Author:
ANTONIA R. A.,ZHOU T.,ROMANO G. P.
Abstract
Measurements have been made in nominally two-dimensional turbulent wakes generated
by five different bluff bodies. Each wake has a different level of large-scale
organization which is reflected in different amounts of large-scale anisotropy. Structure
functions of streamwise (u) and lateral (v) velocity fluctuations at approximately the same
value of Rλ, the Taylor microscale Reynolds number, indicate that inertial-range
scales are significantly affected by the large-scale anisotropy. The effect is greater on v
than u and more pronounced for the porous-body wakes than the solid-body wakes.
In particular, ‘relative’ values of the scaling (or power-law) exponents indicate that
the magnitude of the transverse exponents can exceed that of the longitudinal ones
in the porous-body wakes. This is supported by the inertial-range behaviour of the
spectra of u and v. The difference between the transverse and longitudinal exponents
appears to depend on the large-scale anisotropy of the flow, as measured by the ratio
of the variances of v and u and ratio of the integral length scales of v and
u. The spanwise vorticity spectra are much less affected by the anisotropy than the spectra
of u and v.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
43 articles.
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