Experiments on subharmonic resonance in a shear layer

Hyder S. Husain, Fazle Hussain

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

The subharmonic resonance phenomenon is studied using hot-wire measurements and flow visualization in an initially laminar shear layer forced with two-frequencies for various choices of the fundamental frequency/and its subharmonic//2 with controlled initial phase difference </>inbetween them. We explore the effects of the controlling parameters, namely: (i) forcing frequencies and their initial amplitudes, (ii) initial phase difference <j>in, and (iii) detuning (i.e. when the second forcing frequency is slightly different from//2). While several of our experimental observations support predictions based on weakly nonlinear theory, others do not. We explain our data in terms of vortex dynamics concepts.

Original languageEnglish
Pages (from-to)343-372
Number of pages30
JournalJournal of Fluid Mechanics
Volume304
DOIs
StatePublished - Dec 1995

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