The linearized perturbed compressible equations for aeroacoustic noise prediction at very low Mach numbers

J. H. Seo, Young J. Moon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The linearized perturbed compressible equations, based on a hydrodynamic/acoustic splitting method, are proposed for low Mach number aeroacoustics. In the hydrodynamic/acoustic splitting method, perturbed vorticity easily becomes unstable through coupling effects between the hydrodynamic vorticity and the perturbed velocities, and it consequently contaminates the acoustic solution. The generation of perturbed vorticity is firmly suppressed in the linearized perturbed compressible equations, which is able to secure consistent, grid-independent acoustic solution. The validity of the linearized perturbed compressible equations is demonstrated for a dipole tone from a circular cylinder at Reynolds number based on the cylinder diameter, ReD=150 and free stream Mach number M=0.1, a quadruple noise generated by Kirchhoff vortex at Mach number based on the rotating speed Mθ=0.1, and a quadruple noise from a temporal mixing layer at Reynolds number based on the shear layer thickness Re δ=10000 and Mach number based on the shear rate M s=0.1.

Original languageEnglish
Title of host publicationCollection of Technical Papers - 11th AIAA/CEAS Aeroacoustics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
Pages1593-1604
Number of pages12
ISBN (Print)1563477300, 9781563477300
DOIs
Publication statusPublished - 2005
EventCollection of Technical Papers - 11th AIAA/CEAS Aeroacoustics Conference - Monterey, CA, United States
Duration: 2005 Mar 232005 Mar 25

Publication series

NameCollection of Technical Papers - 11th AIAA/CEAS Aeroacoustics Conference
Volume3

Other

OtherCollection of Technical Papers - 11th AIAA/CEAS Aeroacoustics Conference
CountryUnited States
CityMonterey, CA
Period05/3/2305/3/25

ASJC Scopus subject areas

  • Engineering(all)

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    Seo, J. H., & Moon, Y. J. (2005). The linearized perturbed compressible equations for aeroacoustic noise prediction at very low Mach numbers. In Collection of Technical Papers - 11th AIAA/CEAS Aeroacoustics Conference (pp. 1593-1604). (Collection of Technical Papers - 11th AIAA/CEAS Aeroacoustics Conference; Vol. 3). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2005-2927