Journal ArticleDOI
Sound radiation due to unsteady dissipation in turbulent flows
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In this paper, scaling laws for dissipation noise were developed for hot air jets at velocities down to 0·25c0, with intensity proportional to U6 than by unsteady thermal dissipation.About:
This article is published in Journal of Sound and Vibration.The article was published on 1976-09-08. It has received 29 citations till now. The article focuses on the topics: Turbulence & Dissipation.read more
Citations
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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.
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Acoustic emissions by vortex motions
TL;DR: In this paper, three typical cases are presented as illustrative examples: (i) head-on collision of two vortex rings, (ii) a vortex ring moving near a circular cylinder, and (iii) vortex ring near a sharp edge of a semi-infinite plate.
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Sound radiation in turbulent channel flows
TL;DR: In this article, an expression for the power spectrum of the far-field pressure radiated per unit channel area using a rigid-boundary Green function was derived for the Poiseuille and Couette flow.
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Extensions of Lighthill's acoustic analogy with application to computational aeroacoustics
TL;DR: In this article, the Lighthill-9s aeroacoustic analogy is formulated for bounded domains in a general way that allows pressure-based alternatives to the fluid density as wave variable.
References
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Journal ArticleDOI
On Sound Generated Aerodynamically. I. General Theory
TL;DR: In this paper, a theory for estimating the sound radiated from a fluid flow, with rigid boundaries, which as a result of instability contains regular fluctuations or turbulence is initiated, based on the equations of motion of a gas.
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Basic principles of aerodynamic noise generation
TL;DR: In this paper, the authors give a simple, unified, analytical description of a wide range of mechanisms associated with the generation of sound by unsteady fluid motion, including radiation from compact and noncompact multipole sources, Lighthill's theory of sound emission from free turbulence, effects of source convection, sound generation from flow interaction with solid surfaces and inhomogeneities of the medium, and singular perturbation aspects of the aerodynamic sound problem.
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Measurements of subsonic jet noise and comparison with theory
TL;DR: In this paper, measurements of the noise field from a 25 mm diameter subsonic air jet were analyzed in some detail by determining both the jet velocity dependence and the directivity of the intensity of the radiation in 1/3-octave bands at particular values of the frequency parameter, showing that the predicted variations overestimate the measurements and it appears that the convective amplification predicted by the theory is much reduced.
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Amplification of aerodynamic noise by convected flow inhomogeneities
TL;DR: In this article, the authors used Lighthill's acoustic analogy to study the sound radiated from free flows without dissipation, in the limit as the sound speed tends to infinity.