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On a Tollmien-Schlichting wave packet produced by a turbulent spot

Published online by Cambridge University Press:  19 April 2006

I. Wygnanski ,
J. H. Haritonidis  and
R. E. Kaplan
I. Wygnanski
Affiliation:
University of Southern California, Los Angeles Present address: School of Engineering, Tel Aviv University, Ramat Aviv, Tel Aviv, Israel.
J. H. Haritonidis
Affiliation:
University of Southern California, Los Angeles
R. E. Kaplan
Affiliation:
University of Southern California, Los Angeles
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Abstract

Experimental investigations in the region following the passage of an isolated turbulent spot in a laminar boundary layer reveal the existence of a pair of oblique wave packets. These packets are swept at an angle of approximately 40°, and exhibit frequency and wave speed characteristics in agreement with predictions made for oblique Tollmien-Schlichting waves. No waves exist near the centreline of the spot.

Several observations of the breakdown of this ordered motion into a new turbulent spot are shown. This breakdown is accompanied by the appearance of an intense shear layer inclined to the wall.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 92 , Issue 3 , 12 June 1979 , pp. 505 - 528
Copyright
© 1979 Cambridge University Press

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