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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Dissertation
Experimental study of natural and forced instabilities and transition of a rotating-disk boundary-layer flow
TL;DR: In this paper, the authors studied the instability and transition of the rotating-disk boundary-layer flow and found that the flow becomes transitional at R ≈ 530 and fully turbulent by R = 600, and the profiles in the fully turbulent region follow the log law of turbulent boundary layers.
Proceedings ArticleDOI
Three-dimensionality in shock/boundary layer interactions: A numerical and experimental investigation
Journal ArticleDOI
DNS study on the development of boundary layer with heat transfer under the effects of external and internal disturbances
Shuang Xia,Yasumasa Ito,Kouji Nagata,Yasuhiko Sakai,Hiroki Suzuki,Osamu Terashima,Toshiyuki Hayase +6 more
TL;DR: In this article, the effects of external and internal disturbances on the development of boundary layer with heat transfer are investigated by means of direct numerical simulation (DNS) based on the finite difference scheme.
Journal ArticleDOI
Effects of streamwise-elongated and spanwise-periodic surface roughness elements on boundary-layer instability
Csaba B. Kátai,Xuesong Wu +1 more
TL;DR: In this article, the impact on the boundary-layer stability of spanwise-periodic, streamwise-elongated surface roughness elements is investigated, where the roughness height is chosen such that the wall shear is altered by.
Journal ArticleDOI
Active Noise Control in a Closed-Circuit Wind Tunnel
TL;DR: Active noise control is implemented in a closed-circuit wind tunnel to eliminate upstream-traveling reflections in experiments on boundary-layer receptivity to freestream sound.
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.