Author:
HAMMOND D. A.,REDEKOPP L. G.
Abstract
The two-dimensional wake–shear layer forming behind a
rectangular-based forebody with independent ambient streams on either
side of the forebody is examined by direct numerical simulation.
Theoretical aspects of global modes and frequency selection criteria
based on local and global stability arguments are tested by computing
local stability properties using local, time-averaged velocity profiles
obtained from the numerical simulations and making the parallel-flow
approximation. The theoretical results based on the assumption of a
slightly non-parallel, spatially developing flow are shown to provide a
firm basis for the frequency selection of vortex shedding and for
defining the conditions for its onset. Distributed suction or blowing
applied at the base of the forebody is used as a means of wake flow
modification. The critical suction velocity to suppress vortex shedding
is calculated. It is shown that local directional control (i.e.
vectoring) of the near-wake flow is possible, but only when all global
modes are suppressed.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
109 articles.
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