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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Wall-bounded flows
TL;DR: In this article, the authors provide a brief overview of concepts and considerations specific to wall-bounded turbulent flows, and the measurement of the wall shear stress for ca nonical boundary layer, pipe and channel flows.
Proceedings ArticleDOI
The biorthogonal eigenfunction system of linear stability equations: A survey of applications to receptivity problems and to analysis of experimental and computational results
TL;DR: The concept of a biorthogonal eigenfunction system (BES) of linear stability equations has been utilized for receptivity problems in boundary layers, wall jets, pipe ow, and detonations.
Proceedings ArticleDOI
Receptivity: The Inspiration of Mark Morkovin (Invited)
Helen L. Reed,William S. Saric +1 more
TL;DR: A review of the current findings in receptivity for subsonic/transonic flows, including a discussion of the origin of the concept via Mark Morkovin, a remarkable aeronautical engineer, educator, and colleague, is provided in this article.
Journal ArticleDOI
Biorthogonal Eigenfunction System in the Triple-Deck Limit
TL;DR: In this paper, the biorthogonal eigenfunction expansion technique was applied to the triple-deck scaling problem for a periodic-in-time actuator placed on the wall in a two-dimensional boundary layer.
Journal ArticleDOI
Tracking disturbances in transitional and turbulent flows: Coherent structures
TL;DR: In this article, the transition from zero pressure gradient boundary layer to turbulent flow is studied by solving the three-dimensional Navier-Stokes equation in derived variable formulation, with vorticity as one of the dependent variables.
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.