Flight force production by flapping insect wings in inclined stroke plane kinematics

Sudhakar, Y.; Vengadesan, S.

doi:10.1016/j.compfluid.2009.11.004

Cited by 49 publications

(20 citation statements)

References 48 publications

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“…They are shown in figures 8(a), (b), (c) and (d). Comparison of instantaneous non-dimensional vertical force coefficient, as predicted by the present methodology, with a benchmark case reported by Sudhakar and Vengadesan [57] at Re = 150 for kinematics-2 is shown in figure 9.…”

Section: 4dmentioning

confidence: 79%

“…Validation study: Comparison of instantaneous nondimensional horizontal and vertical force coefficients, as predicted by the present methodology, with benchmark cases documented by Wang [56], Gao et al [17] and Sudhakar and Vengadesan [57] at Re = 157 for kinematics-1 are shown in figures 7(a) and (b), respectively.…”

Section: 4dmentioning

confidence: 91%

“…For kinematics-1 [17,56], the wing rotated continuously during the entire flapping cycle. For kinematics-2 [57], wing rotation was confined to 20% of the flapping cycle during pronation and supination. Angle made by the wing with the inclined stroke plane during upstroke and downstroke were 15°and 50.6°, respectively.…”

Section: Kinematicsmentioning

confidence: 99%

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Recurrence studies of insect-sized flapping wings in inclined-stroke plane under gusty conditions

Mathur

Vengadesan

2019

Sādhanā

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Global recurrence plots (GRPs) and windowed recurrence quantification analysis (WRQA) are two recurrence paradigms which find wide applications to detect the onset of instability in a dynamic system. The present work reports the attempt to employ these recurrence paradigms to assess the effect of frontal gust on the force patterns of an insect-sized flapping wing in the inclined-stroke plane. Horizontal and vertical forces generated by the flapping wing in the presence of gusts of the form u G u w ¼ u 1 u w þ u g u w sin 2p f g f w t were numerically estimated in the 2D reference frame for Re = 150. Nine gusts with combinations of the ratio of gust frequency to wing's flapping frequency, f g /f w = 0.1, 0.5 and 1 and ratio of gust velocity amplitude to root mean square averaged flapping velocity, u g /u w = 0.1, 0.5 and 1 were considered. Recurrence studies of the forces were carried out to find out the gusty condition, which would trigger an onset of unstable behaviour. Studies indicated a possible onset of instability in the force patterns for gust with f g /f w = 0.1 and u g /u w = 1. The onset of unstable behaviour was prominently captured by WRQA of the vertical force coefficient based on determinism (DET) and laminarity (LAM) series.

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Section: 4dmentioning

confidence: 79%

Section: 4dmentioning

confidence: 91%

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Recurrence studies of insect-sized flapping wings in inclined-stroke plane under gusty conditions

Mathur

Vengadesan

2019

Sādhanā

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“…The results of the corrugated airfoils are compared with flat plate and NACA 0015 airfoil. We observed that the vortices formed on the corrugated aerofoil and shed into its wakes produces lower integral force fluctuation because of the its upstream peak height which allows the flow to reattach near the trailing edge of the airfoil by delaying flow separation [10][11][12]. The aerodynamic performance i.e., (L/D) ratio of the modified wing -I (MW-I) is better compared to MW-II and NACA 0015 at 0° angle of attack.…”

Section: Discussionmentioning

confidence: 99%

Computational Analysis of Bio-Inspired Corrugated Airfoil with Varying Corrugation Angle

Ma¹,

Padhy²,

M³

et al. 2018

J Aeronaut Aerospace Eng

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“…3.1 Validation. The code developed based on the above scheme was validated for fluid flow characteristics by Sudhakar and Vengadesan [27,28]. The buoyancy driven flow was also validated in Raman et al [29].…”

Section: Problem Definition and Validationmentioning

confidence: 99%

Effect of Axis Ratio on Fluid Flow Around an Elliptic Cylinder—A Numerical Study

Raman¹,

Prakash²,

Vengadesan

2013

Journal of Fluids Engineering

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The bluff body simulations over canonical forms like circular and square cylinders are very well studied and the correlations for bulk parameters like mean drag coefficient and Strouhal numbers for the same are reported widely. In the case of elliptic cylinder, the literature is very sparse, especially for moderate Reynolds number (Re). Hence, in this work, a detailed study about fluid flow characteristics over an elliptic cylinder placed in a free stream is performed. Simulations are carried out for different Re ranging from 50 to 500 with axis ratio (AR) varied between 0.1 to 1.0 in steps of 0.1. Immersed boundary method is used for the solid boundary condition implementation which avoids the grid generation for each AR and a single Cartesian grid is used for all the simulations. The effect of AR for various Reynolds numbers is also focused on using the in-house code. The influence of AR is phenomenal for all the Re and the values of wake length, drag coefficient, and Strouhal number decrease with decreasing AR for a particular Re. The critical ARs, for vortex shedding and wake formation, are identified for various Re. Detailed correlations for wake length, critical ARs for vortex shedding and wake formation, mean drag coefficient and Strouhal number, in terms of AR, are reported in this work.

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Flight force production by flapping insect wings in inclined stroke plane kinematics

Cited by 49 publications

References 48 publications

Recurrence studies of insect-sized flapping wings in inclined-stroke plane under gusty conditions

Recurrence studies of insect-sized flapping wings in inclined-stroke plane under gusty conditions

Computational Analysis of Bio-Inspired Corrugated Airfoil with Varying Corrugation Angle

Effect of Axis Ratio on Fluid Flow Around an Elliptic Cylinder—A Numerical Study

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