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Research Papers: Fluid-Structure Interaction

Effect of a Flexible Wall on a Reattaching Turbulent Shear Layer

[+] Author and Article Information
Alexey Velikorodny

Department of Mechanical Engineering, University of Victoria, Victoria, BC V8W 2Y2, Canada

Graham Duck

 Honeywell Process Solutions, Vancouver, BC V7J 3S4, Canada

Peter Oshkai1

Department of Mechanical Engineering, University of Victoria, Victoria BC V8W 2Y2, Canadaposhkai@uvic.ca

1

Corresponding author.

J. Pressure Vessel Technol 132(4), 041303 (Jul 21, 2010) (9 pages) doi:10.1115/1.4001948 History: Received November 05, 2009; Revised June 07, 2010; Published July 21, 2010; Online July 21, 2010

Digital particle image velocimetry was applied to investigate turbulent flow of air between a flexible wall and a rigid surface containing a backward-facing step (BFS). The inflow condition corresponded to a Coanda jet issuing from a nozzle that was located upstream of the BFS. The flexible wall was represented by a sheet of paper under tension that was positioned above the BFS. Two additional configurations, which involved the BFS without the flexible wall and the BFS in proximity to an inclined rigid upper wall, were considered in this study. In all three cases, the flow fields were characterized in terms of patterns of time-averaged velocity, out-of-plane vorticity, streamline topology, and turbulence statistics. High-speed photography and unsteady pressure measurements were employed to characterize the flow-induced deformation of the flexible wall and the flow oscillations. The profile of the paper sheet could be approximated by linear segments, which, in conjunction with the rigid surface that contained the BFS, formed a diverging channel configuration. Confinement of the incoming flow by the flexible wall delayed flow reattachment to the rigid bottom surface downstream of the BFS. Patterns of turbulence statistics in the presence of the flexible wall shared qualitative similarity with the corresponding parameters of diverging channel flows as well as classical Couette–Poiseuille flows.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the air clamp apparatus

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Figure 2

Schematic of the experimental system

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Figure 3

Side and top view of the rigid wall configuration

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Figure 4

Profile of the paper sheet

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Figure 5

Time-averaged velocity profiles corresponding to case 1 (top), case 2 (middle), and case 3 (bottom)

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Figure 6

Time-averaged streamlines corresponding to case 1 (top), case 2 (middle), and case 3 (bottom)

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Figure 7

Time-averaged vorticity corresponding to case 1 (top), case 2 (middle), and case 3 (bottom)

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Figure 8

Nondimensional root-mean-square of the streamwise velocity fluctuation corresponding to case 1 (top), case 2 (middle), and case 3 (bottom)

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Figure 9

Nondimensional root-mean-square of the transverse velocity fluctuation corresponding to case 1 (top), case 2 (middle), and case 3 (bottom)

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Figure 10

Nondimensional Reynolds stress corresponding to case 1 (top), case 2 (middle) and case 3 (bottom)

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Figure 11

Nondimensional turbulent kinetic energy production corresponding to case 1 (top), case 2 (middle), and case 3 (bottom)

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Figure 12

Nondimensional turbulent kinetic energy dissipation corresponding to case 1 (top), case 2 (middle), and case 3 (bottom)

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Figure 13

Distribution of static pressure corresponding to case 3

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Figure 14

Spectrum of the unsteady pressure downstream of the BFS corresponding to case 3

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