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Identifications of sources of sound in low Mach number flows by the use of flow field eigenmodes
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
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
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.
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2006 (English)In: 13th International Congress on Sound and Vibration 2006, 2006, 2967-2974 p.Conference paper, Published paper (Refereed)
Abstract [en]

We present a method to study sound generation processes in low Mach Number flows. Instead of the full flow field obtained from e.g a DNS, we consider a base flow together with a time-dependent perturbation ,where the perturbation satisfy the Navier-Stokes equations linearized around the base-flow. In a reduced model the perturbation is approximated by a linear combination of the cigenmodes of a corresponding eigenvalue problem. The behavior in time is determined by the corresponding eigenvalues. Curie's equation is used to calculate the acoustic field. By studying the source terms in Curie's equation, it is possible to identify mechanisms for sources of sound. This makes it possible to study how the different sources of sound depend on different structures of the flow field. We apply the methodology on a two- dimensional flow over a cavity with smoothed corners. Results of acoustic pressure in the far field and source strengths for different superpositions of eigenmodes are presented.

Place, publisher, year, edition, pages
2006. 2967-2974 p.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-87914Scopus ID: 2-s2.0-84883411932ISBN: 978-162748150-2 (print)OAI: oai:DiVA.org:kth-87914DiVA: diva2:502030
Conference
The Thirteenth International Congress on Sound and Vibration (ICSV 13), Vienna, Austria
Note

QC 20120229

Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2016-12-08Bibliographically approved

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Efraimsson, GunillaHenningson, DanÅbom, Mats

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Kierkegaard, AxelEfraimsson, GunillaHeopffner, JeromeÅkervik, EspenHenningson, DanÅbom, Mats
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MWL Flow acousticsLinné Flow Center, FLOWAeronautical and Vehicle EngineeringMechanics
Fluid Mechanics and Acoustics

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