An experimental configuration has been found which allows detailed observation of three-dimensional vortex-vortex and associated vortex-surface interactions which appear similar to those observed in fully turbulent flow. Hydrogen bubble visualization illustrates a complicated intertwining, or braiding, of two initially co-rotating vortices. It is observed that the three-dimensional interactions of the braided vortices induces a pair of local surface-fluid eruptions reminiscent of the 'bursting' behaviour characteristic of the near-wall regeneration process of fully turbulent boundary layers.
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Univ Calif Los Angeles, Dept Aerosp & Mech Engn, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Aerosp & Mech Engn, Los Angeles, CA 90095 USA
Le, AT
Coleman, GN
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Univ Calif Los Angeles, Dept Aerosp & Mech Engn, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Aerosp & Mech Engn, Los Angeles, CA 90095 USA
Coleman, GN
Kim, J
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Univ Calif Los Angeles, Dept Aerosp & Mech Engn, Los Angeles, CA 90095 USAUniv Calif Los Angeles, Dept Aerosp & Mech Engn, Los Angeles, CA 90095 USA