Turbulent Flow Around Two Interfering Surface-Mounted Cubic Obstacles in Tandem Arrangement

[+] Author and Article Information
Robert J. Martinuzzi, Brian Havel

Advanced Fluid Mechanics Research Group, The Department of Mechanical and Materials Engineering, Faculty of Engineering Science, The University of Western Ontario, London, Ontario, Canada N6A 5B9

J. Fluids Eng 122(1), 24-31 (Nov 30, 1999) (8 pages) doi:10.1115/1.483222 History: Received December 14, 1998; Revised November 30, 1999
Copyright © 2000 by ASME
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Experimental geometry and nomenclature
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Summary of preliminary test results to determine the influence of Reynolds number. (a) Pressure coefficient (Cp=(P−P)/(1/2)ρU2;P is free-stream pressure) at three locations on the cube faces as a function of Reynolds number for S/H=1; (b) variation of PSDF peak frequency, f, with Reynolds number, for S/H=2 and 4, error bars indicate uncertainty.
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(a) Strouhal number (St) based on H versus S/H, uncertainty in St±0.0014, worst uncertainty in S/H±0.02; (b) Strouhal number based on S versus S/H. Plateau indicates lock-in region.
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Surface flow patterns obtained with an oil-film technique for (a) S/H=1; (b) S/H=2; (c) S/H=4. Letter labels refer to flow features: S: Primary separation line; A: high shear line associated with and upstream of the horseshoe vortex; A: high shear line due to vortices from windward corners of obstacle; B: re-separation line of back flow on top face; C: Secondary separation of backflow from wake at trailing edge of top face; D: Vorticity concentration; E,F: near-wake corner vortices; G: leading edge pigment accumulation; J: end of recirculation region in wake of second cube; R,S2,A2: reattachment zone, separation and attachment lines between cubes (S/H=4 only).
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Vector representation of the mean velocity components in the plane of symmetry z/H=0 for (a) S/H=1; (b) S/H=2; (c) S/H=4. Velocity uncertainty ±0.01U in free-stream and ±0.04U in the shear layer. Positioning uncertainty ±0.1 mm. Letter labels refer to legend in Fig. 4.
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Detailed view of the horseshoe vortex structure upstream of the first cube along the plane of symmetry z/H=0 showing multiple vortex structure for S/H=2: (a) vector representation of mean velocity field, uncertainties same as in Fig. 5; (b) smoke visualization. Letter labels refer to legend in Fig. 4.
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Detailed view of mean velocity vector field over the top face of the upstream cube along z/H=0 for case S/H=2. Letter labels refer to legend in Fig. 4. Uncertainties same as in Fig. 5.
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Velocity vector representation in plane normal to the flow for cube spacing S/H=1. (a) plane x/H=3.5 (half-way between cubes); ψ=−2 deg and (b) plane x/H=6 (H downstream of the second cube); ψ=4 deg. ψ is the perspective (view) angle rotation about the y-axis. The view angle was selected to be approximately parallel to the mean vorticity vector of the horseshoe vortex (HSV) extension and thus facilitate its identification. Letter labels refer to legend in Fig. 4. Uncertainties same as in Fig. 5.
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Isoline contour for Reynolds normal stresses: (a) u′2,S/H=1; (b) v′2,S/H=1; (c) u′2,S/H=4; (d) v′2,S/H=4. The Reynolds stresses are shown nondimensionalized with U2. Uncertainties are 0.002U2 and 0.006U2 in the free-flow and shear-layer, respectively.
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Dye-injection visualization for S/H=4 with laser light-sheet illumination along the plane of symmetry, z/H=0. Horseshoe vortices at the base of the first cube and the second cube are visualized.




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