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Simulations of acoustic scattering in duct systems with flow
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0003-4103-0129
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Aeroacoustics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-9061-4174
2010 (English)In: 20th International Congress on Acoustics 2010, ICA 2010 - Incorporating Proceedings of the 2010 Annual Conference of the Australian Acoustical Society, 2010, 186-191 p.Conference paper, Published paper (Refereed)
Abstract [en]

We present an efficient methodology to perform calculations of acoustic propagation and scattering by geometrical objects in ducts with flows. In this paper a methodology with a linearized Navier-Stokes equations solver in frequency domain is evaluated on a two-dimensional geometry of an in-duct area expansion. The Navier-Stokes equations are linearized around a time- independent mean flow that is obtained from an incompressible Reynolds Averaged Navier-Stokes solver which uses a k-ε turbulence model. A plane wave decomposition method based on acoustic pressure and velocity is used to extract the up- and downstream propagating waves. The scattering of the acoustic waves by the induct area expansion is calculated and compared to experiments. Frequencies in the plane wave range up to the cut-on frequency of the first higher order propagating acoustical mode are considered. The acoustical properties of the area expansion is presented in a scattering matrix form that can be used in acoustical two-port calculations on complex duct systems such as exhaust system mufflers and ventilation systems.

Place, publisher, year, edition, pages
2010. 186-191 p.
Keyword [en]
A-plane, Acoustic pressures, Acoustic propagation, Acoustic Scattering, Acoustical properties, Duct systems, Frequency domains, Geometrical objects, Linearized navier-stokes equations, Mean flow, Plane wave, Reynolds-Averaged Navier-Stokes, Scattering matrices, Two-dimensional geometry, Ventilation systems
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-77833Scopus ID: 2-s2.0-84869113057ISBN: 978-161782745-7 (print)OAI: oai:DiVA.org:kth-77833DiVA: diva2:492119
Conference
20th International Congress on Acoustics 2010, ICA 2010 - Incorporating the 2010 Annual Conference of the Australian Acoustical Society; Sydney, NSW; Australia; 23 August 2010 through 27 August 2010
Note

QC 20120210

Available from: 2012-02-07 Created: 2012-02-07 Last updated: 2014-08-15Bibliographically approved

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Boij, SusannEfraimsson, Gunilla

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Marcus Wallenberg Laboratory MWLAeroacousticsLinné Flow Center, FLOW
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