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Keywords: vortex
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Journal Articles
J Exp Biol (2020) 223 (15): jeb219873.
Published: 4 August 2020
... image velocimetry (PIV) revealed that the formation of a vortex, rather than the expulsion of fluid between two closing body surfaces, generates propulsion in rusty crayfish. PIV also revealed that the pleopods (ventral abdominal appendages) contribute to the momentum generated by the tail. To our...
Includes: Supplementary data
Journal Articles
J Exp Biol (2018) 221 (11): jeb168773.
Published: 12 June 2018
... ). Therefore, turbulence should be distinguished from highly periodic coherent structures such as waves or vortex streets. These structures may be influenced by turbulence or have turbulence superimposed upon them, but are not themselves ‘turbulent’. The response of fish to these ‘altered’ or complex flows...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (24): 3884–3895.
Published: 15 December 2016
.... Hydrodynamics Biomechanics Propulsion Fish Vortex Flexible bending Aquatic animals significantly outperform man-made aquatic vehicles because they are able to move in water with greater efficiency and maneuverability ( Bandyopadhyay, 2005 ; Gemmell et al., 2013 ). Animals achieve these performance...
Includes: Supplementary data
Journal Articles
J Exp Biol (2011) 214 (13): 2283–2291.
Published: 1 July 2011
...Daegyoum Kim; Morteza Gharib SUMMARY Several characteristics of drag-based paddling propulsion are studied with a simple mechanical model and a measurement technique for mapping three-dimensional flow fields. In drag-based propulsion, the temporal change of the vortex strength is an important...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2008) 211 (19): 3147–3159.
Published: 1 October 2008
..., according to the principle of conservation of mass. Three vortices (designated with white 1, 2 and 4 ) were observed ( Fig. 5A ) adjacent to the dorsal and ventral CFP jets. The dorsal CFP jet was the central jet of the 1 and 2 vortex pair. At this instant, vortex 2 was structurally shared...
Journal Articles
J Exp Biol (2008) 211 (2): 280–287.
Published: 15 January 2008
..., quasi-steady flow is assumed and the flow analysis is based on velocity and/or vorticity fields measured at a single time instant during the stroke cycle. The assumption of quasi-steady flow leads to neglect of unsteady (time-dependent) wake vortex added-mass effects,which can contribute significantly...
Journal Articles
J Exp Biol (2007) 210 (4): 685–698.
Published: 15 February 2007
... model provides an approach to empirically deduce swimming and flying forces based on the measurement of velocity and vortex added-mass in the animal wake. The model is contingent on the identification of the vortex boundary in the wake. This paper demonstrates the application of that method to a case...
Journal Articles
J Exp Biol (2005) 208 (18): 3519–3532.
Published: 15 September 2005
...-mass contribution from fluid surrounding vortices in the wake, and proceeds identically to a measurement of the added-mass traditionally associated with fluid surrounding solid bodies. It is demonstrated that the velocity/pressure perspective is equivalent to the vorticity/vortex-added-mass approach...
Journal Articles
J Exp Biol (2005) 208 (2): 327–344.
Published: 15 January 2005
...,and formed below the keels and increased in circulation as pitch angle became more negative. Vortices also formed along the eye ridges of all boxfishes. In the spotted boxfish, which is largely trapezoidal in cross section, consistent dorsal vortex growth posterior to the eye ridge was also present. When all...
Journal Articles
J Exp Biol (2003) 206 (6): 1059–1073.
Published: 15 March 2003
.... During this gait,body amplitudes and curvatures are much larger than those of trout swimming at an equivalent flow velocity in the absence of a cylinder. Tail-beat frequency is not only lower than might be expected for a trout swimming in the reduced flow behind a cylinder, but also matches the vortex...
Includes: Multimedia, Supplementary data
Journal Articles
J Exp Biol (2002) 205 (10): 1389–1409.
Published: 15 May 2002
...Tyson L. Hedrick; Bret W. Tobalske; Andrew A. Biewener SUMMARY Birds and bats are known to employ two different gaits in flapping flight,a vortex-ring gait in slow flight and a continuous-vortex gait in fast flight. We studied the use of these gaits over a wide range of speeds (1-17 ms -1...
Journal Articles
J Exp Biol (1989) 142 (1): 1–15.
Published: 1 March 1989
.... For example, the energy of vortex rings generated by slow-flying pigeons has been used to calculate induced power (Spedding, 1981; Spedding et al. Key words: bird, flight, vortex, wake. C. J. PENNYCUICK Fig. 1. (A) Motion assumed in Rayner's (1986) theory of the constant-circulation wake - wing span constant...