Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Theoretical and numerical studies of sound propagation in low-Mach-number duct 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
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 [en]
Aeroacoustics, Acoustic wave absorption, Acoustic wave propagation, Boundary layer turbulence, DNS
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-168031ISBN: 978-91-7595-621-3 (print)OAI: oai:DiVA.org:kth-168031DiVA: diva2:814017
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
List of papers
1. The attenuation of sound by turbulence in internal flows
Open this publication in new window or tab >>The attenuation of sound by turbulence in internal flows
2013 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 133, no 6, 3764-3776 p.Article in journal (Refereed) Published
Abstract [en]

The attenuation of sound waves due to interaction with low Mach number turbulent boundary layers in internal flows (channel or pipe flow) is examined. Dynamic equations for the turbulent Reynolds stress on the sound wave are derived, and the analytical solution to the equation provides a frequency dependent eddy viscosity model. This model is used to predict the attenuation of sound propagating in fully developed turbulent pipe flow. The predictions are shown to compare well with the experimental data. The proposed dynamic equation shows that the turbulence behaves like a viscoelastic fluid in the interaction process, and that the ratio of turbulent relaxation time near the wall and the sound wave period is the parameter that controls the characteristics of the attenuation induced by the turbulent flow.

Place, publisher, year, edition, pages
USA: Acoustical Society of America (ASA), 2013
Keyword
acoustic wave absorption, acoustic wave propagation, boundary layer turbulence, channel flow, Mach number, non-Newtonian fluids, pipe flow, viscosity
National Category
Fluid Mechanics and Acoustics
Research subject
Järnvägsgruppen - Ljud och vibrationer
Identifiers
urn:nbn:se:kth:diva-123752 (URN)10.1121/1.4802894 (DOI)000320173600020 ()2-s2.0-84878911063 (Scopus ID)
Funder
Swedish Research Council, SDA 26211
Note

QC 20130927

Available from: 2013-06-17 Created: 2013-06-17 Last updated: 2017-12-06Bibliographically approved
2. Sound-turbulence interaction in low Mach number duct flow
Open this publication in new window or tab >>Sound-turbulence interaction in low Mach number duct flow
2013 (English)In: 19th AIAA/CEAS Aeroacoustics Conference, American Institute of Aeronautics and Astronautics, 2013Conference paper, Published paper (Other academic)
Abstract [en]

When sound waves propagate in ducts with the presence of turbulent flow, turbulent stresses can cause extra attenuation of the wave in addition to that caused by viscothermal effects. Different models for the turbulent stress acting on the sound waves are investigated in this study, and they are applied to compute the wall shear stress impedance of sound waves. Among these models the non-equilibrium model proposed by the present authors in another paper is studied in details. Attempt of including mean flow convection effect in the non-equilibrium model is made. The resulting modified model is then applied to compute the wave attenuation, and the results are compared with experimental data. 

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2013
National Category
Fluid Mechanics and Acoustics
Research subject
Järnvägsgruppen - Ljud och vibrationer
Identifiers
urn:nbn:se:kth:diva-123753 (URN)10.2514/6.2013-2024 (DOI)2-s2.0-84883690901 (Scopus ID)978-162410213-4 (ISBN)
Conference
19th AIAA/CEAS Aeroacoustics Conference; Berlin; Germany; 27 May 2013 through 29 May 2013
Funder
Swedish Research Council, SDA 26211
Note

QC 20130710

Available from: 2013-06-17 Created: 2013-06-17 Last updated: 2015-05-26Bibliographically approved
3. On the calculation of the complex wavenumber of plane waves in rigid-walled low-Mach-number turbulent pipe flows
Open this publication in new window or tab >>On the calculation of the complex wavenumber of plane waves in rigid-walled low-Mach-number turbulent pipe flows
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.

National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-168029 (URN)10.1016/j.jsv.2015.06.013 (DOI)000357744500009 ()2-s2.0-84932088999 (Scopus ID)
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
4. Numerical and theoretical investigation of pulsatile turbulent channel flows
Open this publication in new window or tab >>Numerical and theoretical investigation of pulsatile turbulent channel flows
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The turbulent channel flow subjected to imposed harmonic oscillations is studied by theo- retical models and direct numerical simulations (DNS). A linear model proposed earlier by the present authors for the coherent perturbation Reynolds shear stress is reviewed and discussed in depth. The model includes the non-equilibrium effects during the response of the Reynolds stress to the imposed periodic shear straining, where a phase lag exists between the stress and the strain. To validate the model, the DNS results are compared with the perturbation velocity and Reynolds shear stress computed from the model. The performance of the model is good in the frequency range where quasi-static assumptions are invalid, and the viscoelastic characteris- tics of the turbulent eddies implied by the model is supported by the DNS. Attempts to improve the model are also made by incorporating in the model the DNS data. In addition, the onset of the nonlinear effects during the production of the perturbation Reynolds stresses are discussed based on the DNS data, new physical features observed from the DNS are reported. 

National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-168030 (URN)
Funder
Swedish Research Council, SDA 26211
Note

QS 2015

Available from: 2015-05-25 Created: 2015-05-25 Last updated: 2015-05-26Bibliographically approved
5. Numerical study of the Stokes layer in oscillating channel flow
Open this publication in new window or tab >>Numerical study of the Stokes layer in oscillating channel flow
Show others...
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Oscillating turbulent channel flows present particular physics that proves to be particularly difficult to understand. In this paper, a case where the amplitude of the oscillations at the center of the channel is approximately 15% of the mean velocity and the dimensionless angular forcing frequency is 0.01 was studied using several numerical methods. DNS was performed to serve as reference to which the results from an LES were compared. The LES data was post-processed using both phase averaging and the more recent dynamic mode decomposition (DMD), which extracts coherent structures based on their frequency. It was found that the DMD is not able to extract faint harmonic components of the oscillations, which have been observed with phase averaging and Fourier transforms. It is, however, able to extract accurate profiles of the mean and forcing frequency quantities. Compared to the DNS, the accuracy of the LES results was similar to analytical models, although no single model gives accurate result for every quantity investigated.  

Keyword
pulsating channel flow, LES, DNS, DMD
National Category
Mechanical Engineering
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-161407 (URN)
Note

QC 20170117

Available from: 2015-03-11 Created: 2015-03-11 Last updated: 2017-01-17Bibliographically approved

Open Access in DiVA

Thesis(1933 kB)265 downloads
File information
File name FULLTEXT01.pdfFile size 1933 kBChecksum SHA-512
2082128fddbc22945e52c3d06d247fcabfcaeb9a7e87977d4e688d4a65e518b4003a663d877c79bd82e926b8fc2e6fd9903e43faebec249c3029d88a38004d9d
Type fulltextMimetype application/pdf

Authority records BETA

Weng, Chenyang

Search in DiVA

By author/editor
Weng, Chenyang
By organisation
Marcus Wallenberg Laboratory MWLLinné Flow Center, FLOW
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
Total: 265 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 1193 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf