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Type: Artigo de periódico
Title: Fast acoustic scattering predictions with non-uniform potential flow effects
Author: Wolf, WR
Lele, SK
Abstract: Acoustic scattering simulations with non-uniform potential flow effects are performed by two formulations described in the literature, valid under specific flow conditions. Both formulations require the solution of the Helmholtz equation for the acoustic scattering computation and the solution of the Laplace equation for the steady potential base flow. These equations are solved using the boundary element method (BEM), and the fast multipole method (FMM) is used to accelerate the matrix-vector products arising from the Helmholtz and Laplace BEM equations. An assessment of the solutions obtained by the two formulations is presented for a verification test case where analytical and full unsteady Euler solutions are available. Results of acoustic scattering for large-scale simulations of realistic airframe configurations are presented. Good agreement is found between Taylor's low Mach number scattering formulation and the solution of the full unsteady Euler equations for high-frequency simulations of plane waves scattering from a rigid cylinder. The computational cost per iteration of the FMM-BEM for the acoustic scattering around a full airplane configuration discretized by 550,000 boundary elements in a non-uniform potential flow is 19 s.
Subject: Acoustic scattering
Non-uniform flow
Fast multipole method
Country: Brasil
Editor: Abcm Brazilian Soc Mechanical Sciences & Engineering
Citation: Journal Of The Brazilian Society Of Mechanical Sciences And Engineering. Abcm Brazilian Soc Mechanical Sciences & Engineering, v. 35, n. 4, n. 407, n. 418, 2013.
Rights: aberto
Identifier DOI: 10.1007/s40430-013-0038-6
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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