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Numerical Simulation of Sound Radiated from a Turbulent Vortex Ring

Ran, Hongyu and Colonius, Tim (2004) Numerical Simulation of Sound Radiated from a Turbulent Vortex Ring. In: 10th AIAA/CEAS Aeroacoustics Conference, 10-12 May 2004, Manchester, United Kingdom.

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The acoustic field radiated by a turbulent vortex ring is studied. Direct Numerical Simulations (DNS) of the fully compressible, three-dimensional Navier-Stokes equations are used to generate an axisymmetric vortex ring to which 3D stochastic disturbances are added. The disturbances cause instability and turbulent transition of the vortex ring. Detailed information about temporal evolution of sound pressure level, spectrum and directivity associated with each mode is investigated. The peak frequency agrees well with experiments, and the directivity of each azimuthal mode agrees well with predictions of vortex sound theory. Based on the self-similar decay of the turbulent near field, the selfsimilar decay of the sound field is investigated. We also explore the connections with jet noise by modeling the jet as a de-correlated train of vortex rings.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription Paper Paper
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2004 by Hongyu Ran and Tim Colonius. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 11 Nov 2012. This research was supported in part by the National Science Foundation (Grant CTS-9501349).
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Subject Keywords:Aeroacoustics
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Other Numbering System NameOther Numbering System ID
AIAA Paper2004-2918
Record Number:CaltechAUTHORS:20190718-165128101
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97276
Deposited By: Melissa Ray
Deposited On:26 Jul 2019 18:18
Last Modified:16 Nov 2021 17:30

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