Flapping Aerodynamics and Ground Effect

Chabalko, Christopher; Fitzgerald, Timothy; Valdez, Marcelo Federico; Balachandran, Balakumar

doi:10.2514/6.2012-420

Cited by 11 publications

(5 citation statements)

References 5 publications

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“…This is reversed in the opposite direction of translation. The test section floor is ≈6 chords below the plate's trailing edge, which minimizes the influence of ground effect [12]. The test section walls are ≈1.5 chords away from the model.…”

Section: Methodsmentioning

confidence: 99%

Free-to-Pivot Flat Plates in Hover for Reynolds Numbers 14 to 21,200

Granlund

Bernal

2014

AIAA Journal

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Section: Methodsmentioning

confidence: 99%

Free-to-Pivot Flat Plates in Hover for Reynolds Numbers 14 to 21,200

Granlund

Bernal

2014

AIAA Journal

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“…The unsteady flow around the flat-plate airfoil is modeled using an inviscid, potential flow model, based on the unsteady vortex lattice method (UVLM). This method has been used extensively to determine aerodynamic loads and aeroelastic responses [9,10,[12][13][14][15][16][17][18][23][24][25]. Fitzgerald et al [12] implemented two computational approaches with different fidelity levels to examine flexible hovering wings.…”

Section: Aerodynamic Modeling Of Hovering Flights 21 Unsteady Vortementioning

confidence: 99%

“…Different flow models have been used to predict the aerodynamic behavior of flapping wings within the required accuracy and computational cost [3,5,[8][9][10][11]. For instance, several research efforts have considered the use of the unsteady vortex lattice method for the analysis of flapping wings in forward and hovering flights [9,10,[12][13][14][15][16][17][18]. In a review paper, Shyy et al [2] presented a literature survey on the main progress in flapping-wing aerodynamics and aeroelasticity.…”

Section: Introductionmentioning

confidence: 99%

Global-Local Optimization of Flapping Kinematics in Hovering Flight

Ghommem

Hajj

Mook

et al. 2013

International Journal of Micro Air Vehicles

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The kinematics of a hovering wing are optimized by combining the 2-d unsteady vortex lattice method with a hybrid of global and local optimization algorithms. The objective is to minimize the required aerodynamic power under a lift constraint. The hybrid optimization is used to efficiently navigate the complex design space due to wing-wake interference present in hovering aerodynamics. The flapping wing is chosen so that its chord length and flapping frequency match the morphological and flight properties of two insects with different masses. The results suggest that imposing a delay between the different oscillatory motions defining the flapping kinematics, and controlling the way through which the wing rotates at the end of each half stroke can improve aerodynamic power under a lift constraint. Furthermore, our optimization analysis identified optimal kinematics that agree fairly well with observed insect kinematics, as well as previously published numerical results.

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“…The latter investigated the ground effect for single and tandem wings for dragonfly kinematics with ground effect and this revealed the presence of a rebound vortex and its effect on the shed LEV, giving rise to enhanced force. Furthermore, other studies focused on the partial ground effect [10] and wavy platforms [11]. Moreover, take-off studies [12,13] on flapping foil show results regarding increased lift during take-off.…”

Section: Introductionmentioning

confidence: 98%

Can the ground enhance vertical force for inclined stroke plane flapping wing?

Shanmugam

Vengadesan

2021

Bioinspir. Biomim.

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The numerical investigation of 2D insect wing kinematics in an inclined stroke plane is carried out using an immersed boundary solver. The effect of vortex shedding and dipole jet on the vertical force generation by the flapping wing due to change in the stroke plane angle is investigated in the vicinity of the ground. The results of instantaneous force and vorticity contours reveal the underlying lift enhancement mechanisms for the inclined stroke plane flapping wing. Moreover, they aid in the understanding of the wake-ground interaction and the associated shear layers. The calculated average vertical force delineates different force trends for the inclined stroke plane flapping near the ground. Furthermore, the dipole jet patterns are analyzed for different heights. These patterns are found to be a better tool to assess the kinematics for the vertical force enhancement and reduction, especially at intermediate heights. Vertical force enhancement is the critical parameter in the design of the micro aerial vehicle (MAV). Through this study, it is certain that the dipole jet has the potential to be used as a lift modification mechanism in MAVs. In summary, the study gives a holistic view of the physics of the inclined plane kinematics near the ground and serves as the basis for the design of MAVs.

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Flapping Aerodynamics and Ground Effect

Cited by 11 publications

References 5 publications

Free-to-Pivot Flat Plates in Hover for Reynolds Numbers 14 to 21,200

Free-to-Pivot Flat Plates in Hover for Reynolds Numbers 14 to 21,200

Global-Local Optimization of Flapping Kinematics in Hovering Flight

Can the ground enhance vertical force for inclined stroke plane flapping wing?

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