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Global Stability Analysis of a Roughness Wake in a Falkner-Skan-Cooke Boundary Layer

Authors :
Brynjell-Rahkola, Mattias
Schlatter, Philipp
Hanifi, Ardeshir
Henningson, Dan Stefan
Brynjell-Rahkola, Mattias
Schlatter, Philipp
Hanifi, Ardeshir
Henningson, Dan Stefan
Publication Year :
2015

Abstract

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.<br />QC 20151127

Details

Database :
OAIster
Notes :
English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1234261686
Document Type :
Electronic Resource
Full Text :
https://doi.org/10.1016.j.piutam.2015.03.040