Hindwingsmentioning

confidence: 99%

Effect of Hindwings on the Aerodynamics and Passive Dynamic Stability of a Hovering Hawkmoth

Noda,

Nakata,

Liu

2023

Biomimetics

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Insects are able to fly stably in the complex environment of the various gusts that occur in nature. In addition, many insects suffer wing damage in their lives, but many species of insects are capable of flying without their hindwings. Here, we evaluated the effect of hindwings on aerodynamics using a Navier–Stokes-based numerical model, and then the passive dynamic stability was evaluated by coupling the equation of motion in three degrees of freedom with the aerodynamic forces estimated by the CFD solver under large and small perturbation conditions. In terms of aerodynamic effects, the presence of the hindwings slightly reduces the efficiency for lift generation but enhances the partial LEV circulation and increases the downwash around the wing root. In terms of thrust, increasing the wing area around the hindwing region increases the thrust, and the relationship is almost proportional at the cycle-averaged value. The passive dynamic stability was not clearly affected by the presence of the hindwings, but the stability was slightly improved depending on the perturbation direction. These results may be useful for the integrated design of wing geometry and flight control systems in the development of flapping-winged micro air vehicles.

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Section: Aerodynamic Performance Of a Hawkmoth With/without Hindwingsmentioning

confidence: 99%

Effect of Hindwings on the Aerodynamics and Passive Dynamic Stability of a Hovering Hawkmoth

Noda,

Nakata,

Liu

2023

Biomimetics

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The Importance of Morphology in Further Unraveling the Bumblebee Flight Paradox

Shah¹,

Battaglia²,

Bayandor

2022

Journal of Fluids Engineering

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The size of a bumblebee relative to its wing-span would suggest that flight is not possible according to the conventional aerodynamic theories, yet nature shows that not to be true. Bumblebee wings have venations that create corrugations, with their forewing and hindwing connected with a hook-like structure, known as hamulus. Previous investigations of bumblebee flight modeled wings as smooth surfaces or neglected their accurate morphological representation of corrugation or used a simplified body. To address these shortcomings, the current work explores the significance of vein corrugation and body on lift and thrust, and morphological importance of hindwing and forewing in flapping flight. Computational fluid dynamics simulations were used to analyze an anatomically accurate bee wing and body for hovering and forward speeds. Flow analysis of corrugated and smooth wing models revealed that corrugation significantly enhanced lift by 14%. With increasing speed, the hindwing increased lift from 14% to 38% due to the combined camber created by the forewing and hindwing. A notable feature was that the LEV did not change in size when the hindwing was removed, therefore forewing pressure remained the same as when coupled with hindwing during downstroke. When the bee body was included, the pressure decreased locally between the wing root to 25% of the wingspan on the dorsal side, causing lift for the corrugated model to increase by 11%. The study demonstrates importance of accurately modeling wing corrugation and bee body in flapping flight aerodynamics to unravel the true load-lifting capacity of bumblebees.

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Comparative study between a discrete vortex method and an immersed boundary–lattice Boltzmann method in 2D flapping flight analysis

Suzuki

Kato

Tsue

et al. 2020

Int. J. Mod. Phys. C

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Numerical analysis of the flapping flight of insects has attracted great attention because of the expectation for insect-inspired micro air vehicles. A lot of numerical methods for the insect flight have been proposed, and they can be classified into two categories: inviscid flow solvers and viscous flow solvers. The discrete vortex method (DVM) has been regarded as a successful method in the first category, and the immersed boundary–lattice Boltzmann method (IB-LBM) has recently been developed as an efficient method in the second category. However, a detailed comparative study between these methods has not been sufficiently performed. In this study, we compare the DVM with the IB-LBM in two-dimensional flapping flight analysis. As a result, it is found that the aerodynamic forces obtained by the DVM are comparable to those by the IB-LBM, when the effect of separated vortices is not so accumulated, and when the forward speed of the model is smaller than the flapping speed. In addition, the DVM has a difficulty in estimating the aerodynamic torque. In terms of the computational time, the DVM is much faster than the IB-LBM. This result suggests that the DVM can be used for massive parametric studies or optimizations in flapping flight analysis, although there remain many issues in its accuracy.

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Comparison of cicada hindwings with hindwing-less drosophila for flapping motion at low Reynolds number

Cited by 4 publications

References 34 publications

Effect of Hindwings on the Aerodynamics and Passive Dynamic Stability of a Hovering Hawkmoth

Effect of Hindwings on the Aerodynamics and Passive Dynamic Stability of a Hovering Hawkmoth

The Importance of Morphology in Further Unraveling the Bumblebee Flight Paradox

Comparative study between a discrete vortex method and an immersed boundary–lattice Boltzmann method in 2D flapping flight analysis

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