Scaling Parameters for a Time-Averaged Separation Bubble

[+] Author and Article Information
A. J. Smits

Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, N.J. 08540

J. Fluids Eng 104(2), 178-184 (Jun 01, 1982) (7 pages) doi:10.1115/1.3241805 History: Received January 01, 1981; Online October 26, 2009


A splitter plate is placed in the wake of a two-dimensional bluff body. The splitter plate is long enough for the separated flow behind the body to reattach on the splitter plate. The time-averaged properties of this “closed” separation bubble are investigated under a wide range of kinematic conditions. It is found that blockage reduces the base pressure coefficient (Cpb ) and the distance to reattachment (l) but the relationship between l and Cpb is not obvious. The pressure distribution in the separated zone, scaled on Cpb and l, can be described by a universal curve. The usefulness of a slotted wall in reducing blockage effects on bluff body flows is shown to be limited in that the wall porosity affects only some properties of the separation bubble.

Copyright © 1982 by ASME
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