Journal ArticleDOI
Effects of sound on flow separation from blunt flat plates
R. Parker,M.C. Welsh +1 more
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In this article, the effect of sound on the flow around plates with semicircular or square leading edges and square trailing edges located in a low turbulence open jet has been studied, and the length of the leading edge separation bubbles associated with square leading edge plates was found to oscillate.About:
This article is published in International Journal of Heat and Fluid Flow.The article was published on 1983-06-01. It has received 122 citations till now. The article focuses on the topics: Leading edge & Strouhal number.read more
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Journal ArticleDOI
Strouhal numbers of rectangular cylinders at incidence: a review and new data
TL;DR: In this article, the Strouhal number of a family of rectangular cylinders with side ratios (B/D) ranging from 0·04 to 1·0 and with angles of attack from 0° to 90° are presented.
Journal ArticleDOI
The Structure and Control of a Turbulent Reattaching Flow
Abstract: An experimental study was made of the effect of a periodic velocity perturbation on the separation bubble downstream of the sharp-edged blunt face of a circular cylinder aligned coaxially with the free stream. Velocity fluctuations were produced with an acoustic driver located within the cylinder and a small circumferential gap located immediately downstream of the fixed separation line to allow communication with the external flow. The flow could be considerably modified when forced at frequencies lower than the initial Kelvin-Helmholtz frequencies of the free shear layer, and with associated vortex wavelengths comparable to the bubble height. Reattachment length, bubble height, pressure at separation, and average pressure on the face were all reduced. The effects on the large-scale structures were studied on flow photographs obtained by the smoke-wire technique. The forcing increased the entrainment near the leading edge. It was concluded that the final vortex of the shear layer before reattachment is an important element of the flow structure. There are two different instabilities involved, the Kelvin-Helmholtz instability of the free shear layer and the “shedding” type instability of the entire bubble. A method of frequency scaling is proposed which correlates data for a variety of bubbles and supports an analogy with Karman vortex shedding.
Journal ArticleDOI
Experiments on vortex shedding from flat plates with square leading and trailing edges
TL;DR: In this paper, the Strouhal number is shown to be approximately constant and equal to 0.6 for flat plates with square leading and trailing edges having chord-to-thickness ratios 3-16 at Reynolds numbers (1-3) × 103.
Journal ArticleDOI
Benchmark on the Aerodynamics of a Rectangular 5:1 Cylinder: An overview after the first four years of activity
TL;DR: In this article, the results of about 70 realizations of the BARC flow configuration obtained under a nominally common set-up in both wind tunnel experiments and numerical simulations are compared among themselves and with the data available in the literature prior to BARC, in terms of bulk parameters, flow and aerodynamic load statistics, pressure and force spanwise correlations.
Journal ArticleDOI
Acoustic streaming: from Rayleigh to today
Said Boluriaan,Philip J. Morris +1 more
TL;DR: The significant lack of understanding in the general area of fast streaming is noted, and the importance of the use of direct numerical simulations in the study of nonlinear streaming is emphasized.
References
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Flow-Induced Vibration
R. D. Blevins,H. Saunders +1 more
TL;DR: In this paper, the authors focus on applications for offshore platforms and piping; wind-induced vibration of buildings, bridges, and towers; and acoustic and mechanical vibration of heat exchangers, power lines, and process ducting.
Journal ArticleDOI
The mechanics of the formation region of vortices behind bluff bodies
TL;DR: In this article, the authors examined the characteristic lengths of the oscillating wakes of bluff bodies and concluded that these are equivalent at high Reynolds number, leading to the conclusion that there are two simultaneous characteristic lengths; the scale of the formation region and the width to which the free shear layers diffuse.
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On spatially growing disturbances in an inviscid shear layer
TL;DR: In this paper, the authors used the hyperbolic-tangent velocity profile of the disturbed shear layer to obtain better agreement with experimental results by means of the inviscid linearized stability theory of spatially growing disturbances.
Journal ArticleDOI
Contributions to the theory of aerodynamic sound, with application to excess jet noise and the theory of the flute
TL;DR: In this article, a reformulation of the Lighthill (1952) theory of aerodynamic sound is described, and the form of the acoustic propagation operator is established for a non-uniform mean flow in the absence of vortical or entropy gradient source terms.
On the drag and shedding frequency of two-dimensional bluff bodies
TL;DR: In this paper, a semi-empirical study of the bluff body problem is presented, where interference elements in the wake close behind a cylinder demonstrate the need for considering that region in any complete theory.