Excitation of instability waves
Abstract
A brief survey is given on artificial excitation of instability waves in parallel flows. There are basically two categories of unstable flows: (1) convectively unstable and (2) absolutely unstable flows. The perturbation level in convectively unstable flows, e.g., boundary layers and most free shear flows, depends on the excitation only. On the other hand, absolutely unstable flows, e.g., wake flows and hot jets, do maintain fluctuations independent of an exterior excitation. Finally, effects of nonparallel mean flow and of varying boundary conditons on instability wave excitation are discussed.
 Publication:

NASA STI/Recon Technical Report A
 Pub Date:
 December 1985
 Bibcode:
 1985STIA...8624585B
 Keywords:

 Computational Fluid Dynamics;
 Flow Stability;
 Parallel Flow;
 Wave Excitation;
 Boundary Layer Flow;
 Convective Flow;
 Jet Flow;
 Shear Flow;
 Wakes;
 Fluid Mechanics and Heat Transfer