Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
On the relevance of Reynolds stresses in resolvent analyses of turbulent wall-bounded flows
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
Univ Paris Saclay, LIMSI, UPR 3251 CNRS, F-91400 Orsay, France..
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0001-7864-3071
Cent Nantes, LHEEA, UMR 6598, CNRS, F-44300 Nantes, France..
2019 (Engelska)Ingår i: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 867, s. 969-984, artikel-id PII S0022112019001964Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The ability of linear stochastic response analysis to estimate coherent motions is investigated in turbulent channel flow at the friction Reynolds number Re-r = 1007. The analysis is performed for spatial scales characteristic of buffer-layer and large-scale motions by separating the contributions of different temporal frequencies. Good agreement between the measured spatio-temporal power spectral densities and those estimated by means of the resolvent is found when the effect of turbulent Reynolds stresses, modelled with an eddy-viscosity associate with the turbulent mean flow, is included in the resolvent operator. The agreement is further improved when the flat forcing power spectrum (white noise) is replaced with a power spectrum matching the measures. Such a good agreement is not observed when the eddy-viscosity terms are not included in the resolvent operator. In this case, the estimation based on the resolvent is unable to select the right peak frequency and wall-normal location of buffer-layer motions. Similar results are found when comparing truncated expansions of measured streamwise velocity power spectral densities based on a spectral proper orthogonal decomposition to those obtained with optimal resolvent modes.

Ort, förlag, år, upplaga, sidor
CAMBRIDGE UNIV PRESS , 2019. Vol. 867, s. 969-984, artikel-id PII S0022112019001964
Nyckelord [en]
turbulent boundary layers
Nationell ämneskategori
Maskinteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-249766DOI: 10.1017/jfm.2019.196ISI: 000463073000001Scopus ID: 2-s2.0-85063881975OAI: oai:DiVA.org:kth-249766DiVA, id: diva2:1307660
Anmärkning

QC 20190429

Tillgänglig från: 2019-04-29 Skapad: 2019-04-29 Senast uppdaterad: 2019-04-29Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Personposter BETA

Henningson, Dan S.

Sök vidare i DiVA

Av författaren/redaktören
Morra, PierluigiHenningson, Dan S.
Av organisationen
Linné Flow Center, FLOW
I samma tidskrift
Journal of Fluid Mechanics
Maskinteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 21 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf