A frequency domain linearized Navier―Stokes equations approach to acoustic propagation in flow ducts with sharp edges

Acoustic wave propagation in flow ducts is commonly modeled with time-domain non-linear Navier-Stokes equation methodologies. To reduce computational effort, investigations of a linearized approach in frequency domain are carried out. Calculations of sound wave propagation in a straight duct are pre...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2010-02, Vol.127 (2), p.710-719
Main Authors: KIERKEGAARD, Axel, BOIJ, Susann, EFRAIMSSON, Gunilla
Format: Article
Language:English
Subjects:
4-pole
acoustic wave propagation
Acoustics
aeroacoustics
bias flow
Exact sciences and technology
expansions
finite-element method
Fluid dynamics
Fundamental areas of phenomenology (including applications)
General theory
low-mach-number
Maskinteknik
matrix
Mechanical engineering
Navier-Stokes equations
orifice
orifices (mechanical)
Other technology
parameters
Physics
pipe flow
scattering
slit
sound-absorption
TECHNOLOGY
TEKNIKVETENSKAP
Övriga teknikvetenskaper
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Summary:Acoustic wave propagation in flow ducts is commonly modeled with time-domain non-linear Navier-Stokes equation methodologies. To reduce computational effort, investigations of a linearized approach in frequency domain are carried out. Calculations of sound wave propagation in a straight duct are presented with an orifice plate and a mean flow present. Results of transmission and reflections at the orifice are presented on a two-port scattering matrix form and are compared to measurements with good agreement. The wave propagation is modeled with a frequency domain linearized Navier-Stokes equation methodology. This methodology is found to be efficient for cases where the acoustic field does not alter the mean flow field, i.e., when whistling does not occur.
ISSN:0001-4966
1520-8524
1520-8524
DOI:10.1121/1.3273899