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Flexibility effects on vortex formation of translating plates

Kim, Daegyoum and Gharib, Morteza (2011) Flexibility effects on vortex formation of translating plates. Journal of Fluid Mechanics, 677 . pp. 255-271. ISSN 0022-1120.

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Vortex structures made by impulsively translating low aspect-ratio plates are studied experimentally using defocusing digital particle image velocimetry. The investigation of translating plates with a 90° angle of attack is important since it is a fundamental model for a better understanding of drag-based propulsion systems. Rectangular flat rigid, flexible and curved-rigid thin plates with the same aspect ratio are studied in order to develop qualitative and quantitative understanding of their vortex structures and hydrodynamic forces. We find that the vortex formation processes of all three cases are drastically different from each other. The interaction of leading-edge vortices and tip flow near the tip region is an important mechanism to distinguish vortex patterns among these three cases. The drag trends of three cases are correlated closely with vortex structure and circulation. The initial peak of hydrodynamic force in the flexible plate case is not as large as the initial peak of the flat and curved rigid plate cases during the acceleration phase. However, after the initial peak, the flexible plate generates a large force comparable to that of the flat-rigid plate case in spite of its deformed shape, which results from the slow development of the vortex structure.

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Gharib, Morteza0000-0002-2204-9302
Additional Information:© 2011 Cambridge University Press. Published online: 18 April 2011.
Subject Keywords:propulsion; swimming/flying; vortex dynamics
Record Number:CaltechAUTHORS:20110711-134704485
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Official Citation:Title: Flexibility effects on vortex formation of translating plates Author(s):DAEGYOUM KIM, GHARIB MORTEZA Online Publication date: 2011 Volume: 677 Start page:255 Publication: Journal of Fluid Mechanics DOI: 10.1017/jfm.2011.82 URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24364
Deposited By: Tony Diaz
Deposited On:12 Jul 2011 18:20
Last Modified:03 Oct 2019 02:55

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