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Visualization of a mechanism for three-dimensional interaction and near-wall eruption

Published online by Cambridge University Press:  10 September 1999

C. V. SEAL  and
C. R. SMITH
C. V. SEAL
Affiliation:
Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015, USA
C. R. SMITH
Affiliation:
Department of Mechanical Engineering and Mechanics, Lehigh University, Bethlehem, PA 18015, USA
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Abstract

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.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 394 , 10 September 1999 , pp. 193 - 203
Copyright
© 1999 Cambridge University Press

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