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On the perseverance of a quasi-two-dimensional eddy-structure in a turbulent mixing layer

Published online by Cambridge University Press:  19 April 2006

I. Wygnanski ,
D. Oster ,
H. Fiedler  and
B. Dziomba
I. Wygnanski
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Israel
D. Oster
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Israel
H. Fiedler
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Israel Present address: Hermann-Föttinger-Institut, Technische Universität, Berlin.
B. Dziomba
Affiliation:
School of Engineering, Tel-Aviv University, Ramat-Aviv, Israel
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Abstract

Strong external disturbances were introduced into a mixing layer in order to test the formation of the quasi two-dimensional coherent eddies and their survival under less than ideal conditions. Velocity and temperature correlation measurements, flow visualization, and the simultaneous use of a large number of sensors suggest that these eddies are very stable in the range of Reynolds numbers considered and they persevere in spite of the external buffeting imposed. Some measurements were carried out in a mixing layer between two parallel streams and some in a mixing layer entraining quiescent surrounding fluid. In both cases the large eddies could be described. as vortex rolls spanning the test section; these rolls may be contorted and sometimes skewed, but they are basically two-dimensional.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 93 , Issue 2 , 26 July 1979 , pp. 325 - 335
Copyright
© 1979 Cambridge University Press

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Footnotes

Sponsored by Deutsche Forschungsgemeinschaft.

References

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