An acoustic analogy applied to the laminar upstream flow over an open 2D cavity

Jonas Ask; Lars Davidson

doi:10.1016/j.crme.2005.07.005

An acoustic analogy applied to the laminar upstream flow over an open 2D cavity

Jonas Ask ¹ ; Lars Davidson ²

¹ Volvo Car Corporation, Fluid Dynamic Center, 405 31 Göteborg, Sweden
² Division of Thermo and Fluid Dynamics, Chalmers, University of Technology, 412 96 Göteborg, Sweden

Comptes Rendus. Mécanique, Computational AeroAcoustics: from acoustic sources modeling to farfield radiated noise prediction, Volume 333 (2005) no. 9, pp. 660-665.

Abstract
Résumé

In this work a modified version of the Lighthill–Curle's analogy is applied to study the near field acoustics of an upstream laminar flow past an open cavity. Three incompressible cases have been computed and are compared against the corresponding compressible results. The three incompressible cases are carried out with different time-step sizes, distances from the cavity trailing edge to the outlet and spatial resolution in the streamwise direction. The aim of the work is to study the differences in compressible and incompressible sources in Lighthill–Curle's equation and their influence on the sound radiated.

Dans cette étude une version modifiée de l'analogie de Lighthill–Curle est utilisée pour l'étude de l'acoustique en amont d'un écoulement laminaire passant une cavité. Trois cas incompressibles sont réalisés et comparés avec leurs homologues compressibles. Les trois cas incompressibles comprennent différents pas temporels, distances séparant le bord amount du bord aval et différentes résolutions spatiales dans la direction de l'écoulement. Le but de l'étude est l'analyse des différences entre les sources compressibles et incompressibles dans l'équation de Lighthill–Curle et leur influence sur le son propagé.

Published online: 2005-09-01

DOI: 10.1016/j.crme.2005.07.005

Keywords: Acoustics, Curle, Cavity, Incompressible CFD
Mots-clés : Acoustique, Curle, Cavité, Incompressible CFD

Author's affiliations:

Jonas Ask ¹; Lars Davidson ²

¹ Volvo Car Corporation, Fluid Dynamic Center, 405 31 Göteborg, Sweden
² Division of Thermo and Fluid Dynamics, Chalmers, University of Technology, 412 96 Göteborg, Sweden

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     title = {An acoustic analogy applied to the laminar upstream flow over an open {2D} cavity},
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Jonas Ask; Lars Davidson. An acoustic analogy applied to the laminar upstream flow over an open 2D cavity. Comptes Rendus. Mécanique, Computational AeroAcoustics: from acoustic sources modeling to farfield radiated noise prediction, Volume 333 (2005) no. 9, pp. 660-665. doi : 10.1016/j.crme.2005.07.005. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2005.07.005/

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