Closely Spaced Circular Cylinders in Cross-Flow and a Universal Wake Number

[+] Author and Article Information
David Sumner

Department of Mechanical Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, Saskatchewan, S7N 5A9 Canada

J. Fluids Eng 126(2), 245-249 (May 03, 2004) (5 pages) doi:10.1115/1.1667881 History: Received February 12, 2003; Revised September 30, 2003; Online May 03, 2004
Copyright © 2004 by ASME
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Staggered configuration of two circular cylinders of equal diameter, immersed in a steady mean cross-flow. Included is the force convention for the downstream cylinder.
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Single bluff-body behavior of two closely spaced staggered circular cylinders of equal diameter: (a) tandem, α=0 deg; (b) α=15 deg; (c) α=30 deg; (d) α=60 deg; (e) side-by-side, α=90 deg, R=shear layer reattachment, G=gap flow.
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Schematic of the experimental setup in the wind tunnel
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Experimental data for two closely spaced staggered cylinders, Re=5×104: (a) mean lift coefficient, uncertainty ±2%; (b) mean drag coefficient, uncertainty ±2%; (c) mean base pressure coefficient, uncertainty ±1%; (d) Strouhal number, uncertainty ±4% ▪, P/D=1.125; □, P/D=1.25; -----, single cylinder.
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Universal wake number data for two closely spaced staggered cylinders, Re=5×104: (a) Strouhal number, uncertainty ±4%; (b) universal Strouhal number, uncertainty ±4%; (c) Griffin number, uncertainty ±4%. □, Upstream cylinder data only; ▵, downstream cylinder data only; •, data for both cylinders together; -----, single cylinder.




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