Author:
KIYA M.,SHIMIZU M.,MOCHIZUKI O.
Abstract
A turbulent separation bubble is forced by single- and double-frequency
sinusoidal
disturbances, with the emphasis placed on the reattachment length as a
function of the
forcing amplitude and frequency. The separation bubble is that
formed along the side
of a blunt circular cylinder with a square leading edge. In
single-frequency forcing, the
reattachment length attains a minimum at a particular forcing frequency,
F, which
scales with the frequency of shedding of vortices from the
reattachment region of the
separated shear layer. A flow model is presented to interpret the
frequency F. Forcing
of sufficiently high amplitude eliminates the recirculating region in a
range of the
forcing frequency. Flow visualization and a survey of the mean flow and
turbulence
properties demonstrate how the flow in the separated shear layer is modified
by the
forcing. In double-frequency forcing, the superposition of the
F-component on its
higher or subharmonic components is considered. A non-resonant combination
of the
two frequencies is also considered.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
72 articles.
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