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Turbulent vortex ring/free surface interaction

Weigand, A. and Gharib, M. (1995) Turbulent vortex ring/free surface interaction. Journal of Fluids Engineering, 117 (3). pp. 374-381. ISSN 0098-2202. doi:10.1115/1.2817272.

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The interaction of turbulent vortex rings that approach a clean water surface under various angles is experimentally investigated. The temporal evolution of the vortex rings with an initial Reynolds number of Re_0 = 7500 is characterized by the laminar/turbulent transition and asymptotic relaminarization of the flow. Using the shadowgraph technique, two major flow cases were identified as a result of the vortex-ring/free-surface interaction: a trifurcation case that results from the interaction during the transition stage, and a bifurcation case that evolves during the fully-developed turbulent stage. In contrast to the laminar interaction, the turbulent bifurcation pattern is characterized by the reconnection and mutual interaction of many small-scale structures. Simultaneous digital particle image velocimetry (DPIV) and shadowgraph measurements reveal that the evolution of the small-scale structures at the free surface is strongly dominated by the bifurcation pattern, which in turn is a consequence of the persisting laminar sublayer in the core regions of the reconnected turbulent vortex loops.

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Additional Information:© 1995 ASME. Contributed by the Fluids Engineering Division for publication in the Journal of Fluids Engineering. Manuscript received by the Fluids Engineering Division October 17, 1994: revised manuscript received December 19, 1994. Associate Technical Editor: D. P. Telionis. This work has been sponsored by the Office of Naval Research under the ONR-URl grant N00014-92-J-1610.
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Office of Naval Research (ONR)N00014-92-J-1610
Issue or Number:3
Record Number:CaltechAUTHORS:20130916-112208067
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Official Citation:Weigand AA, Gharib MM. Turbulent Vortex Ring/Free Surface Interaction. J. Fluids Eng.. 1995;117(3):374-381. doi:10.1115/1.2817272
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41342
Deposited By: Tony Diaz
Deposited On:16 Sep 2013 20:53
Last Modified:10 Nov 2021 04:28

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