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
A High Order Cut Cell Method for Numerical Simulation of Three Dimensional Hypersonic Boundary-Layer Transition with Finite Surface Roughness
Le Duan,Xiaolin Zhong +1 more
TL;DR: The flow structure in three-dimensional boundary layer is investigated by using the new numerical approach, which extends the previous new high order cut cell method to simulate three- dimensional hypersonic flow with finite surface roughness.
Book ChapterDOI
A general framework for stability, receptivity, and optimal control
TL;DR: In this paper, a general mathematical framework is presented that applies to stability, receptivity, and control issues based on the iterative solution of state and adjoint equations until convergence to a maximum/minimum of an appropriately chosen cost functional is reached.
Journal ArticleDOI
Hypersonic boundary layer receptivity on flat plate with blunt leading edge due to acoustic disturbance
TL;DR: In this article, the acoustic receptivity of the leading edge of a flat plate with sharp and blunt leading edges was investigated for free-stream disturbances passing through a shock wave into the boundary layer.
Journal ArticleDOI
Hybrid POD-FFT analysis of nonlinear evolving coherent structures of DNS wavepacket in laminar-turbulent transition
Kean Lee Kang,Khoon Seng Yeo +1 more
TL;DR: In this paper, a hybrid Fast Fourier Transform (FFT) and Proper Orthogonal Decomposition (POD) is proposed to identify fundamental, subharmonic and Klebanoff modes in the flow.
Journal ArticleDOI
Interaction between Mack second mode and radiation mode in high-enthalpy boundary layers
Yu-Feng Han,Wei Cao +1 more
TL;DR: In this article , the authors studied the instabilities of high-enthalpy flat-plate boundary layers in thermochemical equilibrium conditions using linear stability theory (LST) and parabolized stability equations.
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.