Ran, Hongyu and Colonius, Tim (2009) Numerical simulation of the sound radiated by a turbulent vortex ring. International Journal of Aeroacoustics, 8 (4). pp. 317-336. ISSN 1475-472X http://resolver.caltech.edu/CaltechAUTHORS:20100819-150529622
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The acoustic field radiated by a turbulent vortex ring is studied. Direct Numerical Simulations (ONS) 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 modes of oscillation and their turbulent breakdown are investigated. The peak frequency agrees well with experiments. and the modal directivities agree well with predictions of vortex sound theory. Based on the self-similar decay of the turbulent near field, the self-similar 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.
|Additional Information:||© 2009 Multi-Science Publishing. Received 12 July 2008. Revised 12 October 2008. Accepted 12 October 2008. This research was supported in part by the National Science Foundation (Grant CTS-9501349). The work was presented in preliminary form in AIAA Paper 2004-2918.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||19 Aug 2010 22:10|
|Last Modified:||26 Dec 2012 12:20|
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