Journal ArticleDOI
Boundary-layer receptivity to freestream disturbances
TLDR
The boundary-layer receptivity to external acoustic and vortical disturbances is reviewed in this article. But, the authors do not consider the effects of external acoustic or vortic disturbances on the boundary layer.Abstract:
The current understanding of boundary-layer receptivity to external acoustic and vortical disturbances is reviewed. Recent advances in theoretical modeling, numerical simulations, and experiments are discussed. It is shown that aspects of the theory have been validated and that the mechanisms by which freestream disturbances provide the initial conditions for unstable waves are better understood. Challenges remain, however, particularly with respect to freestream turbulenceread more
Citations
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Journal ArticleDOI
Stability and transition of three-dimensional boundary layers
TL;DR: The recent progress in three-dimensional boundary-layer stability and transition is reviewed in this paper, focusing on the crossflow instability that leads to transition on swept wings and rotating disks.
Journal ArticleDOI
Transition in boundary layers subject to free-stream turbulence
TL;DR: In this article, the effect of high levels of free-stream turbulence on the transition in a Blasius boundary layer is studied by means of direct numerical simulations, where a synthetic turbulent inflow is obtained as superposition of modes of the continuous spectrum of the Orr-Sommerfeld and Squire operators.
Journal ArticleDOI
Direct Numerical Simulation on the Receptivity, Instability, and Transition of Hypersonic Boundary Layers
Xiaolin Zhong,Xiaowen Wang +1 more
TL;DR: In the 20 years since the review by Kleiser & Zang (1991) on the direct numerical simulation (DNS) of the boundary-layer transition, significant progress has been made on DNS in the hypersonic flow regime and in the spatial DNS approach as discussed by the authors.
Journal ArticleDOI
Receptivity of a supersonic boundary layer over a flat plate. Part 1. Wave structures and interactions
Yanbao Ma,Xiaolin Zhong +1 more
TL;DR: In this paper, the authors studied the mechanisms of the receptivity to disturbances of a Mach 4.5 flow over a flat plate by using both direct numerical simulations (DNS) and linear stability theory (LST).
Journal ArticleDOI
Transition in Wall-Bounded Flows
Cunbiao Lee,J. Z. Wu +1 more
TL;DR: In this paper, the authors present direct comparisons of experimental results on transition in wall-bounded flows obtained by flow visualizations, hot-film measurement, and particle-image velocimetry, along with a brief mention of relevant theoretical progresses, based on a critical review of about 120 selected publications.
References
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Journal ArticleDOI
A finite Reynolds number approach for the prediction of boundary layer receptivity in localized regions
TL;DR: In this paper, the classical Orr-Sommerfeld theory is used to predict the receptivity due to small-amplitude surface nonuniformities, which can also be extended easily to problems involving other types of instabilities.
Proceedings ArticleDOI
Boundary layer receptivity to freestream turbulence
TL;DR: In this paper, weak freestream turbulence induced Tollmien-Schichting (TS) wave packets in a Blasius boundary-layer, and packets gained strength during propagation through expansion of lateral and longitudinal scales, and through an increase in peak amplitude.
Journal ArticleDOI
Localized receptivity of boundary layers
TL;DR: In this paper, the boundary-layer receptivity resulting from acoustic forcing over a flat plate with a localized surface irregularity is analyzed using perturbation methods, and the length-scale reduction, essential to acoustic receptivity, is captured within the framework of the classical stability theory.
Book ChapterDOI
Effect of leading-edge geometry on boundary-layer receptivity to freestream sound
TL;DR: In this paper, a semi-infinite flat plate with an elliptic leading edge is simulated numerically and the incompressible flow past the flat plate is computed by solving the full Navier-Stokes equations in general curvilinear coordinates.