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On the persistence of memory: do initial conditions impact vortex formation?

Published online by Cambridge University Press:  01 November 2013

Jochen Kriegseis ,
Matthias Kinzel  and
David E. Rival
Jochen Kriegseis
Affiliation:
Department of Mechanical Engineering, University of Calgary, Calgary, T2N 1N4, Canada
Matthias Kinzel
Affiliation:
Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA
David E. Rival*
Affiliation:
Department of Mechanical Engineering, University of Calgary, Calgary, T2N 1N4, Canada
*
†Email address for correspondence: [email protected]
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Abstract

An investigation into redistribution of vorticity for rapidly accelerating plates with varying kinematics and initial conditions has been performed. Both three-dimensional particle tracking velocimetry and direct force measurements were applied simultaneously. The effective velocity of the feeding shear layer has been identified as the appropriate characteristic velocity rather than the commonly used plunge or free stream velocity. Based on this new normalization for circulation, it has been demonstrated that the existence of initial boundary-layer vorticity on the plunging plate – at least in the near-midplane region – does not contribute to the eventual vortex formation process. In accordance with the literature, however, the tip vortex positioning relative to the plate surface has been identified as an important contributor in the overall force production, particularly once the plate acceleration has ceased.

JFM classification

Low-Reynolds-number flows: Low-Reynolds-number flows Vortex Flows: Vortex Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 736 , 10 December 2013 , pp. 91 - 106
Copyright
©2013 Cambridge University Press 

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