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
Modal analysis of roughness-induced crossflow vortices in a Falkner-Skan-Cooke boundary layer
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.ORCID iD: 0000-0001-9446-7477
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-5913-5431
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7864-3071
2013 (English)In: International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, TSFP-8 , 2013Conference paper, Published paper (Refereed)
Abstract [en]

A three-dimensional global stability analysis using high-order direct numerical simulations is performed to investigate the effect of surface roughness with Reynolds number (based on roughness height) Rek above and below the critical value for transition, on the eigenmodes of a Falkner-Skan-Cooke boundary layer. The surface roughness is introduced with the immersed boundary method and the eigenvalues and eigenfunctions are solved using an iterative time-stepper method. The study reveals a global instability for the case with higher Reynolds number that causes the flow in the non-linear simulations to break down to turbulence shortly downstream of the roughness. Examination of the unstable linear global modes show that these are the same modes that are observed in experiments immediately before breakdown due to secondary instability, which emphasizes the importance of these modes in transition.

Place, publisher, year, edition, pages
TSFP-8 , 2013.
Keyword [en]
Atmospheric thermodynamics, Boundary layers, Computational fluid dynamics, Eigenvalues and eigenfunctions, Iterative methods, Modal analysis, Reynolds equation, Reynolds number, Surface roughness, Turbulence, Turbulent flow, Vortex flow, Crossflow vortices, Falkner-Skan-Cooke boundary layers, Global instability, Global stability analysis, Immersed boundary methods, Nonlinear simulations, Roughness height, Secondary instability, Shear flow
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-222982Scopus ID: 2-s2.0-85034229223ISBN: 9780000000002 OAI: oai:DiVA.org:kth-222982DiVA, id: diva2:1193246
Conference
8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, 28 August 2013 through 30 August 2013
Note

QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-03-26Bibliographically approved

Open Access in DiVA

No full text in DiVA

Scopus

Authority records BETA

Brynjell-Rahkola, MattiasSchlatter, PhilippHanifi, ArdeshirHenningson, Dan S.

Search in DiVA

By author/editor
Brynjell-Rahkola, MattiasSchlatter, PhilippHanifi, ArdeshirHenningson, Dan S.
By organisation
Stability, Transition and ControlLinné Flow Center, FLOWFluid Mechanics of Industrial ProcessesSeRC - Swedish e-Science Research CentreMechanics
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 3 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