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Journal of the Acoustical Society of America / Volume 124 / Issue 6 / AEROACOUSTICS, ATMOSPHERIC SOUND [28]

Correction techniques for the truncation of the source field in acoustic analogies

J. Acoust. Soc. Am. Volume 124, Issue 6, pp. 3421-3429 (2008); (9 pages)

Paula Martínez-Lera and Christophe Schram

LMS International, Researchpark Z1, Interleuvenlaan 68, 3001 Leuven, Belgium

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The truncation of the source field may induce large overpredictions in the acoustic field computed through acoustic analogies. A comparative study of different correction approaches proposed in the literature is carried out, considering three different techniques: correction terms based on a convection assumption, use of model extensions, and windowing techniques. It is shown that convection-based correction terms need to take into account noncompactness effects of the source field in order to yield accurate results. A modified correction term that includes these effects is derived, and its equivalence to the method of model extensions in the case of purely convected flows is highlighted. Moreover, the performance of different windowing techniques is investigated.

© 2008 Acoustical Society of America

ACKNOWLEDGMENTS

The authors gratefully acknowledge the EC support for the present work, performed within the Marie Curie RTN project AETHER (Contract No. MRTN-CT-2006-035713).

Article Outline

  1. INTRODUCTION
  2. BACKGROUND THEORY
  3. CORRECTION TECHNIQUES FOR THE TRUNCATION OF THE DOMAIN
    1. Correction term for the truncation on a wake
    2. Derivation of a correction term considering noncompactness effects
    3. Method of model extensions
    4. Windowing techniques
  4. TEST CASE: SOUND GENERATED BY THE FLOW PAST A CYLINDER
    1. Flow computation
    2. Acoustic computation
      1. Moving framework (tensor mathij )
      2. Fixed framework (tensor mathij )
  5. CONCLUSIONS

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KEYWORDS and PACS

Keywords

acoustic wave propagation, aeroacoustics, convection

PACS

  • 43.28.Py

    Interaction of fluid motion and sound, Doppler effect, and sound in flow ducts

  • 43.20.Wd

    Analogies

  • 43.28.Ra

    Generation of sound by fluid flow, aerodynamic sound and turbulence

ARTICLE DATA

History
Received 03 Mar 2008
Accepted 23 Sep 2008
Revised 20 Sep 2008
Digital Object Identifier
http://dx.doi.org/10.1121/1.2999555

PUBLICATION DATA

ISSN

0001-4966 (print)  

Publisher

$abstract.society.value is a Member of CrossRef Acoustical Society of America

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