This article is a perspective review of boundary layer transition. Both orderly and bypass
transition are discussed, but with a decided emphasis on bypass routes. The focus is on …

The linear response to stochastic and optimal harmonic forcing of small coherent
perturbations to the turbulent channel mean flow is computed for Reynolds numbers ranging …

Reducing skin friction is important in nature and in many technological applications. This
reduction may be achieved by reducing stresses in turbulent boundary layers, for instance …

An experimental and theoretical investigation aimed at describing the nonmodal growth of
steady and spanwise periodic streamwise streaks in a flat plate boundary layer is presented …

It has recently been found by using temporal and spatial numerical simulations that steady
optimal streaks of moderate amplitude, ie, sufficiently large but not exceeding the critical …

The linear global instability and resulting transition to turbulence induced by an isolated
cylindrical roughness element of height) roughness element sustaining only the sinuous …

THE study of laminar-to-turbulent transition on surfaces with significant roughness levels has
had a long history motivated by the need to understand transition on realistic surfaces …

The secondary instability of a zero-pressure-gradient boundary layer, distorted by unsteady
Klebanoff streaks, is investigated. The base profiles for the analysis are computed using …

Classical vortex generators, known for their efficiency in delaying or even inhibiting
boundary layer separation, are here shown to be coveted devices for transition to turbulence …

The interactions between a solid surface and a fluid flow underlie dynamical processes
relevant to air, sea, and land vehicle performance and numerous other technologies. Key …