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Computational aeroacoustics: progress on nonlinear problems of sound generation

Colonius, Tim and Lele, Sanjiva K. (2004) Computational aeroacoustics: progress on nonlinear problems of sound generation. Progress in Aerospace Sciences, 40 (6). pp. 345-416. ISSN 0376-0421. doi:10.1016/j.paerosci.2004.09.001.

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Computational approaches are being developed to study a range of problems in aeroacoustics. These aeroacoustic problems may be classified based on the physical processes responsible for the sound radiation, and range from linear problems of radiation, refraction, and scattering in known base flows or by solid bodies, to sound generation by turbulence. In this article, we focus mainly on the challenges and successes associated with numerically simulating sound generation by turbulent flows. We discuss a hierarchy of computational approaches that range from semi-empirical schemes that estimate the noise sources using mean-flow and turbulence statistics, to high-fidelity unsteady flow simulations that resolve the sound generation process by direct application of the fundamental conservation principles. We stress that high-fidelity methods such as Direct Numerical Simulation (DNS) and Large Eddy Simulation (LES) have their merits in helping to unravel the flow physics and the mechanisms of sound generation. They also provide rich databases for modeling activities that will ultimately be needed to improve existing predictive capabilities. Spatial and temporal discretization schemes that are well-suited for aeroacoustic calculations are analyzed, including the effects of artificial dispersion and dissipation on uniform and nonuniform grids. We stress the importance of the resolving power of the discretization as well as computational efficiency of the overall scheme. Boundary conditions to treat the flow of disturbances in and out of the computational domain, as well as methods to mimic anechoic domain extension are discussed. Test cases on some benchmark problems are included to provide a realistic assessment of several boundary condition treatments. Finally, highlights of recent progress are given using selected model problems. These include subsonic cavity noise and jet noise. In the end, the current challenges in aeroacoustic modeling and in simulation algorithms are revisited with a look toward the future developments.

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Colonius, Tim0000-0003-0326-3909
Additional Information:© 2004 Elsevier Ltd. Available online 24 November 2004. We wish to thank the Editor for his kind invitation to write this article. We are deeply indebted to our colleagues, collaborators, and former students for their contributions and permission to reproduce results. In particular we thank M. Barone, D. Bodony, S. Collis, J. Eldredge, J. Freund, C. Lui, T. Manning, A. Marsden, B. Mitchell, K. Mohseni, S. Nagarajan, H. Ran, C. Rowley, T. Suzuki, and M. Wang. We also thank J. Freund and M. Goldstein for their insightful remarks and criticisms on a draft of this paper. SKL gratefully acknowledges support from AARC/OAI and Boeing, and TC gratefully acknowledges support from AFOSR, NSF, and AARC/OAI.
Funding AgencyGrant Number
Ohio Aerospace InstituteUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Issue or Number:6
Record Number:CaltechAUTHORS:20190214-075725469
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Official Citation:Tim Colonius, Sanjiva K. Lele, Computational aeroacoustics: progress on nonlinear problems of sound generation, Progress in Aerospace Sciences, Volume 40, Issue 6, 2004, Pages 345-416, ISSN 0376-0421, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92917
Deposited By: Tony Diaz
Deposited On:14 Feb 2019 17:52
Last Modified:16 Nov 2021 16:54

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