A coarse grid extraction of sound signals for computational aeroacoustics

Sound waves are propagating pressure fluctuations, which are typically several orders of magnitude smaller than the pressure variations in the flow field that account for flow acceleration. On the other hand, these fluctuations travel at the speed of sound in the medium, not as a transported fluid q...

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Bibliographic Details
Published in:International journal for numerical methods in fluids 2002-12, Vol.40 (12), p.1515-1525
Main Authors: Djambazov, G. S., Lai, C.-H., Pericleous, K. A., Wang, Z.-K.
Format: Article
Language:English
Subjects:
Acoustics
Aeroacoustics and atmospheric sound
Aeroacoustics, atmospheric sound
computational aeroacoustics
Computational techniques
defect correction methods
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Mathematical methods in physics
multi-scale
Physics
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Summary:Sound waves are propagating pressure fluctuations, which are typically several orders of magnitude smaller than the pressure variations in the flow field that account for flow acceleration. On the other hand, these fluctuations travel at the speed of sound in the medium, not as a transported fluid quantity. Due to the above two properties, the Reynolds averaged Navier1pt–1ptStokes equations do not resolve the acoustic fluctuations. This paper discusses a defect correction method for this type of multi‐scale problems in aeroacoustics. Numerical examples in one dimensional and two dimensional are used to illustrate the concept. Copyright © 2002 John Wiley & Sons, Ltd.
ISSN:0271-2091
1097-0363
DOI:10.1002/fld.408