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Direct numerical simulation of sound generation in turbulent shear flows

Colonius, Tim (1999) Direct numerical simulation of sound generation in turbulent shear flows. In: 137th Meeting of the Acoustical Society of America, 15-19 March 1999, Berlin, Germany.

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Direct numerical simulations of turbulent shear flows and their radiated acoustic fields have provided new insights into the mechanisms of sound generation, as well as the efficacy and limitations of the acoustic analogy approach. At present, these computations are expensive, and limited to relatively low Reynolds number and canonical flows. The computational approach consists of using high‐order accurate numerical methods, together with accurate and robust nonreflecting and buffer‐zone boundary conditions. This talk will focus on the results of computations of sound generated in mixing layers, jets, and open cavity flows. The relationship between linear stability waves in the flow and the radiated acoustic field is examined, in the context of a forced subsonic mixing layer and a fully turbulent supersonic round jet. For the subsonic flow, the acoustic sources can be modeled as wave packets, which radiate a superdirective acoustic field. For the supersonic jet, the directly computed (i.e., nonlinear source) acoustic field is compared to predictions based on radiating stability waves. Finally, the flow/acoustic instabilities in the subsonic flow over an open cavity are examined, and control strategies for reducing the internal acoustic load are explored.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Program
Colonius, Tim0000-0003-0326-3909
Additional Information:© 1999 Acoustical Society of America. Published Online: 25 January 1999. Work supported by NSF (CTS‐9501349) and AFOSR (F49620‐98‐1‐0095).
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620‐98‐1‐0095
Subject Keywords:Fluid flows; Linear stability analysis; Supersonics; Computational fluid dynamics; Acoustic phenomena; Supersonic jets; Acoustic field; Acoustic analogies; Subsonic flows; Sound generation
Record Number:CaltechAUTHORS:20190726-104730754
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97465
Deposited By: Melissa Ray
Deposited On:01 Aug 2019 18:15
Last Modified:16 Nov 2021 17:31

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