Recent progress in flapping wing aerodynamics and aeroelasticity

Shyy, Wei; Aono, Hikaru; Chimakurthi, Satish Kumar; Trizila, Patrick Clark; Kang, Chang-Kwon; Cesnik, Carlos E. S.; H, Liu

doi:10.1016/j.paerosci.2010.01.001

Cited by 837 publications

(555 citation statements)

References 236 publications

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“…Finally, we see that the parameters used in this study, i.e. r* ¼ 7.8, h Ã s ¼ 0:02; and k around 0.6 result in a factor f1 þ p=ð4r Ã h Ã s Þg=k; introduced in the definition g given by equation (2.1), which is in a comparable range for the typical values for fruit flies with r* ¼ 1100 [23], h Ã s ¼ 0:6 Â 10 À3 [23], and k ¼ 0.212 [18]. This means that the effects of f/f 1 on g given by equation (2.1) in this study will be similar to that of a fruit fly.…”

Section: Numerical Modelsmentioning

confidence: 99%

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Scaling law and enhancement of lift generation of an insect-size hovering flexible wing

Kang

Shyy

2013

J. R. Soc. Interface.

164

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We report a comprehensive scaling law and novel lift generation mechanisms relevant to the aerodynamic functions of structural flexibility in insect flight. Using a Navier-Stokes equation solver, fully coupled to a structural dynamics solver, we consider the hovering motion of a wing of insect size, in which the dynamics of fluid-structure interaction leads to passive wing rotation. Lift generated on the flexible wing scales with the relative shape deformation parameter, whereas the optimal lift is obtained when the wing deformation synchronizes with the imposed translation, consistent with previously reported observations for fruit flies and honeybees. Systematic comparisons with rigid wings illustrate that the nonlinear response in wing motion results in a greater peak angle compared with a simple harmonic motion, yielding higher lift. Moreover, the compliant wing streamlines its shape via camber deformation to mitigate the nonlinear lift-degrading wing-wake interaction to further enhance lift. These bioinspired aeroelastic mechanisms can be used in the development of flapping wing micro-robots.

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Section: Numerical Modelsmentioning

confidence: 99%

“…It is established that shape adaptation associated with flexibility can affect the effective angle of attack and hence the aerodynamic outcome [18]. However, our understanding of fluid physics and the resulting structural dynamics has been insufficient to explain all the salient features of this coupled fluid-structure system.…”

Section: Introductionmentioning

confidence: 99%

Scaling law and enhancement of lift generation of an insect-size hovering flexible wing

Kang

Shyy

2013

J. R. Soc. Interface.

164

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“…The kinematics and mechanics of flapping flight for insects such as clap and fling, wake capture, and delayed stall have been thoroughly investigated and reported, as summarized by Shyy et al [3] and more recently by Chin and Lentink [4]. Of particular interest is the delayed stall phenomena, in which a leading edge vortex (LEV) on the upper edge of the wing enhances lift throughout the downstroke, which has been shown experimentally [5,6] and computationally [7,8].…”

Section: Introductionmentioning

confidence: 99%

Unsteady high-lift mechanisms from heaving flat plate simulations

Franck

Breuer

2017

International Journal of Heat and Fluid Flow

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Flapping animal flight is often modeled as a combined pitching and heaving motion in order to investigate the unsteady flow structures and resulting forces that could augment the animal's lift and propulsive capabilities. This work isolates the heaving motion of flapping flight in order to numerically investigate the flow physics at a Reynolds number of 40,000, a regime typical for large birds and bats and challenging to simulate due to the added complexity of laminar to turbulent transition in which boundary layer separation and reattachment are traditionally more difficult to predict. Periodic heaving of a thin flat plate at fixed angles of attacks of 1, 5, 9, 13, and 18 degrees are simulated using a large-eddy simulation (LES). The heaving motion significantly increases the average lift compared with the steady flow, and also surpasses the quasi-steady predictions due to the formation of a leading edge vortex (LEV) that persists well into the static stall region. The progression of the high-lift mechanisms throughout the heaving cycle is presented over the range of angles of attack. Lift enhancement compared with the equivalent steady state flow was found to be up to 17% greater, and up to 24% greater than that predicted by a quasi-steady analysis. For the range of kinematics explored it is found that maximum lift enhancement occurs at an angle of attack of 13 degrees, with a maximum lift coefficient of 2.1, a mean lift coefficient of 1.04.

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“…Flapping wing MAVs have received significant research attention in recent years due to their potential application in surveillance and environmental monitoring [2,3]. Extensive experimental and computational studies have been carried out to understand the unsteady aerodynamics of flapping wings [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Stochastic Bifurcation Analysis of an Elastically Mounted Flapping Airfoil

2018

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Abstract. The present paper investigates the effects of noisy flow fluctuations on the fluid-structure interaction (FSI) behaviour of a span-wise flexible wing modelled as a two degree-of-freedom elastically mounted flapping airfoil. In the sterile flow conditions, the system undergoes a Hopf bifurcation as the free-stream velocity exceeds a critical limit resulting in a stable limit-cycle oscillation (LCO) from a fixed point response. On the other hand, the qualitative dynamics changes from a stochastic fixed point to a random LCO through an intermittent state in the presence of irregular flow fluctuations. The probability density function depicts the most probable system state in the phase space. A phenomenological bifurcation (P-bifurcation) analysis based on the transition in the topology associated with the structure of the joint probability density function (pdf) of the response variables has been carried out. The joint pdf corresponding to the stochastic fixed point possesses a Dirac delta function like structure with a sharp single peak around zero. As the mean flow speed crosses the critical value, the joint pdf bifurcates to a crater-like structure indicating the occurrence of a P-bifurcation. The intermittent state is characterized by the co-existence of the unimodal as well as the crater like structure.

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Recent progress in flapping wing aerodynamics and aeroelasticity

Cited by 837 publications

References 236 publications

Scaling law and enhancement of lift generation of an insect-size hovering flexible wing

Scaling law and enhancement of lift generation of an insect-size hovering flexible wing

Unsteady high-lift mechanisms from heaving flat plate simulations

Stochastic Bifurcation Analysis of an Elastically Mounted Flapping Airfoil

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