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On the calculation of the complex wavenumber of plane waves in rigid-walled low-Mach-number turbulent pipe flows
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0002-7203-0503
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0003-4103-0129
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. Swedish Defence Research Agency, FOI, Stockholm, Sweden.ORCID iD: 0000-0002-5913-5431
2015 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 354, 132-153 p.Article in journal (Refereed) Published
Abstract [en]

A numerical method for calculating the wavenumbers of axisymmetric plane waves in rigid walled low-Mach-number turbulent flows is proposed, which is based on solving the linearized Navier-Stokes equations with an eddy viscosity model. In addition, theoretical models for the wavenurnbers are reviewed, and the main effects (the viscothermal effects, the mean flow convection and refraction effects, the turbulent absorption, and the moderate compressibility effects) which may influence the sound propagation are discussed. Compared to the theoretical models, the proposed numerical method has the advantage of potentially including more effects in the computed wavenurnbers.

The numerical results of the vvavenumbers are compared with the reviewed theoretical models, as well as experimental data from the literature. It shows that the proposed numerical method can give satisfactory prediction of both the real part (phase shift) and the imaginary part (attenuation) of the measured wavenumbers, especially when the refraction effects or the turbulent absorption effects become important.

Place, publisher, year, edition, pages
2015. Vol. 354, 132-153 p.
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-168029DOI: 10.1016/j.jsv.2015.06.013ISI: 000357744500009Scopus ID: 2-s2.0-84932088999OAI: oai:DiVA.org:kth-168029DiVA: diva2:814007
Funder
Swedish Research Council, SDA 26211
Note

QC 20150826. Updated from Manuscript to Article in journal.

Available from: 2015-05-25 Created: 2015-05-25 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Theoretical and numerical studies of sound propagation in low-Mach-number duct flows
Open this publication in new window or tab >>Theoretical and numerical studies of sound propagation in low-Mach-number duct flows
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

When sound waves propagate in a duct in the presence of turbulent flow, turbulent mixing can cause attenuation of the sound waves extra to that caused by the viscothermal effects. Experiments show that compared to the viscothermal effects, this turbulent absorption becomes the dominant contribution to the sound attenuation at sufficiently low frequencies. The mechanism of this turbulent absorption is attributed to the turbulent stress and the turbulent heat transfer acting on the coherent perturbations (including the sound waves) near the duct wall, i.e. sound-turbulence interaction.

The purpose of the current investigation is to understand the mechanism of the sound-turbulence interaction in low-Mach-number internal flows by theoretical modeling and numerical simulations. The turbulence absorption can be modeled through perturbation turbulent Reynolds stresses and perturbation turbulent heat flux in the linearized perturbation equations. In this thesis, the linearized perturbation equations are reviewed, and different models for the turbulent absorption of the sound waves are investigated. A new non–equilibrium model for the perturbation turbulent Reynolds stress is also proposed. The proposed model is validated by comparing with experimental data from the literature, and with the data from Direct Numerical Simulations (DNS) of pulsating turbulent channel flow. Good agreement is observed. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. viii, 82 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2015:30
Keyword
Aeroacoustics, Acoustic wave absorption, Acoustic wave propagation, Boundary layer turbulence, DNS
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-168031 (URN)978-91-7595-621-3 (ISBN)
Public defence
2015-06-15, D2, Lindstedtsvägen 5, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council
Note

QC 20150526

Available from: 2015-05-26 Created: 2015-05-25 Last updated: 2015-05-26Bibliographically approved

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Weng, ChenyangBoij, SusannHanifi, Ardeshir

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