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Aerodynamic sound generation by turbulence in shear flows

Khujadze, George and Chagelishvili, George D. and Oberlack, Martin and Tevzadze, A. and Bodo, G. :
Aerodynamic sound generation by turbulence in shear flows.
In: Progress in Turbulence and Wind Energy. Springer Proceedings in physics, 4 (141). Springer-Verlag, Heidelberg, Berlin , pp. 123-127. ISBN 978-3-642-28967-5
[Book Section] , (2012)

Abstract

A comparative analysis of linear and nonlinear aerodynamic sound generation in two dimensional (2D) plane inviscid unbounded shear flow with uniform density, pressure and constant shear of velocity is presented. Self-consistent treatment of a linear aerodynamic sound generation and its interpretation are given in terms of modes with linear coupling induced by the non-normality of the flow. Perturbations of potential vorticity is identified as the only source of acoustic waves in the flow within the linear regime. Numerical simulation of a dynamics of the testing turbulent/stochastic perturbation embedded in the flow is presented. It was found that the linear aerodynamic sound dominates (up to large amplitudes of the turbulent perturbations) over the nonlinear one both at moderate and high shear rates.

Item Type: Book Section
Erschienen: 2012
Creators: Khujadze, George and Chagelishvili, George D. and Oberlack, Martin and Tevzadze, A. and Bodo, G.
Title: Aerodynamic sound generation by turbulence in shear flows
Language: English
Abstract:

A comparative analysis of linear and nonlinear aerodynamic sound generation in two dimensional (2D) plane inviscid unbounded shear flow with uniform density, pressure and constant shear of velocity is presented. Self-consistent treatment of a linear aerodynamic sound generation and its interpretation are given in terms of modes with linear coupling induced by the non-normality of the flow. Perturbations of potential vorticity is identified as the only source of acoustic waves in the flow within the linear regime. Numerical simulation of a dynamics of the testing turbulent/stochastic perturbation embedded in the flow is presented. It was found that the linear aerodynamic sound dominates (up to large amplitudes of the turbulent perturbations) over the nonlinear one both at moderate and high shear rates.

Title of Book: Progress in Turbulence and Wind Energy
Series Name: Springer Proceedings in physics
Volume: 4
Number: 141
Place of Publication: Heidelberg, Berlin
Publisher: Springer-Verlag
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
Date Deposited: 24 Aug 2011 18:21
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