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Vortex development on pitching plates with lunate and truncate planforms

Published online by Cambridge University Press:  04 September 2013

Colin Hartloper  and
David E. Rival
Colin Hartloper
Affiliation:
Department of Mechanical Engineering, University of Calgary, Calgary, AB T4N 1N4, Canada
David E. Rival*
Affiliation:
Department of Mechanical Engineering, University of Calgary, Calgary, AB T4N 1N4, Canada
*
†Email address for correspondence: [email protected]
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Abstract

The three-dimensional flow field and instantaneous forces are measured on pitching rectangular, lunate and truncate planforms of aspect-ratio four. The leading-edge vortex on the rectangular planform is compressed as it grows, and subsequently forms an arch-shaped vortex. For the lunate and truncate planforms, which both have identical spanwise leading-edge curvature but differ in planform area, outboard-directed convection of vorticity, rather than vortex stretching, mitigates arch-vortex formation. The vortical near wake that is formed by the planforms with spanwise leading-edge curvature is found to be strongly correlated with a favourable lift-to-drag ratio during the force-relaxation phase.

JFM classification

Wakes/Jets: Separated flows Biological Fluid Dynamics: Swimming/flying
Type
Papers
Information
Journal of Fluid Mechanics , Volume 732 , 10 October 2013 , pp. 332 - 344
Copyright
©2013 Cambridge University Press 

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Hartloper and Rival supplementary movie

Isosurfaces of z-vorticity (red) and xy-vorticity (green) on rectangular, lunate and truncate planforms from left to right.

Download Hartloper and Rival supplementary movie(Video)
Video 8.9 MB

Hartloper and Rival supplementary movie

Isosurfaces of inboard-directed (yellow) and outboard-directed (blue) z-velocity on rectangular, lunate and truncate planforms from left to right.

Download Hartloper and Rival supplementary movie(Video)
Video 6.9 MB