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POD Analysis of Sound Generation by a Turbulent Jet

Colonius, T. and Freund, J. B. (2002) POD Analysis of Sound Generation by a Turbulent Jet. In: 40th AIAA Aerospace Sciences Meeting & Exhibit, 14-17 January 2002, Reno, NV.

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A Proper Orthogonal Decomposition (POD) is constructed for a Mach 0.9 turbulent jet using a well-validated direct numerical simulation database. Norms are defined based on near-field volume integrals of pressure, turbulence kinetic energy, streamwise velocity, and total enthalpy, two-dimensional integrals of streamswise velocity (to match experimental measurements), and far-field integrals of pressure over a sphere. We find substantially different POD modes for the different norms, and their efficiency at representing the full data is strongly dependent upon the norm and specifically which data we attempt to represent. To reproduce near-field turbulence statistics requires relatively few modes computed by a kinetic energy or pressure norm. However, a large number of the POD modes computed using a near-field norm are required to represent the sound field. The dominant near-field POD modes computed with either the near-field pressure norm or the sound field norm have the structure of wave packets.

Item Type:Conference or Workshop Item (Paper)
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Colonius, T.0000-0003-0326-3909
Additional Information:© 2002 by J. B. Freund. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. Published Online: 22 Aug 2012. JBF gratefully acknowledges the support of NASA. Both authors acknowledge fruitful interactions with Dr. Peter Blossey whose initial computations of pressure POD modes from this database inspired the present effort.
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AIAA Paper2002-0072
Record Number:CaltechAUTHORS:20190709-092059690
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96959
Deposited By: Melissa Ray
Deposited On:10 Jul 2019 20:54
Last Modified:16 Nov 2021 17:25

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