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 measurement of free-stream turbulence in the convective boundary layer
Michael Greiner,W. Würz +1 more
TL;DR: In this paper , the free-stream turbulence in laminar flow airfoils was investigated using a constant temperature anemometer x-wire probe during cross-country flights in Central Europe and provided 22 hours of flight data, covering thermalling phases and straight flight legs.
Book ChapterDOI
The role of external disturbances inlaminar-turbulent transition
Xuesong Wu,Xuesong Wu +1 more
TL;DR: In this paper, a self-consistent theory for the vortical receptivity was proposed, which predicts accurately the experimental measurements, and the demonstration that the streaks formed due to the free stream Vortical fluctuations modify the viscous Tollmien-Schlichting (T-S) waves, and indeed may even induce stronger intermittent inviscid instability.
Dissertation
Simulation and control of stationary crossflow vortices
TL;DR: In this paper, an unsteady Navier-Stokes/Large Eddy Simulation (UNS/LES) approach is used to simulate the transition from laminar-to-turbulent transition.
Proceedings ArticleDOI
A High-Order Finite-Difference Method for Linear Stability Analysis and Bi-orthogonal Decomposition of Hypersonic Boundary Layer Flow
Zihao Zou,Xiaolin Zhong +1 more
TL;DR: In this paper , a very high-order finite difference method for obtaining the discrete and continuous modes eigenfunctions based on a non-uniform grid method proposed by Zhong and Tatineni was introduced.
Journal ArticleDOI
Observations of Offshore Internal Boundary Layers
TL;DR: In this article , the growth of the marine internal boundary layer (MIBL, height hi) with the shore-normal distance x, is a topic of continuing interest because of its applications in coastal pollution dispersion, offshore wind farm siting, coastal air-sea fluxes and in evaporative ducting.
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.