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- W1968016957 abstract "The three-dimensional boundary layer produced by a disk rotating in otherwise still fluid is analytically investigated and its stability properties are systematically established. Using a local parallel flow approximation, finite-amplitude primary travelling vortices governed by a nonlinear dispersion relation are obtained. A secondary stability analysis yields the secondary linear dispersion relation and the secondary absolute growth rate, which determines the long-term stability of the primary nonlinear vortex-trains. By using these local characteristics, spatially developing global patterns of crossflow vortices are derived by employing asymptotic techniques. This approach accounts for both the self-sustained behaviour, exhibiting a sharp transition from laminar to turbulent flow, and the spatial response to external harmonic forcing, for which onset of nonlinearity and transition both depend on the forcing parameters. Based on these results, an open-loop control method is described in detail. Its aim is not to suppress the primary fluctuations but rather to enhance them and to tune them to externally imposed frequency and modenumber, and thereby to delay onset of secondary absolute instability and transition. It is shown that transition can be delayed by more than 100 boundary-layer units." @default.
- W1968016957 created "2016-06-24" @default.
- W1968016957 creator A5039594516 @default.
- W1968016957 date "2007-01-11" @default.
- W1968016957 modified "2023-10-18" @default.
- W1968016957 title "Primary crossflow vortices, secondary absolute instabilities and their control in the rotating-disk boundary layer" @default.
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- W1968016957 doi "https://doi.org/10.1007/s10665-006-9095-5" @default.
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