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RESEARCH PAPERS

Turbulent Vortex Ring/Free Surface Interaction

[+] Author and Article Information
A. Weigand, M. Gharib

Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125

J. Fluids Eng 117(3), 374-381 (Sep 01, 1995) (8 pages) doi:10.1115/1.2817272 History: Received October 17, 1994; Revised December 19, 1994; Online December 04, 2007

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 Re0 = 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.

Copyright © 1995 by The American Society of Mechanical Engineers
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