Oblique transition in hypersonic double-wedge flow

نویسندگان

چکیده

We utilize resolvent and weakly nonlinear analyses in combination with direct numerical simulations (DNS) to identify mechanisms for oblique transition a Mach 5 hypersonic flow over an adiabatic slender double-wedge. Even though the laminar separated is globally stable, analysis demonstrates significant amplification of unsteady external disturbances linearized equations. These are introduced upstream separation zone they lead appearance waves further downstream. demonstrate that large arises from growth fluctuation shear stress due streamline curvature base layer. This contrast attached boundary layers, where no such mechanism exists. also use show operator associated linearization around governs evolution steady reattachment streaks arise quadratic interactions waves. generate vortical excitations reattaching layer which formation recirculation their subsequent amplification, breakdown, turbulence Our energy budget shows deceleration near primarily responsible streaks. Finally, we employ DNS examine latter stages predictive power input-output framework uncovering triggering high-speed flows.

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ژورنال

عنوان ژورنال: Journal of Fluid Mechanics

سال: 2022

ISSN: ['0022-1120', '1469-7645']

DOI: https://doi.org/10.1017/jfm.2022.697