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Méthode hybride pour le calcul du rayonnement acoustique d'écoulements anisothermes à faibles nombres de Mach

Abstract : This study proposes a hybrid aeroacoustic approach for the calculation of the noise radiated by non isothermal turbulent subsonic flows. The aerodynamic part is obtained using a direct numerical simulation of the Navier-Stokes equations in a Low Mach number approximation. This formulation makes it possible to be released from the effects of compressibility - numerically penalizing - while preserving the influence of the phenomena relating to thermal dilation on the flow. The acoustic propagation is calculated by the resolution of the linearized Euler's equations. The rigorous definition of the acoustic sources constitutes the link between these two stages. The specific sources from the non isothermal flows, compatible with those already known for the isothermal flows, are obtained. This approach is initially validated for isothermal and non isothermal mixing layers by comparison with direct calculations. Other validations are carried out for a spatial isothermal mixing layer and confronted with results of the literature. The contribution to the radiated noise of the estimated source terms, is examined for a non isothermal spatial mixing layer. The evolution of acoustic radiation according to the ratio of temperatures is studied for a temporal mixing layer. The numerical resolutions are based on a spatial discretization by high order finite difference schemes (compact schemes) and Runge-Kutta schemes for the temporal integrations. These high order schemes, and the accurate boundary conditions respect the numerical requirements specific to the computational aeroacoustics.
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Contributor : François Golanski <>
Submitted on : Saturday, February 26, 2005 - 4:31:25 PM
Last modification on : Tuesday, March 19, 2019 - 1:14:15 AM
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  • HAL Id : tel-00008585, version 1


François Golanski. Méthode hybride pour le calcul du rayonnement acoustique d'écoulements anisothermes à faibles nombres de Mach. Mécanique []. Université de Poitiers, 2004. Français. ⟨tel-00008585⟩



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