Effects of weak free stream nonuniformity on boundary layer transition

Watmuff, J 2006, 'Effects of weak free stream nonuniformity on boundary layer transition', Journal of Fluids Engineering, vol. 128, no. 2, pp. 247-257.


Document type: Journal Article
Collection: Journal Articles

Title Effects of weak free stream nonuniformity on boundary layer transition
Author(s) Watmuff, J
Year 2006
Journal name Journal of Fluids Engineering
Volume number 128
Issue number 2
Start page 247
End page 257
Total pages 11
Publisher American Society of Mechanical Engineers
Abstract Experiments are described in which well-defined weak Free Stream Nonuniformity (FSN) is introduced by placing fine wires upstream of the leading edge of a flat plate. Large amplitude spanwise thickness variations form in the boundary layer as a result of the interaction between the steady laminar wakes from the wires and the leading edge. The centerline of a region of elevated layer thickness is aligned with the centerline of the wake in the freestream and the response is shown to be remarkably sensitive to the spanwise length-scale of the wakes. The region of elevated thickness is equivalent to a long narrow low speed streak in the layer. Elevated Free Stream Turbulence (FST) levels are known to produce randomly forming arrays of long narrow low speed streaks in laminar boundary layers. Therefore the characteristics of the streaks resulting from the FSN are studied in detail in an effort to gain some insight into bypass transition that occurs at elevated FST levels.
Subject Marine Engineering
Aerodynamics (excl. Hypersonic Aerodynamics)
Mechanical Engineering not elsewhere classified
Keyword(s) Transition
Tollmien-Schlichting waves
DOI - identifier 10.1115/1.2169813
ISSN 0098-2202
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