Journal ArticleDOI
A note on the relation between temporally-increasing and spatially-increasing disturbances in hydrodynamic stability
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In this paper, the frequency and amplification rates for a disturbance growing with respect to time are compared with those of a spatially growing wave having the same wave number, and it is shown that the frequencies are equal to a high order of approximation.Abstract:
The frequency and amplification rates for a disturbance growing with respect to time are compared with those of a spatially-growing wave having the same wave-number. For small rates of amplification it is shown that the frequencies are equal to a high order of approximation, and that the spatial growth is related to the time growth by the group velocity.read more
Citations
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Proceedings ArticleDOI
Development of a system for transition characterization
TL;DR: By using artificial, intermittently laminar/turbulent signals, in conjunction with trajectory simulation, it becomes possible to conduct algorithm development which is independent of, and in advance of, sensor buildup.
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The Nonlinear Evolution of Swirling Jets
James E. Martin,Eckart Meiburg +1 more
TL;DR: In this paper, the authors investigate the mechanisms of vorticity concentration, reorientation and stretching in a swirling jet, whose dynamics is dominated by the competition of a Kelvin-Helmholtz-type vortex sheet instability and a centrifugal Rayleigh instability.
Proceedings ArticleDOI
Direct Numerical Simulation of Transition Control via Local Dynamic Surface Modification
TL;DR: In this article, direct numerical simulations were carried out in order to reproduce the generation and control of transition on a flat plate by means of local dynamic surface modification, and the configuration and fl...
References
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Journal ArticleDOI
Calculated Amplified Oscillations in the Plane Poiseuille and Blasius Flows
Journal ArticleDOI
On spatially-growing finite disturbances in plane Poiseuille flow
TL;DR: In this article, the Navier-Stokes equations are represented by finite disturbances in plane Poiseuille flow which vary with distance parallel to the bounding walls, and these solutions are based on infinitesimal disturbances which vary exponentially with distance (upstream or downstream) instead of with time.