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Flow field around a vibrating cantilever: coherent structure eduction by continuous wavelet transform and proper orthogonal decomposition

Published online by Cambridge University Press:  08 February 2011

Y.-H. KIM ,
C. CIERPKA  and
S. T. WERELEY
Y.-H. KIM
Affiliation:
Energy Business Department, Growth and Investment Division, POSCO, 892 Daechi 4-dong Gangnam-gu, Seoul 135-777, South Korea
C. CIERPKA*
Affiliation:
Institute for Fluid Dynamics and Aerodynamics, University of the Federal Arms Munich, Werner-Heisenberg-Weg 39, 85577 Neubiberg, Germany
S. T. WERELEY
Affiliation:
Department of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-1288, USA
*
†Email address for correspondence: [email protected]
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Abstract

The velocity field around a vibrating cantilever plate was experimentally investigated using phase-locked particle image velocimetry. Experiments were performed at Reynolds numbers of Reh = 101, 126 and 146 based on the tip amplitude and the speed of the cantilever. The averaged vector fields indicate a pseudo-jet flow, which is dominated by vortical structures. These vortical structures are identified and characterized using the continuous wavelet transform. Three-dimensional flow features are also clearly revealed by this technique. Furthermore, proper orthogonal decomposition was used to investigate regions of vortex production and breakdown. The results show clearly that the investigation of phase-averaged data hides several key flow features. Careful data post-processing is therefore necessary to investigate the flow around the vibrating cantilever and similar highly transient periodic flows.

JFM classification

Wakes/Jets: Shear layers Vortex Flows: Vortex dynamics Vortex Flows: Vortex shedding
Type
Papers
Information
Journal of Fluid Mechanics , Volume 669 , 25 February 2011 , pp. 584 - 606
Copyright
Copyright © Cambridge University Press 2011

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Footnotes

The first and the second author contributed equally to the paper.

References

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