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
Modal analysis of roughness-induced crossflow vortices in a Falkner-Skan-Cooke boundary layer
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Stabilitet, Transition, Kontroll.ORCID-id: 0000-0001-9446-7477
KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Skolan för teknikvetenskap (SCI), Mekanik, Stabilitet, Transition, Kontroll. KTH, Skolan för teknikvetenskap (SCI), Mekanik, Processteknisk strömningsmekanik. KTH, Centra, SeRC - Swedish e-Science Research Centre.ORCID-id: 0000-0001-9627-5903
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW. KTH, Centra, SeRC - Swedish e-Science Research Centre.ORCID-id: 0000-0002-5913-5431
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Stabilitet, Transition, Kontroll. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.ORCID-id: 0000-0001-7864-3071
2013 (Engelska)Ingår i: International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, TSFP-8 , 2013Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
TSFP-8 , 2013.
Nyckelord [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
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-222982Scopus ID: 2-s2.0-85034229223ISBN: 9780000000002 OAI: oai:DiVA.org:kth-222982DiVA, id: diva2:1193246
Konferens
8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, 28 August 2013 through 30 August 2013
Anmärkning

QC 20180326

Tillgänglig från: 2018-03-26 Skapad: 2018-03-26 Senast uppdaterad: 2018-03-26Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Scopus

Personposter BETA

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

Sök vidare i DiVA

Av författaren/redaktören
Brynjell-Rahkola, MattiasSchlatter, PhilippHanifi, ArdeshirHenningson, Dan S.
Av organisationen
Stabilitet, Transition, KontrollLinné Flow Center, FLOWProcessteknisk strömningsmekanikSeRC - Swedish e-Science Research CentreMekanik
Strömningsmekanik och akustik

Sök vidare utanför DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetricpoäng

isbn
urn-nbn
Totalt: 57 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