Linear stability of differentially heated developing layers

Omar Knio, Xiyan Shi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Heterogeneous shear layers, characterized by the presence of a wake deficit and a Gaussian temperature profile, are considered. Unstable mode characteristics are interpreted in terms of a five-parameter set which describes the velocity ratio and the thicknesses and strengths of the wake component and temperature spike. In the absence of a wake deficit, the Kelvin-Helmholtz mode is inhibited as density gradients increase. Stabilization of this mode is weak (strong) when the density profile thickness is larger (smaller) than that of the shear layer. When a wake component is present, stabilization of the Kelvin-Helmholtz instability is no longer observed. In this case, the growth rate of unstable Kelvin-Helmholtz waves is found to be weakly sensitive to the presence of a heated region and to the details of the wake deficit.

Original languageEnglish (US)
Pages (from-to)822-832
Number of pages11
JournalAIAA journal
Volume33
Issue number5
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Aerospace Engineering

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