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Influence of the Shape on the Roughness-Induced Transition

Ouvrage scientifique
Author
CHERUBINI, Stefania
19097 Dipartimento di Ingegneria Meccanica e Gestionale [DIMEG]
LERICHE, Emmanuel
1252 Laboratoire de Mécanique de Lille - FRE 3723 [LML]
ccROBINET, Jean-Christophe
134975 Laboratoire de Dynamique des Fluides [DynFluid]
492366 Airbus Safran Launchers
ccLOISEAU, Jean-Christophe

URI
http://hdl.handle.net/10985/17803
DOI
10.1007/978-3-319-06260-0_18
Date
2015

Abstract

lobal instability analysis of the three-dimensional flow past two rough- ness elements of different shape, namely a cylinder and a bump, is presented. In both cases, the eigenspectrum is made of modes characterised by a varicose symmetry and localised mostly in the zones of large base flow shear. The primary instabil- ity exhibited is the same in both cases and consists in an isolated unstable mode closely related to streaks local instability. For the cylinder however, a whole branch of modes is in addition destabilised as the Reynolds number is further increased.

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