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Comparison of outflow boundary conditions for subsonic aeroacoustic simulations

Fosso Pouangue, Arnaud and Deniau, Hugues and Lamarque, Nicolas and Poinsot, Thierry Comparison of outflow boundary conditions for subsonic aeroacoustic simulations. (2011) International Journal for Numerical Methods in Fluids, 68 (10). 1207-1233. ISSN 0271-2091

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Official URL: http://dx.doi.org/10.1002/fld.2597

Abstract

Aeroacoustics simulations require much more precise boundary conditions than classical aerodynamics. Two classes of non-reflecting boundary conditions for aeroacoustics are compared in the present work: characteristic analysis based methods and Tam and Dong approach. In characteristic methods, waves are identified and manipulated at the boundaries while Tam and Dong use modified linearized Euler equations in a buffer zone near outlets to mimic a non-reflecting boundary. The principles of both approaches are recalled and recent characteristic methods incorporating the treatment of transverse terms are discussed. Three characteristic techniques (the original NSCBC formulation of Poinsot and Lele and two versions of the modified method of Yoo and Im) are compared to the Tam and Dong method for four typical aeroacoustics problems: vortex convection on a uniform flow, vortex convection on a shear flow, acoustic propagation from a monopole and from a dipole. Results demonstrate that the Tam and Dong method generally provides the best results and is a serious alternative solution to characteristic methods even though its implementation might require more care than usual NSCBC approaches.

Item Type:Article
Additional Information:Thanks to John Wiley & Sons editor. The definitive version is available at http://dx.doi.org/10.1002/fld.2597
HAL Id:hal-00811985
Audience (journal):International peer-reviewed journal
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Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
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Deposited On:11 Apr 2013 12:43

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