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
In-Flight Investigation of Transition Under Turbulent Conditions on a Laminar Wing Glove
TL;DR: In this paper, a laminar wing glove equipped with pressure transducers and wall microphones was used to detect transition and investigate the boundary-layer instabilities in a motorized glider.
Journal ArticleDOI
On the disturbance evolution downstream of a cylindrical roughness element
TL;DR: In this article, the disturbance evolution downstream of a cylindrical roughness element placed in a laminar boundary layer in an airfoil leading edge region, is investigated.
Journal ArticleDOI
Experiments on localized secondary instability in bypass boundary layer transition
G. Balamurugan,A. C. Mandal +1 more
TL;DR: In this article, an experimental study on localized secondary instability of unsteady streamwise streaks in bypass boundary layer transition under an elevated level of free-stream turbulence has been carried out mainly using the particle image velocimetry (PIV) technique.
Journal ArticleDOI
Excitation of unsteady Görtler vortices by localized surface nonuniformities
TL;DR: In this article, a combined theoretical and numerical analysis of an experiment devoted to the excitation of Gortler vortices by localized stationary or vibrating surface nonuniformities in a boundary layer over a concave surface is performed.
Proceedings ArticleDOI
Leading-Edge Roughness Effects on 63(3)-418 Airfoil Performance
Edward B. White,Douglas Kutz,Justin Freels,Jason Monschke,Ronald Grife,Yuping Sun,David Chao +6 more
TL;DR: In this article, the leading edge roughness of a 2m-chord wind turbine blade was investigated on a twodimensional 633-418 model with a deliberately roughened leading edge.
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.