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
A novel laminar kinetic energy model for the prediction of pretransitional velocity fluctuations and boundary layer transition
TL;DR: In this article, the laminar kinetic energy (LKE) concept is used to represent such fluctuations and a new LKE model is implemented in OpenFOAM within the Reynolds-Averaged Navier-Stokes framework.
Dissertation
Model-based control of transitional and turbulent wall-bounded shear flows
TL;DR: Jovanovic et al. as mentioned in this paper presented a Ph.D. dissertation on Electrical Engineering with an emphasis on the use of electrical engineering. Advisor: Professor Mihailo R. Jovanovic.
Journal ArticleDOI
Toward Cost-Effective Boundary Layer Transition Simulation with LES
Journal ArticleDOI
Effects of surface corrugation on the stability of a zero-pressure-gradient boundary layer
TL;DR: In this article, the effects of surface corrugation with small amplitude on the growth of Tollmien-Schlichting (T-S) waves were examined experimentally in a zero-pressure gradient boundary layer.
Journal ArticleDOI
Receptivity coefficients at excitation of cross-flow waves due to scattering of free-stream vortices on surface vibrations
TL;DR: In this article, a hot-wire anemometer was used to estimate the vibration-vortex receptivity coefficients as functions of the disturbance frequency, spanwise wavenumber and vortex offset parameter, which can be used for verification of various receptivity theories.
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.