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Streamwise vortices associated with the bursting phenomenon

Published online by Cambridge University Press:  19 April 2006

Ron F. Blackwelder  and
Helmut Eckelmann
Ron F. Blackwelder
Affiliation:
Department of Aerospace Engineering, University of Southern California, Los Angeles
This research was performed while at the Max-Planck-Institut für Strömungsforschung, Göttingen.
Helmut Eckelmann
Affiliation:
Lehrstuhl für Angewandte Mechanik und Strömungsphysik, University of Göttingen
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Abstract

The streamwise and spanwise velocity components and the gradients of these components normal to the wall were examined by using hot-film sensors and flush-mounted wall elements to study the vortex structures associated with the bursting phenomenon. Quadrant probability analysis and conditional sampling techniques indicated that pairs of counter-rotating streamwise vortices occur frequently in the wall region of a bounded turbulent shear flow. A streamwise momentum defect occurred between the vortices as low-speed fluid was ‘pumped’ away from the wall by the vortex pair. The defect region was long and narrow and possibly forms the low-speed streak as observed in visualization studies. The velocity defect was terminated by a strong acceleration followed by a high speed region.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 94 , Issue 3 , 16 October 1979 , pp. 577 - 594
Copyright
© 1979 Cambridge University Press

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