Experiments on subharmonic resonance in a shear layer

Hyder S. Husain, Fazle Hussain

Research output: Contribution to journalArticle

49 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 f and its subharmonic f/2 with controlled initial phase difference φin between them. We explore the effects of the controlling parameters, namely: (i) forcing frequencies and their initial amplitudes, (ii) initial phase difference φin, and (iii) detuning (i.e. when the second forcing frequency is slightly different from f/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 (US)
Pages (from-to)343-372
Number of pages30
JournalJournal of Fluid Mechanics
Volume304
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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