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Global Stability Analysis of a Roughness Wake 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), Mekanik.ORCID-id: 0000-0001-9627-5903
KTH, Skolan för teknikvetenskap (SCI), Mekanik.ORCID-id: 0000-0002-5913-5431
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Stabilitet, Transition, Kontroll.ORCID-id: 0000-0001-7864-3071
2015 (engelsk)Inngår i: Procedia IUTAM, Elsevier, 2015, s. 192-200Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

A global stability analysis of a Falkner-Skan-Cooke boundary layer with distributed three-dimensional surface roughness is per- formed using high-order direct numerical simulations. Computations have been performed for different sizes of the roughness elements, and a time-stepping method has been used to find the instability modes. The study shows that a critical roughness height beyond which a global instability is excited does exist. Furthermore, the origins of this instability is examined by means of an energy analysis, which reveals the production and dissipation terms responsible for the instability, as well as the region in space where the instability originates.

sted, utgiver, år, opplag, sider
Elsevier, 2015. s. 192-200
Emneord [en]
energy analysis, Falkner-Skan-Cooke (FSC), global instability, surface roughness, Atmospheric thermodynamics, Boundary layers, Energy management, Stability, Falkner-Skan, Falkner-Skan-Cooke boundary layers, Global stability analysis, Roughness elements, Three-dimensional surface, Time stepping method
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-176117DOI: 10.1016/j.piutam.2015.03.040ISI: 000380499200023Scopus ID: 2-s2.0-84940645851OAI: oai:DiVA.org:kth-176117DiVA, id: diva2:874718
Konferanse
8th IUTAM-ABCM Symposium on Laminar Turbulent Transition, LTT 2014, 8 September - 12 September 2014
Merknad

QC 20151127

Tilgjengelig fra: 2015-11-27 Laget: 2015-11-02 Sist oppdatert: 2016-08-30bibliografisk kontrollert

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Brynjell-Rahkola, MattiasSchlatter, PhilippHanifi, ArdeshirHenningson, Dan Stefan

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