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Scattering matrix evaluation with CFD in low Mach number flow ducts
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-4103-0129
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-9061-4174
2009 (English)In: Proceedings of the SAE 2009 Noise and Vibration Conference, 2009Conference paper, Published paper (Other academic)
Abstract [en]

We present an efficient methodology to perform calculations of acoustic propagation and scattering by components 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 and adaptive mesh refinement. A plane wave decomposition method based on acoustic pressure and velocity is used to extract the up and downstream propagating waves. The reflection of the acoustic waves by the induct area expansion is calculated and compared to both measurements and analytical models. Frequencies in the plane wave range up to the cut-on frequency of the first higher order propagating acoustical mode are considered. The reflection 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
2009.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-65760DOI: 10.4271/2009-01-2040Scopus ID: 2-s2.0-84877503756OAI: oai:DiVA.org:kth-65760DiVA: diva2:483655
Conference
SAE 2009 Noise and Vibration Conference and Exhibition. St. Charles, IL, USA. May 19-21 2009
Note
QC 20120507Available from: 2012-01-25 Created: 2012-01-25 Last updated: 2012-05-07Bibliographically approved

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Boij, SusannEfraimsson, Gunilla

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Kierkegaard, AxelBoij, SusannEfraimsson, Gunilla
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Aeronautical and Vehicle EngineeringLinné Flow Center, FLOWMarcus Wallenberg Laboratory MWLVinnExcellence Center for ECO2 Vehicle design
Fluid Mechanics and Acoustics

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