Unsteady Aerodynamic Effects of Wing-Body Interactions in Three-dimensional Insects' Flapping Flight

Lee, Kuen Bae; Kim, Jin Ho; Park, Jin Seok; Kim, Chongam

doi:10.2514/6.2012-419

Cited by 3 publications

(4 citation statements)

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“…The effects of the change in the insect body size relative to its wings do not appear to have been studied, although there are some numerical studies showing the effects of the presence of the insect body. Lee et al [ 19 ] and Liu et al [ 20 ] observed the differences between force production on model wings with and without an insect body, and concluded that the total lift production increased in the presence of the insect body. Wan et al [ 21 ] investigated cicada aerodynamics in forward flight and observed that the vortex generated from the cicada thorax enhanced the overall lift.…”

Section: Introductionmentioning

confidence: 99%

The leading-edge vortex on a rotating wing changes markedly beyond a certain central body size

et al. 2018

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Stable attachment of a leading-edge vortex (LEV) plays a key role in generating the high lift on rotating wings with a central body. The central body size can affect the LEV structure broadly in two ways. First, an overall change in the size changes the Reynolds number, which is known to have an influence on the LEV structure. Second, it may affect the Coriolis acceleration acting across the wing, depending on the wing-offset from the axis of rotation. To investigate this, the effects of Reynolds number and the wing-offset are independently studied for a rotating wing. The three-dimensional LEV structure is mapped using a scanning particle image velocimetry technique. The rapid acquisition of images and their correlation are carefully validated. The results presented in this paper show that the LEV structure changes mainly with the Reynolds number. The LEV-split is found to be only minimally affected by changing the central body radius in the range of small offsets, which interestingly includes the range for most insects. However, beyond this small offset range, the LEV-split is found to change dramatically.

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Section: Introductionmentioning

confidence: 99%

The leading-edge vortex on a rotating wing changes markedly beyond a certain central body size

et al. 2018

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“…Following the authors' previous research [13,17,22,23], similar analysis is carried out to examine the role of vortex structures, vortex interactions, and wing-body interactions in three-dimensional lift and thrust generation. Though the overall features are the same, as seen in Figs.…”

Section: A Overall Flow Featuresmentioning

confidence: 99%

“…5-(b) to 5-(d). Grid density is determined from the grid refinement study of the previous studies [13,17,22,23]. The main grid zone including the insect body has about 3.1 million (321×65×149) points, and the sub grid zone containing insect wing has about 2.48 million (449×97×57) points for type-1.…”

Section: Geometric Modeling and Boundary Conditionmentioning

confidence: 99%

“…In the authors' preliminary research efforts [12,13,17,22,23], two-and three-dimensional wing motions were simulated, and uncommon tendencies of vortex interactions and resulting flow patterns were observed, which provide a decisive clue for the impulsive thrust generation of insects' flapping motion. The present paper is in line with the same efforts, and detailed numerical simulations of a blowfly's 'wing-body' configuration with five types of wings under various body angles are conducted to examine unsteady flow features resulting from the wing-bodyvortex interactions.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional Unsteady Aerodynamic Characteristics of Wing-body-vortex Interactions in Insects' Flapping Flight

Lee

Kim

2013

31st AIAA Applied Aerodynamics Conference

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This paper investigates the unsteady aerodynamic features of wing-body-vortex interactions and the effects of geometric factors such as wing shape and body angle in insects' flapping motions under forward flight condition. A realistic wing trajectory, called the 'figure-of-eight' motion, is extracted from a blowfly (Phormia regina)'s tethered flight experiment under the freestream velocity of 2.75m/s. Since the flow field around the blowfly exhibits the characteristics of low-Reynolds number flow, three-dimensional unsteady incompressible Navier-Stokes equations are employed as the governing equations. In order to simulate the realistic insect flapping flight including geometric and kinematical complexity with a sufficient level of grid quality, the overset grid technique is used. From the authors' previous researches on two-and three-dimensional rigid wing simulation, it has been observed that the pattern of vortical flows and the interaction of vortices play an significant role in generating unsteady aerodynamic forces and determining the propulsive efficiency of flapping motion. Detailed numerical simulations of five types of wings are carried out under various body angles to examine unsteady flow characteristics resulting from the wing-body-vortex interactions, and the results are compared with those of the wing only case. Nomenclature c m = mean chord length U ∞ = freestream velocity U max = maximum wing velocity at aerodynamic mean chord ν = freestream kinematic viscosity Re = Reynolds number (=U max c m /ν)= flapping frequency in Hertz k = reduced frequency in terms of c m (= fc m /U max ) t = non-dimensional time T = non-dimensional flapping period χ = body angle α(t) = pitch angle motion ф(t) = position angle motion θ(t) = elevation angle motion

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Unsteady Aerodynamics and Wake Structures of Butterfly in Forward Flight

Lou

2023

AIAA AVIATION 2023 Forum

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Unsteady Aerodynamic Effects of Wing-Body Interactions in Three-dimensional Insects' Flapping Flight

Cited by 3 publications

References 10 publications

The leading-edge vortex on a rotating wing changes markedly beyond a certain central body size

The leading-edge vortex on a rotating wing changes markedly beyond a certain central body size

Three-dimensional Unsteady Aerodynamic Characteristics of Wing-body-vortex Interactions in Insects' Flapping Flight

Unsteady Aerodynamics and Wake Structures of Butterfly in Forward Flight

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