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
Combined free-stream disturbance measurements and receptivity studies in hypersonic wind tunnels by means of a slender wedge probe and direct numerical simulation
Alexander Wagner,Erich Schülein,René Petervari,Klaus Hannemann,Syed Raza Christopher Ali,Adriano Cerminara,Neil D. Sandham +6 more
TL;DR: In this article, the authors conducted a combined free-stream disturbance measurements and receptivity studies in hypersonic wind tunnels by means of a slender wedge probe and direct numerical simulation.
Effects of Thermochemical Nonequilibrium on Hypersonic Boundary-Layer Instability in the Presence of Surface Ablation or Isolated Two-Dimensional Roughness
TL;DR: In this article, the effects of surface ablation, or two-dimensional roughness, on hypersonic boundary-layer instability were studied using a high-order shock-fitting method.
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Response of a stratified boundary layer on a tilted wall to surface undulations
TL;DR: In this paper, the structure of a stratified boundary layer over a tilted bottom with a small streamwise undulation is studied theoretically and numerically, and the viscous solution in the critical layer, obtained and compared with direct numerical simulation results, is in good agreement for both the scaling and the spatial structure.
Journal ArticleDOI
Stochastic receptivity analysis of boundary layer flow
TL;DR: In this article, externally forced linearized Navier-Stokes equations were used to study the receptivity of pre-transitional boundary layers to persistent sources of stochastic excitation.
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Response of a hypersonic blunt cone boundary layer to slow acoustic waves with assessment of various routes of receptivity
TL;DR: In this article, the authors investigated the hypersonic boundary-layer receptivity to slow acoustic waves for the Mach 6 flow over a 5-degree half-angle blunt cone with the nose radius of 5.08 mm.
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.