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Aerodynamic sound generation by turbulence in shear flows

Khujadze, George and Chagelishvili, George and Oberlack, Martin and Tevzadze, Alexander and Bodo, G.
Eckhardt, Bruno (ed.) (2009):
Aerodynamic sound generation by turbulence in shear flows.
In: Advances in Turbulence XII : Proceedings of the 12th EUROMECH European Turbulence Conference, Berlin Heidelberg, Springer, pp. 867-870, DOI: 10.1007/978-3-642-03085-7_208,
[Online-Edition: http://dx.doi.org/10.1007/978-3-642-03085-7_208],
[Book Section]

Abstract

The nonlinear aerodynamic sound generation by turbulence has been long analyzed since the foundation of the theory of aerodynamic sound in pioneering paper by Lighthill 1. Also, it was Lighthill 2 who noted that velocity shear can increase the acoustic wave emission in the aerodynamic situation due to the existence of linear terms in the inhomogeneous part of the analogy equations (second derivative of the Reynolds stress). In 3 it was disclosed and described a linear aerodynamic sound generation mechanism. Specifically, it was shown that the flow non-normality induced linear phenomenon of the conversion of vortex mode into the acoustic wave mode is the only contributor to the acoustic wave production of the unbounded shear flows in the linear regime. From the physical point of view the potential vorticity was identified as the linear source of acoustic waves in shear flows.

Item Type: Book Section
Erschienen: 2009
Editors: Eckhardt, Bruno
Creators: Khujadze, George and Chagelishvili, George and Oberlack, Martin and Tevzadze, Alexander and Bodo, G.
Title: Aerodynamic sound generation by turbulence in shear flows
Language: English
Abstract:

The nonlinear aerodynamic sound generation by turbulence has been long analyzed since the foundation of the theory of aerodynamic sound in pioneering paper by Lighthill 1. Also, it was Lighthill 2 who noted that velocity shear can increase the acoustic wave emission in the aerodynamic situation due to the existence of linear terms in the inhomogeneous part of the analogy equations (second derivative of the Reynolds stress). In 3 it was disclosed and described a linear aerodynamic sound generation mechanism. Specifically, it was shown that the flow non-normality induced linear phenomenon of the conversion of vortex mode into the acoustic wave mode is the only contributor to the acoustic wave production of the unbounded shear flows in the linear regime. From the physical point of view the potential vorticity was identified as the linear source of acoustic waves in shear flows.

Title of Book: Advances in Turbulence XII : Proceedings of the 12th EUROMECH European Turbulence Conference
Series Name: Springer Proceedings in Physics
Number: 132
Place of Publication: Berlin Heidelberg
Publisher: Springer
ISBN: 978-3-642-03085-7
Uncontrolled Keywords: Physics
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
Date Deposited: 24 Aug 2011 18:21
DOI: 10.1007/978-3-642-03085-7_208
Official URL: http://dx.doi.org/10.1007/978-3-642-03085-7_208
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