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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 turbulence

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Citations
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Journal ArticleDOI

Boundary-layer Flows Past an Hemispherical Roughness Element: DNS, Global Stability and Sensitivity Analysis

TL;DR: In this paper, the authors investigate the full three-dimensional instability mechanism arising in the wake of an hemispherical roughness element immersed in a laminar Blasius boundary layer.
Proceedings ArticleDOI

Receptivity of A Hypersonic Flat-Plate Boundary Layer to Surface Roughness

TL;DR: In this article, the receptivity of a hypersonic flat-plate boundary layer to small surface roughness is investigated by series of numerical simulations, and the effect of spanwise wave number on receptivity is studied by considering six cases of receptivity simulations.
Journal ArticleDOI

Experimental investigation of an aeroacoustic feedback mechanism on a two-dimensional side mirror model

TL;DR: In this article, the authors investigated the tonal self-noise emission of a two-dimensional blunt-body side mirror model in order to characterize the underlying source mechanism and confirmed the existence of an aero-acoustic feedback loop.

On stability and receptivity of boundary-layer flows

TL;DR: In this paper, stability and receptivity analysis as well as studies on control of the laminar-turbulent transition in boundary-layer flows through direct numerical simulations are presented.
References
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Book

Stability and Transition in Shear Flows

TL;DR: In this article, the authors present an approach to the Viscous Initial Value Problem with the objective of finding the optimal growth rate and the optimal response to the initial value problem.
Journal ArticleDOI

A note on an algebraic instability of inviscid parallel shear flows

TL;DR: In this paper, it was shown that all parallel inviscid shear flows of constant density are unstable to a wide class of initial infinitesimal three-dimensional disturbances in the sense that, according to linear theory, the kinetic energy of the disturbance will grow at least as fast as linearly in time.
Journal ArticleDOI

Parabolized stability equations

TL;DR: Parabolized stability equations (PSE) have been used for aerodynamic design of laminar flow control systems as discussed by the authors, and they can be obtained at modest computational expense.
Journal ArticleDOI

Optimal disturbances and bypass transition in boundary layers

TL;DR: In this article, the authors used the steady boundary-layer approximation to calculate the upstream disturbances experiencing maximum spatial energy growth, which are numerically calculated using techniques commonly employed when solving optimal-control problems for distributed parameter systems.
Journal ArticleDOI

Reynolds number independent instability of the boundary layer over a flat surface : optimal perturbations

TL;DR: In this article, the dependence on initial conditions of the three-dimensional algebraic spatial instability of the Blasius boundary layer is examined by a recently developed method of receptivity analysis based on the upstream integration of adjoint equations.