Skip to main content
×
Home
    • Aa
    • Aa
  • Get access
    Check if you have access via personal or institutional login
  • Cited by 294
  • Cited by
    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

    Bellan, Josette 2016. Large-Eddy Simulation of Supersonic Round Jets: Effects of Reynolds and Mach Numbers. AIAA Journal, Vol. 54, Issue. 5, p. 1482.


    Bogey, Christophe and Marsden, Olivier 2016. 54th AIAA Aerospace Sciences Meeting.

    Bogey, Christophe and Marsden, Olivier 2016. Simulations of Initially Highly Disturbed Jets with Experiment-Like Exit Boundary Layers. AIAA Journal, Vol. 54, Issue. 4, p. 1299.


    Cetin, Mehmet Onur Pauz, Vitali Meinke, Matthias and Schröder, Wolfgang 2016. Computational analysis of nozzle geometry variations for subsonic turbulent jets. Computers & Fluids, Vol. 136, p. 467.


    Cetin, Mehmet Onur Meinke, Matthias and Schröder, Wolfgang 2016. Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015).


    Fiévet, Romain Tinney, Charles E. Baars, Woutijn J. and Hamilton, Mark F. 2016. Coalescence in the Sound Field of a Laboratory-Scale Supersonic Jet. AIAA Journal, Vol. 54, Issue. 1, p. 254.


    Fu, Zhidong Agarwal, Anurag Cavalieri, André V. Jordan, Peter Lehnasch, Guillaume and Daviller, Guillaume 2016. 22nd AIAA/CEAS Aeroacoustics Conference.

    Fu, Zhidong Agarwal, Anurag Cavalieri, André V. Jordan, Peter and Brès, Guillaume A. 2016. 22nd AIAA/CEAS Aeroacoustics Conference.

    Gonzalez, David R. Gaitonde, Datta V. and Lewis, Mark J. 2016. 46th AIAA Fluid Dynamics Conference.

    Gonzalez, David R. Speth, Rachelle Gaitonde, Datta V. and Lewis, Mark J. 2016. 54th AIAA Aerospace Sciences Meeting.

    Jeun, Jinah Nichols, Joseph W. and Jovanović, Mihailo R. 2016. Input-output analysis of high-speed axisymmetric isothermal jet noise. Physics of Fluids, Vol. 28, Issue. 4, p. 047101.


    Mullyadzhanov, R. Abdurakipov, S. and Hanjalić, K. 2016. Helical Structures in the Near Field of a Turbulent Pipe Jet. Flow, Turbulence and Combustion,


    Sasidharan Nair, Unnikrishnan and Gaitonde, Datta V. 2016. 22nd AIAA/CEAS Aeroacoustics Conference.

    Sassanis, Vasileios Sescu, Adrian Collins, Eric Harris, Robert E. and Luke, Edward A. 2016. 54th AIAA Aerospace Sciences Meeting.

    Sengupta, Soumyo Agostini, Lionel M. Sasidharan Nair, Unnikrishnan and Gaitonde, Datta V. 2016. 54th AIAA Aerospace Sciences Meeting.

    Unnikrishnan, S. and Gaitonde, Datta V. 2016. A high-fidelity method to analyze perturbation evolution in turbulent flows. Journal of Computational Physics, Vol. 310, p. 45.


    Wan, Zhen-Hua Yang, Hai-Hua Zhang, Xing-Chen and Sun, De-Jun 2016. Instability waves and aerodynamic noise in a subsonic transitional turbulent jet. European Journal of Mechanics - B/Fluids, Vol. 57, p. 192.


    Zhang, Man and Frendi, Kader 2016. 22nd AIAA/CEAS Aeroacoustics Conference.

    2016. Acoustics, Aeroacoustics and Vibrations.


    Bogey, Christophe and Marsden, Olivier 2015. 53rd AIAA Aerospace Sciences Meeting.

    ×
  • Journal of Fluid Mechanics, Volume 438
  • July 2001, pp. 277-305

Noise sources in a low-Reynolds-number turbulent jet at Mach 0.9

  • JONATHAN B. FREUND (a1)
  • DOI: http://dx.doi.org/10.1017/S0022112001004414
  • Published online: 01 July 2001
Abstract

The mechanisms of sound generation in a Mach 0.9, Reynolds number 3600 turbulent jet are investigated by direct numerical simulation. Details of the numerical method are briefly outlined and results are validated against an experiment at the same flow conditions (Stromberg, McLaughlin & Troutt 1980). Lighthill's theory is used to define a nominal acoustic source in the jet, and a numerical solution of Lighthill's equation is compared to the simulation to verify the computational procedures. The acoustic source is Fourier transformed in the axial coordinate and time and then filtered in order to identify and separate components capable of radiating to the far field. This procedure indicates that the peak radiating component of the source is coincident with neither the peak of the full unfiltered source nor that of the turbulent kinetic energy. The phase velocities of significant components range from approximately 5% to 50% of the ambient sound speed which calls into question the commonly made assumption that the noise sources convect at a single velocity. Space–time correlations demonstrate that the sources are not acoustically compact in the streamwise direction and that the portion of the source that radiates at angles greater than 45° is stationary. Filtering non-radiating wavenumber components of the source at single frequencies reveals that a simple modulated wave forms for the source, as might be predicted by linear stability analysis. At small angles from the jet axis the noise from these modes is highly directional, better described by an exponential than a standard Doppler factor.

Copyright
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×
MathJax