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- W4367319663 abstract "In this paper, the possibility of absolute instability in a plane unidirectional jet is analysed. We consider a parametrized family of velocity profiles with variable inflection point location and shear layer thickness. Using the inviscid saddle-point analysis, we show that absolute instability can occur in the case of a sufficiently low velocity at the inflection point or a sufficiently thin shear layer. Then we proceed to the viscous analysis and find the critical Reynolds numbers separating the zones of convective and absolute instability. We obtained a minimum value $Re = 315$ . As an independent verification of the theoretical results, we conduct a direct numerical simulation of the evolution of a localized pulse perturbation in the framework of the linearized Navier–Stokes equations. The calculated absolute/convective instability boundary is in a good agreement with theoretical results of the saddle-point analysis." @default.
- W4367319663 created "2023-04-29" @default.
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- W4367319663 date "2023-04-28" @default.
- W4367319663 modified "2023-09-27" @default.
- W4367319663 title "Absolute instability of plane incompressible jets" @default.
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- W4367319663 doi "https://doi.org/10.1017/jfm.2023.163" @default.
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