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Evaluation of Noise Radiation Mechanisms in Turbulent Jets

Colonius, T. and Mohseni, K. and Freund, J. B. and Lele, S. K. and Moin, P. (1998) Evaluation of Noise Radiation Mechanisms in Turbulent Jets. In: Proceedings of the 1998 Summer Program. Center for Turbulence Research , Stanford, CA, pp. 159-167.

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Data from the direct numerical simulation (DNS) of a turbulent, compressible (Mach = 1.92) jet has been analyzed to investigate the process of sound generation. The overall goals are to understand how the different scales of turbulence contribute to the acoustic field, and to understand the role that linear instability waves play in the noise produced by supersonic turbulent jets. Lighthill’s acoustic analogy was used to predict the radiate sound from turbulent source terms computed from the DNS data. Preliminary computations (for the axisymmetric mode of the acoustic field) showgood agreement between the acoustic field determined from DNS and acoustic analogy. Further work is needed to refine the calculations and investigate the source terms. Work was also begun to test the validity of linear stability wave models of sound generation in supersonic jets. An adjoint-based method was developed to project the DNS data onto the most unstable linear stability mode at different streamwise positions. This will allow the evolution of the wave and its radiated acoustic field, determined by solving the linear equations, to be compared directly with the evolution of the near and far-field fluctuations in the DNS.

Item Type:Book Section
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URLURL TypeDescription ItemWorkshop Program
Colonius, T.0000-0003-0326-3909
Mohseni, K.0000-0002-1382-221X
Moin, P.0000-0002-0491-7065
Additional Information:© 1998 Stanford University Center for Turbulence Research.
Record Number:CaltechAUTHORS:20190726-104729942
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97455
Deposited By: Melissa Ray
Deposited On:01 Aug 2019 20:03
Last Modified:20 Mar 2021 00:32

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