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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Proceedings ArticleDOI
Receptivity of A Hypersonic Flat-Plate Boundary Layer to Steady Blowing-Suction
Xiaowen Wang,Xiaolin Zhong +1 more
TL;DR: In this article, the receptivity of the same hypersonic flat-plate boundary layer to steady three-dimensional blowing-suction is studied by numerical simulations, and the results show that counter rotating streamwise vortices are induced by steady blowing suction.
Journal ArticleDOI
Experiments in bypass boundary layer transition under a stream with and without shear
G. Balamurugan,Alakesh C. Mandal +1 more
Journal ArticleDOI
Roughness Effect on Hypersonic Second Mode Instability and Transition on a Cone
TL;DR: In this article , the authors investigated the ability of finite roughness strips to attenuate the second mode instability on a Mach 8 straight blunt cone with a freestream unit Reynolds number of 9,585,000.
Dissertation
Stability of compressible boundary layers with a velocity overshoot
TL;DR: In this article, the inviscid stability of boundary layers with overshoot was investigated and a new mode of instability was discovered, in addition to the classical first and higher-mode solutions.
Proceedings ArticleDOI
Disturbances Generated by Random and Periodic Surface Roughness: Experiments and Models
TL;DR: Experiments and simulations that consider how three-dimensional surface roughness affects laminar-to-turbulent transition have a history of mixed success as mentioned in this paper, and an extension to random, distributed roughness that takes advantage of manufactured surfaces is described and implemented.
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.