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
Characterization of low levels of turbulence generated by grids in the settling chamber of a laminar wind tunnel
TL;DR: In this article , a detailed hot-wire measurement was performed to characterize the properties of the turbulence generated by grids mounted in the settling chamber of the Laminar Wind Tunnel (LWT).
Numerical studies on receptivity and control of a three-dimensional boundary layer
TL;DR: In this paper, the surface roughness is modeled by applying direct numerical simulations (DNS) to the 3D boundary layer of a 3D plate and the surface smoothness is investigated.
Proceedings ArticleDOI
Non-linear Breakdown in Hypersonic Boundary Layer Transition Induced by Freestream Disturbances
Jia Lei,Xiaolin Zhong +1 more
TL;DR: In this paper, a new approach is presented to simulate the hypersonic boundary layer flow over a cone from laminar to the nonlinear breakdown using disturbance induced from the freestream waves.
Dissertation
Numerical simulation of wavepackets in a transitional boundary layer
TL;DR: In this article, the Navier-Stokes equations are cast in a novel velocity-vorticity formulation (see Davies and Carpenter (2001)) and discretized with a mixed pseudospectral and compact finite-difference scheme in space, and a three-level backward difference scheme in time.
Journal ArticleDOI
Laminar Boundary-Layer Response to Step Input by an Array of Plasma Actuators
TL;DR: In this article , a spanwise array of streamwise oriented plasma actuators are simulated in a laminar boundary layer to examine the flow response to a step change in the forcing.
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.