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
Controlled stationary/travelling cross-flow mode interaction in a Mach 6.0 boundary layer
TL;DR: In this article, passive discrete roughness was applied near the cone tip, just upstream of Branch-I of the linear stability neutral curve for stationary cross-flow modes, and the passive roughness consisted of indentations (dimples) that were evenly spaced azimuthally to excite a specific wavenumber.
Journal ArticleDOI
Flat plate boundary layer transition induced by a controlled near-wall circular cylinder wake
Guo-Sheng He,Jinjun Wang +1 more
TL;DR: In this article, the flat plate boundary layer transition induced by the wake of a circular cylinder close to the wall is investigated using particle image velocimetry (PIV) and hydrogen bubble visualization techniques.
Proceedings ArticleDOI
Aerodynamic Optimization of the Flat Plate Leading Edge for Experimental Studies of Laminar and Transitional Boundary Layers
TL;DR: In this article, the effect of important geometrical features of the leading edge on the resulting pressure distribution, starting from the well-known symmetric modified super ellipse, was investigated.
Proceedings ArticleDOI
Free-Flight Investigation of Transition under Turbulent Conditions on a Laminar Wing Glove
Proceedings ArticleDOI
A High-Order Cut-Cell Method for Numerical Simulation of Hypersonic Boundary Layer with Surface Roughness
TL;DR: In this article, a new Hi-order cut-cell method is developed to generate cut cells in the irregular domain, and the governing Navier-Stokes equations are solved by using third-order non-uniform upwind finite difference method in irregular cells, and a high-order shock fitting method is also employed to treat the upper bow-shock to maintain the overall accuracy.
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.