Transient growth of perturbations in Stokes oscillatory flows
| Autor: | Damien Biau |
|---|---|
| Přispěvatelé: | Laboratoire de Dynamique des Fluides (DynFluid), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
7. Clean energy
01 natural sciences Instability 010305 fluids & plasmas [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Physics::Fluid Dynamics symbols.namesake Exponential growth 0103 physical sciences 010306 general physics transition to turbulence Physics Base flow Turbulence Mechanical Engineering Reynolds number Mechanics Vorticity Condensed Matter Physics Nonlinear system instability Classical mechanics Mechanics of Materials symbols boundary layer stability Mécanique: Mécanique des fluides [Sciences de l'ingénieur] Energy (signal processing) |
| Zdroj: | Journal of Fluid Mechanics Journal of Fluid Mechanics, Cambridge University Press (CUP), 2016, 794, pp.10. ⟨10.1017/jfm.2016.210⟩ |
| ISSN: | 0022-1120 1469-7645 |
| Popis: | International audience; Oscillatory Stokes flows, with zero mean, are subjected to subcritical transition to turbulence. The maximal energy growth of perturbations is computed in the subcritical regime through an optimisation method. The results show strong amplifications during half a period. The energy transfer from the base flow involves an Orr mechanism with two-dimensional vorticity waves, and the maximum energy scales exponentially with the Reynolds number. Nonlinear simulations show that low-energy perturbations are sufficient to trigger turbulent flow. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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