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
Receptivity of High-Speed Boundary Layers to Kinetic Fluctuations
Alexander Fedorov,Anatoli Tumin +1 more
TL;DR: In this article, the authors considered the response of high-speed boundary layers in calorically perfect gas to fluctuating hydrodynamics introduced by Landau and Lifshitz.
Journal ArticleDOI
Study of acoustic disturbances effect on laminar separation bubble by IR thermography
TL;DR: In this article, a thin airfoil is tested at a Reynolds number of 60,000 with and without the acoustic disturbance in the frequency range between 200 and 800 Hz with step of 100 Hz.
Journal ArticleDOI
The influence of harmonic wall motion on transitional boundary layers
M. J. Philipp Hack,Tamer A. Zaki +1 more
TL;DR: In this paper, the influence of harmonic spanwise wall motion on bypass transition in boundary layers is investigated using direct numerical simulations, and it is shown that the appropriate choice of the forcing parameters can achieve a substantial stabilization of the laminar flow regime.
Journal ArticleDOI
Tiny bubbles challenge giant turbines: Three Gorges puzzle.
TL;DR: From a multi-disciplinary analysis, this Three Gorges puzzle could reflect an unknown type of cavitation inception presumably triggered by turbulence production from the boundary-layer streak transitional process, which presents a fresh challenge not only to this old turbine industry, but also to the fundamental sciences.
Journal ArticleDOI
Boundary layer receptivity to free-stream turbulence and surface roughness over a swept flat plate
TL;DR: An experimental study of the receptivity of disturbances and their subsequent development into a three-dimensional boundary layer has been carried out in this paper, where the three dimensional boundary layer was set in a 3D space.
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.
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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.
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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.
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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.
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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.