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. https://resolver.caltech.edu/CaltechAUTHORS:20130916-112208067
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Abstract
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. | |||||||||
| Group: | GALCIT | |||||||||
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| Issue or Number: | 3 | |||||||||
| DOI: | 10.1115/1.2817272 | |||||||||
| Record Number: | CaltechAUTHORS:20130916-112208067 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20130916-112208067 | |||||||||
| 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 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 16 Sep 2013 20:53 | |||||||||
| Last Modified: | 10 Nov 2021 04:28 |
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