Experiments on subharmonic resonance in a shear layer

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...

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Published in:Journal of fluid mechanics 1995-12, Vol.304, p.343-372
Main Authors: Husain, Hyder S., Hussain, Fazle
Format: Article
Language:English
Subjects:
Boundary layers
Exact sciences and technology
Flow measurement
Flow visualization
Fluid dynamics
Frequencies
Fundamental areas of phenomenology (including applications)
Hydrodynamic stability
Instability of shear flows
Laminar flows
Physics
Shear flow
Stability of laminar flows
Vortex flow
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description 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.
doi_str_mv 10.1017/S0022112095004459
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source Cambridge University Press:JISC Collections:Full Collection Digital Archives (STM and HSS) (218 titles)
subjects Boundary layers
Exact sciences and technology
Flow measurement
Flow visualization
Fluid dynamics
Frequencies
Fundamental areas of phenomenology (including applications)
Hydrodynamic stability
Instability of shear flows
Laminar flows
Physics
Shear flow
Stability of laminar flows
Vortex flow
title Experiments on subharmonic resonance in a shear layer
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