Abstract
A comparative investigation of shear-layer instability mechanisms in wall-bounded o ws is performed by employing both spatial and temporal direct numerical simulations. In this study, two complex o ws are considered, the transitional backward-facing step o w and the turbulent wall-jet over plane and curved surfaces (Coanda o w). For the temporal simulations, (mean) proles that are obtained from the spatial simulations are used as base o ws. Temporal simulations neglect any spatial evolution of both the base o w and the disturbances and can therefore be used to investigate the local stability behavior. First the primary Kelvin{Helmholtz type instability of the shear layer is addressed. For secondary instabilities (subharmonic and fundamental), the investigation aims to determine the dominant instability mechanisms responsible for the occurrence of the typical o w structures that are observed in the spatial simulations. The complimentary nature of the temporal simulations provides crucial information for the interpretation of the spatial simulation results.
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