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Investigation of the roughness-induced transition: global stability analyses and direct numerical simulations
Abstract The linear global instability and resulting transition to turbulence induced by an isolated cylindrical roughness element of height $h$ and diameter $d$ immersed within an incompressible
The minimal seed of turbulent transition in the boundary layer
Abstract This paper describes a scenario of transition from laminar to turbulent flow in a spatially developing boundary layer over a flat plate. The base flow is the Blasius non-parallel flow
Spatially convective global modes in a boundary layer
The linear stability of a weakly nonparallel flow, the case of a flat plate boundary layer, is revisited by a linear global stability approach where the two spatial directions are taken as
Model reduction for fluids using frequential snapshots
It is shown that this method is efficient to perform POD and balanced proper orthogonal decomposition reduced-order models in both globally stable and unstable flows through two numerical examples: the flow over a backward-faci...
Intermittency and transition to chaos in the cubical lid-driven cavity flow
Transition from steady state to intermittent chaos in the cubical lid-driven flow is investigated numerically. Fully three-dimensional stability analyses have revealed that the flow experiences an
On the dynamics of axisymmetric turbulent separating/reattaching flows
The present work focuses on the intrinsic properties of an axisymmetric separating/reattaching flow. A numerical simulation of a compressible flow over a cylinder extended by another cylinder of
Large-Eddy Simulation of Broadband Unsteadiness in a Shock/Boundary-Layer Interaction
The simulation of low-frequency unsteadiness in shock wave/turbulent boundary-layer interactions constitutes a challenging case insofar as very long time integrations are required to describe these
Sensitivity and optimal forcing response in separated boundary layer flows
The optimal asymptotic response to time harmonic forcing of a convectively unstable two-dimensional separated boundary layer on a flat plate is numerically revisited from a global point of view. By
Optimal wave packets in a boundary layer and initial phases of a turbulent spot
The three-dimensional global optimal dynamics of a flat-plate boundary layer is studied by means of an adjoint-based optimization in a spatial domain of long – but finite – streamwise dimension. The