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Keywords: aerodynamics
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Journal Articles
J Exp Biol (2021) 224 (10): jeb230920.
Published: 27 May 2021
... particle image velocimetry, with a horizontal measurement volume placed below the animals, to show that the wake shed by hovering hawkmoths is best described as a series of bilateral, stacked vortex ‘rings’. While the upstroke is aerodynamically active, despite an inclined stroke plane, it produces weaker...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (16): jeb204057.
Published: 21 August 2019
... morphology Behaviour Geometric morphometrics Aerodynamics Lepidoptera Understanding the evolution of wing morphology requires estimating the impact of wing shape variation on fitness-related behaviours. In butterflies, the capacity to fly enabled by wing morphology is crucial throughout adult...
Includes: Supplementary data
Journal Articles
J Exp Biol (2019) 222 (3): jeb176263.
Published: 4 February 2019
...Marc A. Badger; Hao Wang; Robert Dudley ABSTRACT Flying organisms frequently confront the challenge of maintaining stability when moving within highly dynamic airflows near the Earth's surface. Either aerodynamic or inertial forces generated by appendages and other structures, such as the tail, may...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (19): jeb171199.
Published: 4 October 2018
...Csaba Hefler; Huihe Qiu; Wei Shyy ABSTRACT We investigated the characteristics of interwing aerodynamic interactions across the span of the high aspect ratio, flexible wings of dragonflies under tethered and free-flying conditions. This revealed that the effects of the interactions on the hindwings...
Includes: Supplementary data
Journal Articles
J Exp Biol (2017) 220 (20): 3751–3762.
Published: 15 October 2017
... by minimizing tactile signals exerted on the host's skin. We studied this trade-off between escape speed and stealth in the malaria mosquito Anopheles coluzzii using 3D motion analysis of high-speed stereoscopic videos of mosquito take-offs and aerodynamic modeling. We found that during the push-off phase...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (22): 3532–3543.
Published: 15 November 2016
... represent large and small species, respectively. We first estimated the aerodynamic forces, moments and the mechanical power of escape manoeuvres using measured wing kinematics. Comparing active-manoeuvring and passive-damping aerodynamic moments, we found that pitch dynamics were lightly damped...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (10): 1572–1581.
Published: 15 May 2016
...Marco KleinHeerenbrink; Kajsa Warfvinge; Anders Hedenström ABSTRACT Gliding flight is a relatively inexpensive mode of flight used by many larger bird species, where potential energy is used to cover the cost of aerodynamic drag. Birds have great flexibility in their flight configuration, allowing...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (9): 1369–1377.
Published: 1 May 2016
... available from the flight muscles (estimated using an aerodynamic analysis) was inversely related to WL. This could simply be because birds with a higher WL have relatively smaller flight muscles. Alternatively or additionally, variation in the aerodynamic load on the wing resulting from differences in wing...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (20): 3295–3307.
Published: 1 October 2015
...Ruben Berthé; Fritz-Olaf Lehmann ABSTRACT The precise control of body posture by turning moments is key to elevated locomotor performance in flying animals. Although elevated moments for body stabilization are typically produced by wing aerodynamics, animals also steer using drag on body appendages...
Journal Articles
J Exp Biol (2015) 218 (9): 1393–1401.
Published: 1 May 2015
... and that they exert active control over the aerodynamic forces they experience during their descent, despite their apparent lack of specialized control surfaces. * Author for correspondence ( yomunk@uw.edu ) Competing interests The authors declare no competing or financial interests. 22 4 2014...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (6): 864–875.
Published: 15 March 2015
... of fruit flies ( Drosophila hydei ), using high-speed 3D videography to track body and wing kinematics and a dynamically scaled robot to study the production of aerodynamic forces and moments. Although the size, degree and speed of the saccades vary, the dynamics of the maneuver are remarkably stereotypic...
Includes: Supplementary data
Journal Articles
J Exp Biol (2015) 218 (5): 653–663.
Published: 1 March 2015
..., both the magnitude and time-history of aerodynamic forces can be estimated. At most speeds the downstroke generates both lift and thrust, whereas the function of the upstroke changes with forward flight speed. At hovering and slow speed bats use a leading edge vortex to enhance the lift beyond...
Journal Articles
J Exp Biol (2015) 218 (3): 480–490.
Published: 1 February 2015
... the underlying kinematics and resulting aerodynamic mechanisms of low speed turning flight in the pigeon ( Columba livia ). Three birds were trained to perform 90 deg level turns in a stereotypical fashion and detailed three-dimensional (3D) kinematics were recorded at high speeds. Applying the angular momentum...
Includes: Supplementary data
Journal Articles
J Exp Biol (2014) 217 (21): 3898–3909.
Published: 1 November 2014
...Arvind Santhanakrishnan; Alice K. Robinson; Shannon Jones; Audrey Ann Low; Sneha Gadi; Tyson L. Hedrick; Laura A. Miller The aerodynamics of flapping flight for the smallest insects such as thrips is often characterized by a ‘clap and fling’ of the wings at the end of the upstroke and the beginning...
Includes: Supplementary data
Journal Articles
J Exp Biol (2013) 216 (11): 2017–2030.
Published: 1 June 2013
...E. Salcedo; C. Treviño; R. O. Vargas; L. Martínez-Suástegui SUMMARY An experimental investigation of near field aerodynamics of wind dispersed rotary seeds has been performed using stereoscopic digital particle image velocimetry (DPIV). The detailed three-dimensional flow structure of the leading...
Journal Articles
J Exp Biol (2013) 216 (2): 303–318.
Published: 15 January 2013
...@aerodyne.technion.ac.il ) 24 5 2012 5 9 2012 © 2013. 2013 laminar-to-turbulent transition separation-induced transition low Reynolds number flow aerodynamics hummingbird flight Since Weis-Fogh's ( Weis-Fogh, 1973 ) pioneering analysis of hovering animal flight, it has generally been...
Journal Articles
J Exp Biol (2011) 214 (17): 2832–2844.
Published: 1 September 2011
... horizontal). In the present paper, wing and body kinematics of four freely hovering true hoverflies were measured using three-dimensional high-speed video. The measured wing kinematics was used in a Navier–Stokes solver to compute the aerodynamic forces of the insects. The stroke amplitude of the hoverflies...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2011) 214 (3): 382–393.
Published: 1 February 2011
... for correspondence at present address: Animal Flight Group, Department of Zoology, University of Oxford, Oxford OX1 3PS, UK ( per.henningsson@zoo.ox.ac.uk ) 28 9 2010 © 2011. 2011 common swift Apus apus aerodynamics gliding flight wake wind tunnel digital particle image velocimetry DPIV...
Journal Articles
J Exp Biol (2011) 214 (3): 432–444.
Published: 1 February 2011
...Xue Guang Meng; Lei Xu; Mao Sun SUMMARY We have examined the aerodynamic effects of corrugation in model insect wings that closely mimic the wing movements of hovering insects. Computational fluid dynamics were used with Reynolds numbers ranging from 35 to 3400, stroke amplitudes from 70 to 180 deg...
Journal Articles
J Exp Biol (2010) 213 (24): 4180–4192.
Published: 15 December 2010
...Sebastian Ruck; Herbert Oertel, Jr SUMMARY A three-dimensional numerical avian model was developed to investigate the unsteady and turbulent aerodynamic performance of flapping wings for varying wingbeat frequencies and flow velocities (up to 12 Hz and 9 m s –1 ), corresponding to a reduced...