Multi-Modal Forcing of the Turbulent Separated Shear Flow Past a Rib

[+] Author and Article Information
P. K. Panigrahi, S. Acharya

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803

J. Fluids Eng 126(1), 22-31 (Feb 19, 2004) (10 pages) doi:10.1115/1.1637634 History: Received April 30, 2002; Revised August 08, 2003; Online February 19, 2004
Copyright © 2004 by ASME
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Schematic of the experimental setup (top) and coordinate system of the rib (bottom)
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Schematic of the flow excitation arrangement
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The power spectrum of the streamwise u-velocity behind the rib turbulator for the unexcited flow
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The normalized streamwise fluctuation (top), normalized cross-stream fluctuation (middle), and normalized shear stress (bottom) profiles for the unexcited flow
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The streamwise shear layer growth ((Y0.9−Y0.7)/h) with its linear curve fit for the unexcited and excited flow
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The development of Y0.7 and Y0.9 locations and corresponding modal (fundamental and subharmonic) magnitude for the unexcited and excited flow
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The development of turbulent energy (both stream-wise and cross-stream) (top), coherent energy and its constituent modes (middle), and coherent and random shear stress (bottom) for the fundamental excitation, at Y0.7 and Y0.9 location
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The modal energy exchange with the mean flow at Y0.7 location for the excited flow
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The binary energy exchange between the fundamental and subharmonic mode at Y0.7 location for the fundamental-subharmonic excitation
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The development of phase jitter from modified HZFB method at Y0.7 location for the unexcited and excited flow
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The development of fundamental and subharmonic mode phase decorrelation for fundamental-subharmonic excitation (Δϕ=90°) using the pattern recognition approach at Y0.7 location. The symbols corresponds to the actual data and the solid lines correspond to the curve fit and the σ is the standard deviation (phase jitter).




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